㻌
㻌◊✲Ⓨ⾲せ᪨㻌㻌䠕᭶䠍䠏᪥䠄ᅵ䠅㻌㻌
3A01䡚3A17㻌 A ఍ሙ㻌
3B01䡚3B16㻌 B ఍ሙ㻌㻌ᾮయࢩࣥࢳ࣮ࣞࢩࣙࣥ

3A01

ᐃࢆ⏝࠸ࡓᾏỈ୰ࡢᨺᑕᛶ Sr ㎿㏿ศᯒࡢ᳨ウ1㔠ἑ኱㝔⮬↛ ࠊ㔠ἑ኱⌮ᕤ 2 ‫ۑ‬Ώ㎶Ⰻ♸ ࠊୖᮡṇᶞ 2ࠊ㓇஭ᾈ❶ 2ࠊᶓᒣ᫂ᙪ 2࠙ࡣࡌࡵ࡟ࠚ
ࠚࢫࢺࣟࣥࢳ࣒࢘ 90 (90Sr) ࡣඛࡢ⚟ᓥ➨୍ཎᏊຊⓎ㟁ᡤ஦ᨾ࡟࠾࠸࡚ࠊࡑࡢᨺฟᣲື
࠿ࡽ㝣ᇦ࡬ࡢᙳ㡪ࡣᑡ࡞࠿ࡗࡓࡀࠊ෭༷Ỉ࡟⁐ゎࡋࡓࡶࡢࡀởᰁỈ࡜࡞ࡾࠊᆅୗ࡬ࡢ₃࠼࠸࡜ᾏὒ࡬ࡢᨺฟࡀ⥆࠸࡚࠸ࡿࠋ⌧ᅾࠊᾏỈ୰ࡢ 90Sr ࡢศᯒ࡟ࡣᩥ㒊⛉Ꮫ┬ࡢᨺᑕ⬟ ᐃἲ㸦Ⓨ↮◪㓟ἲ㸧ࡀ⏝࠸ࡽࢀ࡚࠸ࡿࡀࠊ༴㝤࡛ᡭ㡰ࡀከࡃ㎿㏿ศᯒ࡜࠸࠺Ⅼ࡟࠾࠸࡚ࡣᨵၿࡢవᆅࡀ࠶ࡿࠋᨺ
ᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢ㎿㏿ᐃ㔞ἲ࡟ࡣࠊSr ࢆ⢭〇ศ㞳ࡍࡿ᪉ἲ࡜ 90Sr ࡢᏊᏞ᰾✀ 90Y ࢆ⢭〇ศ㞳ࡍࡿ᪉ἲࡀ࠶ࡿࠋࡑࡇ࡛ᮏ◊✲࡛ࡣࠊSr Rad-disk ࢆ⏝࠸ࡓ Sr ࡢ⃰⦰ἲࠊཬࡧ 90Y ࡢỿẊ⃰⦰ἲࡢᨵၿࢆヨࡳࡓࠋࡲࡓࠊ ᐃἲ࡜ࡋ࡚ᾮయࢩࣥࢳ࣮ࣞࢩࣙࣥ(LSC) ᐃἲ࡟ࡼࡾࠊࢳ࢙ࣞࣥࢥࣇග
ᐃἲཬࡧᢳฟࢩࣥࢳ࣮ࣞࢱࢆ⏝࠸ࡿ᪉ἲࢆ᳨ウࡋࡓࠋ

࠙ᐇ㦂ࠚ
ࠚ

ᾏỈヨᩱ 1Lࢡ࢚ࣥ㓟஧࢔ࣥࣔࢽ࣒࢘

(a) Sr Rad-Disk ࢆ⏝࠸ࡓศ㞳࣭⢭〇ἲࣜࣥ㓟஧Ỉ⣲࢔ࣥࣔࢽ࣒࢘
85
Sr ࢺ࣮ࣞࢧ࣮⁐ᾮ࢔ࣥࣔࢽ࢔Ỉ

ᾏỈ୰࡛୺࡟ᐃ㔞ࡢጉᐖ࡜࡞ࡿ Mg ࡜ Ca ࡢศ㞳ࡣࠊᅗ 1 ࡢࡼ࠺࡞ศ㞳ࢫ࣮࣒࢟࡟ࡼࡗࡓࠋSr ࡢᣲືࡣ 85Sr ࢺ࣮ࣞࢧ࣮(γ ⥺pH 7.5㹼8.0514keV)ࢆ⏝࠸࡚☜ㄆࡋࡓࠋࢡ࢚ࣥ㓟ῧຍ࡜ pH ࡢኚ໬࡟ࡼࡾࠊ

ࢁ㐣Ca ࡜ Sr ࢆ MgࠊNaࠊK ࡞࡝࠿ࡽศ㞳ࡋࡓࠋSr ࡢ⢭〇࡟ࡣࠊSrࢆ㑅ᢥⓗ࡟ᤕ㞟࡛ࡁࡿ Sr Rad Disk ࢆ⏝࠸ࠊCa ࠿ࡽศ㞳ࡋࡓࠋ(b) 90Y ࡢࣜࣥ㓟࢖ࢵࢺ࣒ࣜ࢘ඹỿศ㞳࡜ DDTC ⢭〇ἲ Y ࡣᾏỈ࡟࡯࡜ࢇ࡝ྵࡲࢀ࡚࠾ࡽࡎࠊࡑࡢỈ㓟໬≀ࡸࣜࣥ㓟ሷࡣỈ࡟୙⁐࡛࠶ࡿࠋࡇࢀࡽࡢᛶ㉁ࢆࡶ࡜࡟ Y ᢸయ࡟ᨺᑕᛶ Yࢆඹỿ⃰⦰ࡍࡿࠋY ࡢ⢭〇ࡣ ᐃࢆጉᐖࡍࡿኳ↛ᨺᑕᛶ᰾✀㸦U,Th, Po, Pb㸧ࢆ㝖ཤࡍࡿࡓࡵࠊDDTC ⁐፹ᢳฟࢆ⾜ࡗࡓࠋ(c) ᾮయࢩࣥࢳ࣮ࣞࢩࣙࣥ ᐃἲࢁᾮỿẊỈ㓟໬ࢼࢺ࣒ࣜ࢘

pH 10㹼
ࢁ㐣

ỿẊ

ࢁᾮ
2M ◪㓟

⁐ゎᾮ

ᐃ࡟࠾࠸࡚ࠊHDEHP ࢆ⏝࠸ࡓᢳฟࢩࣥࢳ࣮ࣞࢱ࡟ࡼࡾ Sr

90

࡜ Y ࢆᢳฟ ᐃࡍࡿ᮲௳࡜ Y ࡢࡳࢆᢳฟ ᐃࡍࡿ᮲௳ࢆ᳨ウ

90ࡋࡓࠋࡲࡓࠊ Y ࡢ ᐃ࡟ࡘ࠸࡚ࡣࢳ࢙ࣞࣥࢥࣇග ᐃ࡟ࡼࡗࡓࠋ
࠙⤖ᯝ࡜⪃ᐹࠚ
ࠚ

0.05M
EDTA㺃4Na

Sr Rad

Ca

Disk

Sr

ᅗ 1 ศ㞳ࢫ࣮࣒࢟(a) ᾏỈ࡟ Sr-Rad disk ࡣ㐺⏝࡛ࡁ࡞࠸࡜ࡉࢀ࡚࠸ࡓࡀࠊඹᏑሷࢆࣜࣥ㓟ሷỿẊἲ࡟ࡼࡾ㝖ཤࡍࡿࡇ࡜࡛㐺⏝ྍ⬟࡜࡞ࡗࡓࠋࡓࡔࡋࠊᾏỈࡢヨᩱ㔞ࡣࠊ஺᥮ᐜ㔞ࡢไ㝈࠿ࡽ㸯L ௨ୗ࡟ไ㝈ࡉࢀࡓࠋᅗ 1 ࡢศ㞳ࢫ࣮࣒࢟࡟ࡼࡿ 85Sr ࡢᅇ཰⋡ࡣࠊ84%ࡀᚓࡽࢀࠊศ㞳᫬㛫ࡣ⣙ 3.5 ᫬㛫࡛࠶ࡗࡓࠋ(b) Y ศ㞳ἲ࡛ࡣࠊඹᏑࡍࡿኳ↛ࡢᨺᑕᛶ᰾✀ࢆ DDTC ⁐፹࡟ࡼࡾ㝖ཤࡍࡿࡇ࡜࡛ࠊ㎿㏿໬ࢆᅗࡿࡇ࡜ࡀ࡛ࡁࡓࠋ(c) Sr ࡜ Y ࡢᘚู ᐃ࡟ᢳฟࢩࣥࢳ࣮ࣞࢱࢆ⏝࠸ࡿࡇ࡜ࢆヨࡳࡓࠋᢳฟỈᒙࡢᾮᛶࢆኚ໬ࡉࡏࡿ
ࡇ࡜࡛ Sr ࡜ Y ࡢᢳฟᣲືࡀኚ໬ࡍࡿࡇ࡜ࡀ☜ㄆࡉࢀࠊᘚู ᐃࡀྍ⬟࡛࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ

Examination of the rapid analysis of radioactive Sr isotopes in seawater using liquid
scintillation counting
WATANABE, R., UESUGI, M., SAKAI, H., YOKOYAMA, A.

- 83 -

3A02ᅛ┦ᢳฟἲࢆ⏝࠸ࡓỈヨᩱ୰ࡢᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢ⡆᫆ᐃἲϨ‫⟪ۑ‬㍯ࡣࡿ࠿ ࠊຍ⸨⤖ⰼ ࠊ⥴᪉Ⰻ⮳ ឿᜨ኱Ꮫ࣭࢔࢖ࢯࢺ࣮ࣉ ࠊ᪥❧࢔࣓ࣟ࢝ࢹ࢕࢝ࣝ ᰴ ࠊྡ኱㝔་  䛆⥴ゝ䛇㻌 ⎔ቃヨᩱ୰ࡢᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢศᯒ࡟ࡣࠊ࢖࢜ࣥ஺᥮ἲࠊⓎ↮◪㓟ἲࠊࢩࣗ࢘㓟ሷἲࡀ౑ࢃࢀ࡚࠸ࡿࠋࡇࢀࡽࡢ᪉ἲࡣࠊᡭ㡰ࡀ↹㞧࡛໬Ꮫศ㞳᧯స࡟᫬㛫ࡀ࠿࠿ࡾࠊ๻ẘ≀ࡢ౑⏝ࡀᚲ㡲࡛࠶ࡿࠋᡃࠎࡣᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢᏳ඲࠿ࡘ⡆࣭᫆㎿㏿࡞ศᯒἲࡢ㛤Ⓨࢆ┠ⓗ࡜ࡋ࡚ࠊᅛయᢳฟศ㞳๣ࢆ⏝࠸ࡓ Analig Sr-01 (IBC Advanced Technologies, Inc.) ࣒࢝ࣛࢆỈヨᩱ࡬㐺⏝ࡋࠊྠᵝࡢศ㞳๣ࢆ⏝࠸ࡓ EmporeTM Sr RadDisk (Sumitomo 3M Ltd.) ࡜ẚ㍑ࡋࡓࠋ
䛆ᐇ㦂䛇㻌
 90Sr ࢆࢫࣃ࢖ࢡࡋࡓỈヨᩱ࡟࢝ࣝࢩ࣒࢘ᢸ

Prepared solution (equivalent to sea water 1L)
1M-NaOH ca. 12 ml pH>10
Na2CO3 10g
Mixయࠊࢫࢺࣟࣥࢳ࣒࢘ᢸయࢆຍ࠼࡚ᶍᨃヨᩱࢆㄪ〇ࡋࡓࠋࢫࢺࣟࣥࢳ࣒࢘ࡢศ㞳⃰⦰࡟࠾ࡅHeat 80˚C, 1hࡿ࢝ࣝࢩ࣒࢘࡟ࡼࡿᙳ㡪ࢆㄪ࡭ࡿࡓࡵࠊ࢝ࣝ

Leave to coolࢩ࣒࢘⃰ᗘࡢ␗࡞ࡿヨᩱࢆసᡂࡋࡓࠋFig.1 ࡟

Keep stationary at 1 night໬Ꮫศ㞳᧯సࢆ♧ࡍࠋᾏỈ 1L ࡟┦ᙜࡍࡿヨᩱ

Filteration
Wash with H 2O

⁐ᾮࢆ NaOH ࡟ࡼࡾ pH>10 ࡢ࢔ࣝ࢝ࣜᛶ࡜ࡋࠊ
Ⅳ㓟࢝ࣝࢩ࣒࢘ࢆỿẊࡉࡏࡓࠋỿẊࢆ⁐ゎࡋ[precipitate][supernatant]
Dissolve with 8M-HNO3
Adjust to 3M-HNO3
Wash with 2M-HNO3 10ml

2㹼3M HNO3 ┦ᙜࡢ⁐ᾮ⣙ 35ml ࡟ㄪ〇ࡋ࡚ࠊAnalig Sr-1 ࣒࢝ࣛ࠶ࡿ࠸ࡣ EmporeTM RadDisk
࡟㏻ࡋࠊࢫࢺࣟࣥࢳ࣒࢘ࢆ྾╔ࡉࡏࡓࠋ྾╔Sample Solution ca. 35 mlࡋࡓࡲࡲࡢ≧ែ࡛ࠊ࣒࢝ࣛ୰ࡢ 90Sr ࡜ 90Y ࢆ

Wash with H 2O

┤᥋ well ᆺ NaI (Horiba Ltd.) ࡛ィ ࡋࢫ࣌ࢡ1M-HNO3 20ml㽢2ࢺࣝศᯒࢆ⾜࡞ࡗࡓࠋࡑࡢᚋ 0.03% EDTA ⁐0.03% EDTA 20ml

AnaligSr-01
columndiscardEluateWashed solution
Eluateᾮ࡛ Analig Sr-1 ࣒࢝ࣛࡼࡾࢫࢺࣟࣥࢳ࣒࢘ࢆ
⁐㞳ࡋࡓࠋ⁐ฟᾮࡢ୍㒊ࢆ well ᆺ NaI ࡛ࠊࡲࡓ⁐ฟᾮ࠾ࡼࡧࢹ࢕ࢫࢡࢆᾮయࢩࣥࢳ࣮ࣞࢩ

Fig. 1 Procedure of Sr separation experiment by
Analig Sr-1

ࣙࣥ࢝࢘ࣥࢱ LSC-6100 (Hitachi Aloka MedicalLtd.) ࢆ⏝࠸࡚ᐃࡋࡓࠋ⣙㸱㐌㛫ᚋࡢ 90Sr̺90Y ࡀᨺᑕ໬Ꮫᖹ⾮࡟㐩ࡋࡓᚋࡢᐃ್࠿ࡽ 90Sr

ࢆᐃ㔞ࡋࠊ⁐ฟ⋡࠾ࡼࡧࠊ࣒࢝ࣛ࠶ࡿ࠸ࡣࢹ࢕ࢫࢡ࡬ࡢ྾╔⋡ࢆồࡵࡓࠋ䛆⤖ᯝ䛸⪃ᐹ䛇㻌 ᚑ᮶ࡢ᪉ἲ࡛ࡣ໬Ꮫศ㞳᧯స࡟⣙㸰㐌㛫࠿࠿ࡗ࡚࠸ࡓࡀࠊࡇࡢ᪉ἲ࡛໬Ꮫศ㞳᧯స࡟せࡋࡓ᫬㛫ࡣ㸰᪥㛫࡛࠶ࡗࡓࠋヨᩱ୰ࡢ࢝ࣝࢩ࣒࢘㔞 1-5g㸦ヨᩱ 1L ࡟ᑐࡋ 0.1-0.5%㸧ࡢ⠊ᅖ࡛ࠊ
Analig Sr-1 ࣒࢝ࣛ࡬ࡢࢫࢺࣟࣥࢳ࣒࢘྾╔⋡ࡣ 77%࡛࠶ࡗࡓࠋ ࡇࡢ᪉ἲࡣᾏỈヨᩱࡢࢫࢡ࣮ࣜࢽࣥࢢศᯒ࡟㐺⏝ྍ⬟࡛࠶ࡿࠋ౑⏝ࡋࡓ࣒࢝ࣛࡣ෌฼⏝࡛ࡁࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡓࠋࡇࡢ᪉ἲ࡟ࡼࡾᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢ⡆᫆ᐃ㔞ࡀྍ⬟࡜࡞ࡗࡓࠋ
Rapid determination of radiostrontium in water by solid extraction technique: part 1
MINOWA, H., KATO, Y., OGATA, Y.

- 84 -

3A03

ᅛ┦ᢳฟἲࢆ⏝࠸ࡓỈヨᩱ୰ࡢᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢ⡆᫆ᐃἲϩ‫ۑ‬ຍ⸨⤖ⰼ ࠊ⟪㍯ࡣࡿ࠿ ࠊ⥴᪉Ⰻ⮳ ᪥❧࢔࣓ࣟ࢝ࢹ࢕࢝ࣝ ᰴ ࠊឿᜨ኱Ꮫ࣭࢔࢖ࢯࢺ࣮ࣉ ࠊྡ኱㝔་  䛆⥴ゝ䛇 ⎔ቃヨᩱ୰ࡢᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢศᯒ࡟ࡣࠊ࢖࢜ࣥ஺᥮ἲࠊⓎ↮◪㓟ἲࠊࢩࣗ࢘㓟ሷἲࡀ౑ࢃࢀ࡚࠸ࡿࠋࡇࢀࡽࡢ᪉ἲࡣࠊᡭ㡰ࡀ↹㞧࡛໬Ꮫศ㞳᧯స࡟᫬㛫ࡀ࠿࠿ࡾࠊ๻ẘ≀ࡢ౑⏝ࡀᚲ㡲࡛࠶ࡿࠋᡃࠎࡣᨺᑕᛶࢫࢺࣟࣥࢳ࣒࢘ࡢᏳ඲࠿ࡘ⡆࣭᫆㎿㏿࡞ศᯒἲࡢ㛤Ⓨࢆ┠ⓗ࡜ࡋ࡚ࠊᅛయᢳฟศ㞳๣ࢆ⏝࠸ࡓ Analig Sr-01 (IBC Advanced Technologies, Inc.) ࣒࢝ࣛࢆỈヨᩱ࡬㐺⏝ࡋࠊྠᵝࡢศ㞳๣ࢆ⏝࠸ࡓ EmporeTM Sr RadDisk (ఫ཭ࢫ࣮࢚࣒ࣜ) ࡜ẚ㍑ࡋࡓࠋ๓ሗ࡟࡚ᮏศᯒἲࡢ᭷⏝ᛶ࡟ࡘ࠸࡚ሗ࿌ࡋࠊᮏሗ࡛ࡣ ᐃἲ࡟ࡘ࠸࡚ሗ࿌ࡍࡿࠋ䛆ᐇ㦂䛇㻌 ๓ሗ࡜ྠᵝࡢᡭ㡰࡟࡚ 90Sr ࢆࢫࣃ࢖ࢡࡋࡓᶍᨃỈヨᩱࢆㄪ〇ࡋࡓࠋᾏỈ 1L ࡟┦ᙜࡍࡿヨᩱ⁐ᾮ࠿ࡽࢫࢺࣟࣥࢳ࣒࢘ࢆỿẊࡉࡏࡓᚋࠊỿẊࢆ⁐ゎࡋ 2㹼3M HNO3 ┦ᙜࡢ⁐ᾮ⣙ 35ml ࡟ㄪ〇ࡋ࡚ࠊAnalig Sr-1 ࣒࢝ࣛ࠶ࡿ࠸ࡣ EmporeTM RadDisk ࡟㏻ࡋࠊࢫࢺࣟࣥࢳ࣒࢘ࢆ྾╔ࡉࡏࡓࠋᐃ᪉ἲ࡜ࡋ࡚ࡣࠊ࣒࢝ࣛࡣ྾╔ࡋࡓࡲࡲࡢ≧ែ࡛ࠊ90Sr ࢆ┤᥋ well ᆺ NaI ᳨ฟჾ(Horiba)࡛ィࡋࡓࠋࡲࡓࠊ90Sr-90Y ᨺᑕᖹ⾮ᚋࠊEDTA ⁐ᾮ࡛ࠊ࣒࢝ࣛࡼࡾ Sr ࢆ⁐ฟࡋࠊ⁐ฟᾮ 1mlࢆ࣒࢝ࣛࢆྠᵝࡢᙧ≧ࡢὀᑕ⟄࡟⛣ࡋ well ᆺ NaI ࡛ィࡋࡓࠋ⁐ฟᾮࡢ࠺ࡕ 4ml ࢆ 16ml ࡢᾮయࢩࣥࢳ࣮ࣞࢱ࡟ΰ࿴ࡉࡏᾮయࢩࣥࢳ࣮ࣞࢩࣙࣥ࢝࢘ࣥࢱ LSC-6100(Hitachi Aloka Medical)࡟࡚ィ ࡋࡓࠋRadDisk ࡣࠊ┤᥋ 20ml ࡢᾮయࢩࣥࢳ࣮ࣞࢱ࡟ΰ࿴ࡉࡏ LSC-6100 ࡟࡚ィ ࡋࡑࢀࡒࢀࢫ࣌ࢡࢺࣝศᯒࢆ⾜࡞ࡗࡓࠋ䛆⤖ᯝ䛸⪃ᐹ䛇㻌 ᚑ᮶ࡢ᪉ἲ࡛ࡣ໬Ꮫศ㞳᧯స࡟⣙㸰㐌㛫࠿࠿ࡗ࡚࠸ࡓࡀࠊࡇࡢ᪉ἲ࡛໬Ꮫศ㞳᧯స࡟せࡋࡓ᫬㛫ࡣ㸰᪥㛫࡛࠶ࡾ⡆࣭᫆㎿㏿࡞ศᯒἲࡀྍ⬟࡜࡞ࡗࡓ㸦๓ሗ㸧ࠋ Fig.1 ࡟ well ᆺ NaI
᳨ฟჾࠊFig.2 ࡟ LSC-6100 ࡛ࡢࢫ࣌ࢡࢺࣝศ
ᯒ⤖ᯝࢆ♧ࡍࠋAnalig Sr-1 ࣒࢝ࣛࡣᨺᑕᖹ⾮࡟㐩ࡋࡓᚋࠊwell ᆺ NaI ᳨ฟჾ࡛┤᥋ 90Sr ࢆᐃ㔞ࡍࡿࡇ࡜ࡀ࡛ࡁࡓ(Fig.1)ࠋࡲࡓࠊEDTA ࢆ⏝࠸ࡓ⁐ฟᾮࡢ ᐃ࡟ࡣࠊwell ᆺ NaIࠊLSC-6100
࡜ ࡶ ࡟ ฼ ⏝ ྍ ⬟ ࡛ ࠶ ࡗ ࡓ ࠋ EmporeTM Sr
RadDisk ࡢሙྜࡣࠊᾮయࢩࣥࢳ࣮ࣞࢱ࡜┤᥋ΰ࿴ࡋࠊຠ⋡ࢺ࣮ࣞࢧἲࢆ⏝࠸࡚ LSC-6100 ࢆ⏝࠸࡚ ᐃࡍࡿࡇ࡜࡛ࠊᨺᑕᖹ⾮ࢆᚅࡘࡇ࡜࡞
ࡃ 90Sr ࢆ㎿㏿࡟ᐃ㔞ࢆ⾜࠺ࡇ࡜ࡀ࡛ࡁࡓࠋ
Analig Sr-1 ࣒࡛࢝ࣛࡣࠊ ᐃࡲ࡛࡟᫬㛫ࢆせࡍࡿࡀࠊ⧞ࡾ㏉ࡋ౑⏝ྍ⬟࡞ࡇ࡜࠿ࡽᾏỈヨᩱࡢ᭷⏝࡞ࢫࢡ࣮ࣜࢽࣥࢢ᪉ἲࡢ୍ࡘ࡜ゝ࠼ࡿࠋ㻌

Fig.1 well ᆺ NaI ࢫ࣌ࢡࢺࣝ

Fig.2 LSC-6100 ࢫ࣌ࢡࢺࣝ

Rapid determination of radiostrontium in water by solid extraction technique: part 2
KATO, Y., MINOWA, H., OGATA, Y.

- 85 -

3A04!"#$%&'( )*+,- ./01#$.234!!"#$%"!!&'(")*"+"#,-."!$/%#&0"'12#$%345()&6"!'7()**8++,,#-$-!9 137 :..;7<!9 90 /%3=>?@8A/#BC0
1DE02$FG3HI(-4!1(46 ALPS %JK#-/"%(HI&65L/6M1NO(PQ2R73/5,42$# 56S/76$T&'7(UV1*87( 1 W&9+"S/X
0#E8'!7"Y:Z%;02%0&"[25\<9$-!9"..;7<!9%S/&=2%0/]:&>E02 1)2)$#<#^;42?@X/A_2&;2/B0-4"C`8aD2bc/#=0$E#6d 1 8e4+F1<&=;>Z';?Y@7
fHFCG( 1 g&9+"h_2<W;2/i0 HFC-43-10meefj
Y.kZ XFG%?@X"OcPhCMPO %S/X042!'7(56S/%]:#E02 3)$,%!&6d 2 8e48'!7"Y:
ZfDCH18C6G%S/X"HFC %?@X0#E35\<9HZ?l$TmI"HZ?lAn$TmI(S/%J%1D-'o%]:42$
4 5KB6# 3p6$TmI%qL35\0#"UMp6 DCH18C6 J+Cd 3 8e4+F1rsVo/tu&=2S/X&92DY>Z';-3,6,9-.l'EF!7G?7-1,11-v[fPFTOUDAG"
H#(6 OcPhCMPO %5w#- HFCfjY.kZ XH"jY.kZ MCAG0#-$NI(
3p0UMp%Jx#"25K&O0F#-$3p($TmI(yL% ICP-AES M-6%3P
z{K&QN#"*|}O%~!#-$#&'o'# PFTOUDA- j Y . k Z XH  " H # ( 6
PFTOUDA-jY.kZ MCA &"Sr /S/&>-f" 1G$6#($(KB$:$mI(S/8W0EP(42$&%'# ,%!8J0E"jY.kZ%Q#E(&&D8(W#'M4$&GRS7>;;TU?ZfVG&('
1) R. A. Sachleben, et al., Sep. Sci. Technol., 32(1997)275.
2) K. K. Gupta, et al., Solvent Extr. Ion Exch., 21(2003)53.
3) T. YAMAMURA, et al., Journal of Nucl Sci and Tech, 47(2010)515.
Investigation of selective extraction of cesium and strontium by solvent extraction
NAGAI, M., SHIRASAKI, K., SAKAMOTO, K., YAMAMURA, T..

- 86 -

3A05

ࡘࡃࡤ࡜㣤⯓ᮧ኱Ẽ୰ࡢ⚟ᓥ➨୍ཎⓎ஦ᨾࡢᨺᑕᛶ᰾✀ᅜ⎔◊ ࠊࡩࡃࡋࡲ෌⏕ࡢ఍ ࠊ㧗࢚ࢿ◊  ‫ۑ‬ᅵ஭ጁᏊ ࠊ㧗ᮌ㯞⾰ ࠊ⏣୰ᩔ ࠊⳢ㔝᐀ኵ ࠊᅵჾᒇ⏤⣖Ꮚ ࠊᱝᮏ࿴⩏ ࠙⥴ゝࠚᮾ᪥ᮏ኱㟈⅏ᚋࡢ⚟ᓥ➨୍ཎᏊຊⓎ㟁ᡤࡢ஦ᨾ࡟ࡼࡾࠊ኱㔞ࡢᨺᑕᛶ≀㉁ࡀ⎔ቃ୰࡟ᨺฟࡉࢀࡓࠋ
2011 ᖺ 3 ᭶ 12 ᪥ࡢ᪩ᮅࠊཎⓎ࠿ࡽᨺᑕᛶ᰾✀ࡢᨺฟࡀጞࡲࡗࡓࠋ୺࡞ᨺฟࡣ 3 ᭶ 15 ᪥࡜ 16 ᪥࡟㉳ࡁࡓࠋ⚟ᓥ➨୍ཎⓎ࠿ࡽ༡༡す⣙ 170km ࡢⲈᇛ┴ࡘࡃࡤᕷ࡟࠾࠸࡚ 2011 ᖺ 3 ᭶ 15 ᪥ࡼࡾ኱Ẽ࢚࢔ࣟࢰࣝ୰ࡢᨺ
ᑕᛶ᰾✀⃰ᗘࡢ ᐃࢆ㛤ጞࡋࡓ 1)ࠋ2012 ᖺ 3 ᭶࠿ࡽࡣ⚟ᓥ➨୍ཎⓎ࠿ࡽ໭す⣙ 30 ᩘ࣓࣮࢟ࣟࢺࣝࡢ⚟ᓥ┴┦㤿㒆㣤⯓ᮧࡢ㑊㞴ᣦ♧ゎ㝖‽ഛ༊ᇦ࡛ࡶࠊ኱Ẽ࢚࢔ࣟࢰࣝࡢᨺᑕ⬟ ᐃࢆ㛤ጞࡋࡓࠋᖐ㑏࡟ྥࡅ࡚ࠊ኱
Ẽ࢚࢔ࣟࢰࣝ୰ࡢ 137Csࠊ134Cs ⃰ᗘኚ໬࡜⢏ᚄศᕸཬࡧ࢚࢔ࣟࢰࣝᡂศࡢኚ໬ࢆࡘࡃࡤᕷࡢ኱Ẽ୰⃰ᗘ࡜ẚ
㍑ࡋ࡚ሗ࿌ࡍࡿࠋ࠙ᐇ㦂ࠚ኱Ẽヨᩱࡣ 2012 ᖺ 3 ᭶ 20 ᪥࠿ࡽబ㡲⁥࡟ࣁ࢖࣒࢚࣎ࣜ࢘࢔ࢧࣥࣉ࣮ࣛ
㸦HV-700F ࡲࡓࡣ HV-1000F,ᰘ⏣⛉Ꮫ㸧ࢆᆅୖ㸦㧗ࡉ 1.5m㸧࡟タ⨨ࡋࠊẖศ 500L ࡢὶ㏿࡛࠾ࡼࡑ 1 㐌㛫ẖ࡟ࣇ࢕ࣝࢱ࣮஺᥮ࢆ⾜ࡗࡓࠋࡲࡓࠊ2012 ᖺ 9 ᭶ 8 ᪥࠿ࡽࡣྠᶵ✀ࢆ㣤⯓ᮧᙺሙධཱྀ㸦ఀ୹ἑ㸧࡟ࡶタ⨨ࡋ࡚ࠊྠᵝࡢヨᩱ᥇ྲྀࢆ㛤ጞࡋࡓࠋ኱Ẽヨᩱࡣࠊ▼ⱥ⧄⥔ࢁ⣬㸦࢔ࢻࣂࣥࢸࢵࢡᮾὒ QR-100㸧ୖ࡟⢏Ꮚ≧≀㉁ࢆᤕ㞟ࡋࡓࠋ⢏ᚄูࡢ኱Ẽヨᩱࡣ 12 ẁࡢపᅽ࢔ࣥࢲ࣮ࢭࣥᆺࢧࣥࣉ࣮ࣛ㸦ᮾிࢲ࢖ࣞࢵࢡ㸪LP-20㸧࡟ࡼࡾࠊ2013 ᖺ 8 ᭶ 6 ᪥ࡼࡾࠊ඲㔞኱Ẽ᥇ྲྀ࡜ྠࡌሙᡤ㸦బ㡲⁥㸧࡛ᆅୖ࡟࡚ 4 ᅇ᥇ྲྀࡋࡓࠋ኱Ẽヨᩱ୰ࡢᨺᑕᛶ᰾✀ࡢᐃ㔞ࡣࠊᅜ⎔◊ࡢ」ᩘྎࡢ Ge ༙ᑟయ᳨ฟჾࢆ⏝࠸ࡓࠋᨺᑕᛶ᰾✀ ᐃᚋࡢࣇ࢕ࣝࢱ࣮ࡢ୍㒊ࡣỈᢳฟࢆ⾜࠸ࠊ࢖࢜ࣥࢡࣟ
࣐ࢺࢢࣛࣇ࢕࣮㸦Thermo Fisher Scientific:ICS-2000㸧࡟ࡼࡾỈ⁐ᛶ࢖࢜ࣥᡂศࡢ ᐃࢆ⾜ࡗࡓࠋࡘࡃࡤࡢ኱
Ẽヨᩱࡣ 2011 ᖺ 3 ᭶ 15 ᪥௨㝆ࠊࡘࡃࡤࡢᅜ❧⎔ቃ◊✲ᡤᩜᆅෆᘓ≀ᒇୖ㸦㧗ࡉ 10m㸧࡛ྠᵝࡢ᪉ἲ࡛ᤕ
㞟ࢆ⥅⥆ࡋ࡚࠸ࡿࠋ2011 ᖺ 7 ᭶௨㝆ࠊẖศ 200L ࡢὶ㏿࡛㸯㐌㛫ẖ࡟ࣇ࢕ࣝࢱ࣮ࡢ஺᥮ࢆ⾜ࡗࡓࠋᨺᑕᛶ᰾
✀ࡢᐃ㔞ࡣ㧗࢚ࢿ◊ࡢ Ge ༙ᑟయ᳨ฟჾ࡛⾜ࡗࡓࠋ࠙⤖ᯝ࣭⪃ᐹࠚᅗ 1 ࡟ࡘࡃࡤࡢ኱Ẽ୰ 137Csࠊ134Cs ⃰ᗘࡢኚ໬ࢆ♧ࡍࠋ஦ᨾ┤ᚋࡣ᭱኱ 8Bq m-3 ࡛࠶ࡗࡓࡀࠊ
134⌧ᅾࡣ 10-5Bq m-3 ⛬ᗘ࡛࠶ࡿࠋ
ᅗ 2 ࡟㣤⯓ᮧబ㡲࡜ఀ୹ἑ࡟࠾ࡅࡿ኱Ẽ୰ࡢ 137Csࠊ
Cs ⃰ᗘࡢኚ㑄ࢆ♧ࡍࠋబ㡲࡜ఀ୹ἑࡣࡘࡃࡤࡢ࠾ࡼࡑ 10 ಸࡢ⃰ᗘࡢ 10-4Bq m-3 ⛬ᗘ࡛ࠊྠࡌ⃰ᗘ⠊ᅖࡢኚືࢆ♧ࡋࡓࠋ2012 ᖺ 4᭶ึࡵ࡟బ㡲࡛㧗⃰ᗘࢆ♧ࡋࡓࠋࡇࢀࡣᐑᇛ┴୸᳃⏫ࡢ 2012 ᖺ 4 ᭶ึࡵࡢ 137Csࠊ134Cs ⃰ᗘࡢࣆ࣮ࢡ࡜ྠ
ᮇࡋ࡚࠸ࡿࠋ2013 ᖺ 3 ᭶࡟ࡶఀ୹ἑࡢ 137Csࠊ134Cs ⃰ᗘࡀ㧗ࡃ࡞ࡗࡓࡀࠊబ㡲࡛ࡣࣆ࣮ࢡࡣほ ࡉࢀ࡞࠿ࡗ
ࡓࠋ࢚࢔ࣟࢰࣝ୰ࡢỈ⁐ᛶ࢖࢜ࣥᡂศࡢ ᐃࢆ⾜ࡗࡓࠋ2013 ᖺ 3 ᭶ࡢᙺሙࡢ࢚࢔ࣟࢰࣝ࡟ࡣࢥࣥࢡ࣮ࣜࢺ
⏤᮶ࡢ Ca ࢖࢜ࣥࡢ⃰ᗘࡀ㧗࠿ࡗࡓࡓࡵࠊᙺሙ࿘㎶ࡢ㝖ᰁసᴗ࡟ࡼࡿᒁᡤⓗ࡞⌧㇟࡜ᛮࢃࢀࡿࠋ2013 ᖺ 8 ᭶࡟ࡶ୧ᆅⅬࡢ⃰ᗘୖ᪼ࡀ࠶ࡗࡓࠋࡇࡢ᫬ᮇࠊ⚟ᓥཎⓎ࡟࠾࠸࡚ࡀࢀࡁ᧔ཤ࡟
ࡼࡿᨺᑕᛶ Cs ࡢ㣕ᩓࡀ☜ㄆࡉࢀ࡚࠾ࡾࠊࡇࡢẼὶࡢ➃ࡀ㣤⯓
ᮧࢆ㏻㐣ࡋࡓࡓࡵ࡜⪃࠼ࡽࢀࡿࠋ137Csࠊ134Cs ࡢ⢏ᚄศᕸ ᐃ
࡛ࡣࠊ1.2μm ௨ୗࡢ⢏ᚄ࡟ࡣ᳨ฟࡉࢀ࡞࠿ࡗࡓࠋ   

ᅗ 1.ࡘࡃࡤࡢ኱Ẽ୰ 137Cs,134Cs ⃰ᗘ㸦2011 ᖺ 9 ᭶௨㝆ࢆ♧ࡍ㸧         ᅗ 2.㣤⯓ᮧబ㡲࡜ఀ୹ἑࡢ኱Ẽ୰ 137Cs,134Cs ⃰ᗘ1) Doi.,T, et al., J. Environ. Radioact. 122, 55-62, 2013.

Fukushima-derived radionuclides in the atmosphere observed in Tsukuba and Iitate
DOI, T.,TAKAGI, M., TANAKA, A., KANNO, M., DOKIYA, Y., MASUMOTO, K..

- 87 -

3A06!"#$%&'()*$+#,-./012345067!
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KOMA, Y.

- 88 -

3A07⚟ᓥ┴ෆࡢࢫࢠᯘ࡟࠾ࡅࡿ⾲ᒙᅵተࡢ≉ᛶ࡜ᨺᑕᛶࢭࢩ࣒࢘ศᕸ
ཎᏊຊᶵᵓ ‫▼ۑ‬஭ᗣ㞝㸪బࠎᮌ⚈ே㸪⳥ụ┤அ㸪Ώ㑔㈗ၿ㸪ᑠ⏣ዲ༤㸪
᪂㔛ᛅྐ

䛆⥴ゝ䛇
ཎᏊຊᶵᵓ䛷䛿䠈⚟ᓥ┴ෆ䛻䛚䛡䜛⌧ᆅㄪᰝ䝕䞊䝍䛻ᇶ䛵䛔䛶䠈ᒣᆅ᳃ᯘ䛛䜙䝎䝮⁀ụ䜔Ἑᕝ➼䜢㏻䛨䛶Ἑཱྀᇦ䠈᭦䛻䛿ἢᓊᇦ䜎䛷䛾ᨺᑕᛶ䝉䝅䜴䝮䠄Cs-134, 137䠗௨ୗ䠈ᨺᑕᛶ Cs䠅䛾⛣ື䜢ண 䛧䠈䛣䛾ᨺᑕᛶ Cs 䛾⛣ື䛻㉳ᅉ䛩䜛㝖ᰁ῭䜏䜶䝸䜰䛾⥺㔞⋡䛾ኚ໬䜔䠈⏕ά⏝Ỉ※䜈䛾ΰධ➼䛻ᑐ䛩䜛ᢏ⾡᝟ሗ䜔ᑐ⟇᱌➼䛾ᥦ᱌䜢┠ⓗ䛸䛧䛯䛂⚟ᓥ㛗ᮇ⎔ቃືែ◊✲䠄F-TRACE 䝥䝻䝆䜵䜽䝖䠅䛃䜢⾜䛳䛶䛔䜛䚹ᮏሗ䛷䛿䠈ྠ䝥䝻䝆䜵䜽䝖䛾᳃ᯘᇦ䜢ᑐ㇟䛸䛧䛯ㄪᰝ⤖ᯝ䛾୍㒊䜢ሗ࿌䛩䜛䚹᳃ᯘᇦ䛷䛿䠈ᶞᮌୖ㒊䛾ᯞⴥ䛻௜╔䛧䛶䛔䛯ᨺᑕᛶ Cs 䛿ⴠⴥⴠᯞ䜎䛯䛿㝆㞵䛻క䛖ᯘෆ㞵䠈ᶞ⓶⾲㠃䜢ὶ䜜䜛Ỉὶ䠄ᶞᖿὶ䠅䛻䜘䜚ᯘෆ䛾ᆅ⾲䜈㐠ᦙ䛥䜜䜛䛸⪃䛘䜙䜜䜛䚹ྠ䝥䝻䝆䜵䜽䝖䛻䜘䜛2013 - 2014 ᖺ䛾ㄪᰝ⤖ᯝ䛷䛿䠈ᯘෆ㞵䛻䛿ᨺᑕᛶ Cs 䛜䜋䛸䜣䛹᳨ฟ䛥䜜䛪䠈୍᪉䛷䠈ᶞᖿὶヨᩱ
䛻䛿 4.0 - 17.5 Bq L-1 䛾 Cs-137 䛜ྵ䜎䜜䜛஦䛜ሗ࿌䛥䜜䛶䛔䜛 1)䚹䛭䛣䛷䠈ᶞᖿ㏆ഐ䛻䛚䛡䜛ᅵተ䛾ᶞᖿὶ䛾ᙳ㡪䜢ㄪ䜉䜛䛯䜑䠈⚟ᓥ┴㜿Ṋ㝰ᒣᆅ䛾䝇䜼ᯘ䛻䛚䛔䛶⾲ᒙᅵተ䛻䛴䛔䛶䛾ㄪᰝ䜢⾜䛳䛯䚹䛆ㄪᰝ䞉ᐇ㦂䛇
䝇䜼❧ᮌ䛾࿘ᅖ 2 m 㽢 2 m ⠊ᅖ䜢 50 cm 䝯䝑䝅䝳䛷ศ๭䛧䠈NaI 䝃䞊䝧䜲䝯䞊䝍䛻䜘䜛 1 cm ⾲㠃⥺㔞⋡䛾 ᐃ䛸䛸䜒䛻䠈ⴠⴥⴠᯞ䛾ሁ✚ᒙ䠄䝸䝍䞊ᒙ䠅䛚䜘䜃῝ᗘ 0 - 5 cm 䛾㖔㉁ᅵተᒙ䜢᥇ྲྀ䛧䛯䚹᥇ྲྀ䛧䛯ᅵተ䛿㏦㢼ᆺᜏ ჾ䛻䜘䜚 40䉝䛷஝⇱ᚋ䠈pH䠄H2O䠅䜔㟁Ẽఏᑟ⋡䠄EC䠅➼䛾ᅵተ≉ᛶ䝕䞊䝍䛾ྲྀᚓ䛚䜘䜃 Ge ༙ᑟయ᳨ฟჾ䛻䜘䜛ᨺᑕᛶ Cs ⃰ᗘ䛾ศᯒ䜢ᐇ᪋䛧䛯䚹䛆⤖ᯝ䞉⪃ᐹ䛇ᅗ䛻⾲ᒙᅵተ䛾 pH䠄H2O䠅䛚䜘䜃ᅵተ୰䛾ᨺᑕᛶ Cs ⃰ᗘ䜢♧䛩䠄ᅗ୰ኸ䛾ⓑᅄゅ䛜䝇䜼❧ᮌ䠅䚹䝇䜼❧ᮌ㏆ഐ䛾ᅵተ䛿 pH䠄H2O䠅䛜ప䛟䠈≉䛻ప䛔㡿ᇦ䛻䛴䛔䛶䛿䠈㝆㞵᫬䛻ከ㔞䛾ᶞᖿὶ䛜┠ど䛷☜ㄆ䛥䜜䛯ᶞᖿ䛾᪉ゅ䛸୍⮴䛧䛯䚹䛣䜜䛿㓟ᛶᗘ䛾㧗䛔ᶞᖿὶ䠄pH 䡚 3.9䠅䛾ᙳ㡪䛻䜘䜚ᅵተ䛜㓟ᛶ໬䛧䛯䜒䛾䛸⪃䛘䜛䚹୍᪉䛷䠈䝇䜼❧ᮌ䛛䜙䛾㊥㞳䛸ᅵተ୰䛾ᨺᑕᛶ Cs ⃰ᗘ䛸䛾㛵ಀ䛻䛴䛔䛶䛿䠈❧ᮌ㏆ഐ䛷ప䛔ഴྥ䛜䛒䜛䜒䛾䛾䠈≉䛻ᅵተ pH䠄H2O䠅䛜ప䛔 2 ᆅⅬ䛻䛚䛔䛶䠈ᨺᑕᛶ Cs ⃰ᗘ䛜㧗䛔䛣䛸䛜䜟䛛䜚䠈䛣䜜䛿ᶞᖿὶ䛻ྵ䜎䜜䜛ᨺᑕᛶ Cs 䛾ᙳ㡪䛷䛒䜛䛸᥎ᐹ䛥䜜䜛䚹௒ᚋ䛿ᨺᑕᛶCs 䛾ศᕸ䛻䛴䛔䛶䠈ᯘෆ䛻䛚䛡䜛ึᮇᨺᑕᛶ Cs ỿ╔㔞䠈ᯘෆ㞵䛚䜘䜃 cm ༢఩䛾ᚤᆅᙧ䜔῝ᗘ᪉ྥ䛺䛹䠈௚䛾ᅉᏊ䛾✵㛫ⓗ୙ᆒ㉁ᛶ䜢ຍ࿡䛧䛶⥲ྜⓗ䛺ホ౯䜢⾜䛖ணᐃ䛷䛒䜛䚹䛆ཧ⪃ᩥ⊩䛇
1䠅 㜿㒊ᐶಙ䠈▼஭ᗣ㞝䠈᪂㔛ᛅྐ䠈୕⏣ᆅ຾᫛䠈Ώ㑔㈗ၿ䠈బ䚻ᮌ⚈ே䠄2014䠅䠗
ᨺᑕᛶ≀㉁䛾⛣ືᣲືホ౯䛻ಀ䜛᳃ᯘ䛻䛚䛡䜛㛗ᮇ䝰䝙䝍䝸䞁䜾䠄䛭䛾 2䠅䠈᪥ᮏ
ᆅ㉁Ꮫ఍➨ 121 ᖺᏛ⾡኱఍

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㼗㻮㼝㻌㻛㼗㼓

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ᅗ ᶞᖿ㏆ഐ⾲ᒙᅵተ࡟࠾ࡅࡿ㸦ᕥ㸧pH㸦H2O㸧࡜㸦ྑ㸧ᨺᑕᛶ Cs ⃰ᗘ
Properties and Distribution of Radioactive Caesium of the Surface Soil of Japanese Cedar Forest in
Fukushima
ISHII, Y., SASAKI, Y., KIKUCHI, N., WATANABE, T., ODA, Y.,NIIZATO,T.
and NIIZATO, T.

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3A08

ᠱ ⃮ ែ ཬ 䜃 ⁐ Ꮡ ែ ᨺ ᑕ ᛶ 㻯 㼟 䛾 ᳃ ᯘ 䛛 䜙 Ἑ ᕝ 䜈 䛾 ὶ ฟ㻌㻔ཎᏊຊᶵᵓ㻕䕿➉ෆ⤮㔛ዉ䚸Ᏻ⸨㯞㔛Ꮚ䚸すᮧ࿘స䚸୰す㈗ᏹ䚸㒔⠏ඞ⣖䚸ᑠᔒ῟䚸ᯇỌṊ㻌䛆ㅖゝ䛇㻌 ᮾி㟁ຊ⚟ᓥ➨୍ཎᏊຊⓎ㟁ᡤࡢ஦ᨾ࡟ࡼࡾᨺฟࡉࢀࡓᨺᑕᛶ Cs ࡣࠊ⌧ᅾࡶ᳃ᯘ࡟
ከࡃỿ╔ࡋ࡚࠾ࡾࠊ㝆㞵࡞࡝࡟ࡼࡿἙᕝ࡬ࡢὶฟࡀᠱᛕࡉࢀ࡚࠸ࡿࠋᮏ◊✲࡛ࡣࠊ㝆㞵㔞࡞࡝ࡢᏘ⠇ኚື࡜ᨺᑕᛶ Cs ࡢὶฟᣲືࡢ┦㛵ࢆㄪ࡭ࡿࡓࡵ࡟ࠊᨺᑕᛶ Cs ࢆ㐃⥆ⓗ࡟ᤕ㞟ࡍࡿ⿦⨨ࢆタ⨨ࡋࠊ᳃ᯘ࠿ࡽἙᕝ࡬ࡢᨺᑕᛶ Cs ࡢὶฟ㔞ࢆ⢏ᚄࡢ␗࡞ࡿᠱ⃮ែ࡜⁐Ꮡែ࡟ศࡅ࡚
ホ౯ࢆ⾜ࡗࡓࠋ㐃⥆ⓗ࡞ ᐃࢆ⾜࠺ࡇ࡜࡛⣙ 1 ࣧ᭶ࡢศゎ⬟࡛Ꮨ⠇ኚືࢆぢࡿࡇ࡜ࡀ࡛ࡁࠊ
㞵㔞ࡸἙᕝࡢࢹ࣮ࢱ࡜ྜࢃࡏ࡚ὶฟᣲືࢆホ౯ࡍࡿࡇ࡜ࡀྍ⬟࡛࠶ࡿࠋ䛆ᐇ㦂䛇㻌 ヨ㦂ᑐ㇟ᆅࡣࠊ⚟ᓥ➨୍ཎⓎ࠿ࡽ༡す⣙ 67 km 㞳ࢀࡓ࡜ࡇࢁ࡟఩⨨ࡋ࡚࠸ࡿ໭Ⲉᇛᕷ
ࡢ᳃ᯘ㞟Ỉᇦෆ(㠃✚⣙ 0.7 km2ࠊᶆ㧗 580㹼720 m)ࡢᑠἙᕝ࡛࠶ࡿࠋᮏⓎ⾲࡛ࡣ 2012 ᖺ 11 ᭶࠿ࡽ 2013 ᖺ 12 ᭶࡟࠿ࡅ࡚ほ ࢆ⾜ࡗࡓࠋᠱ⃮≀ࡣࠊ2 ࡘࡢ࣮࢝ࢺࣜࢵࢪࣇ࢕ࣝࢱ࣮ࣁ࢘ࢪ
ࣥࢢ(ADVANTEC 〇)࡟Ꮝᚄࡢ␗࡞ࡿ࣮࢝ࢺࣜࢵࢪࣇ࢕ࣝࢱ࣮(Ꮝᚄ 100 µm ཬࡧ 0.5 µmࠊ
ADVANTEC 〇)ࢆࡑࢀࡒࢀ 6 ᮏࡎࡘධࢀࠊἙᕝỈࢆ㏻Ỉࡉࡏ࡚ᤕ㞟ࡋࡓࠋᅇ཰ࡋࡓᠱ⃮≀ࡣࠊ
4 ࡘࡢࢧ࢖ࢬ(F1㸸!"""#$% ௨ୖࠊF2㸸500-2000 µmࠊF3㸸75-&""#$%ࠊF4㸸'&#$% ௨ୗ)࡟⠠ูࡋࡓࠋ⁐Ꮡែ Cs ࡣࠊCs ྾╔๣(AnfezhTM [1]ࠊEksorb 〇)ࢆ඘ሸࡋࡓ 2 ᮏࡢ࣏ࣜሷ໬ࣅࢽࣝ〇࣒࢝ࣛ࡟㏻Ỉࡉࡏ࡚ᤕ㞟ࡋࡓࠋ࣮࢝ࢺࣜࢵࢪࣇ࢕ࣝࢱ࣮ཬࡧ࣒࢝ࣛࡣࠊ1 ࣧ᭶ẖ࡟஺᥮ࡋࡓࠋ
ྛヨᩱࡣ஝⇱ࡉࡏࡓᚋࠊGe ༙ᑟయ᳨ฟჾ(GEM25P4-70ࠊORTEC 〇;LO-AX-51370/20PࠊORTEC〇;GEM20 ᆺࠊAMETEK 〇)࡛ ( ⥺ ᐃࢆ⾜ࡗࡓࠋ㻌䛆⤖ᯝཬ䜃⪃ᐹ䛇㻌 ᅗ 1-(a)ࡣ༢఩㏻Ỉ㔞࠶ࡓࡾࡢᠱ⃮ែཬࡧ⁐Ꮡែࡢ 137Cs ᨺᑕ⬟๭ྜࢆ♧ࡍࠋኟ㹼⛅Ꮨ(5㹼10 ᭶)ࡣ㝆㞵㔞ࡀከࡃᅵ◁ࡀቑ࠼ࡿࡇ࡜࠿ࡽᠱ⃮ែ Cs ࡢὶฟ๭ྜࡀከࡃࠊ෤Ꮨ
(12㹼4 ᭶)࡟࡞ࡿ࡜
⁐Ꮡែ Cs ࡢὶฟ๭ྜࡀቑຍࡍࡿഴྥࡀぢࡽࢀࡓࡀࠊ㸯
ᖺࢆ㏻ࡋ࡚ᠱ⃮ែࡢ๭ྜࡣ࠸ࡎࢀࡶ
50㸣ࢆ㉸࠼࡚࠸ࡓࠋ
ᅗ 1-(b)ࡣᠱ⃮ែ୰ࡢ⢏ᚄูࡢ 137Cs ᨺᑕ⬟ศᕸࢆ♧ࡍࠋ࡯࡜ࢇ࡝ࡀ F4 ࡛ὶฟࡋ࡚࠸ࡿࡇ࡜ࢆ
♧ࡋࡓࠋᙜ᪥ࡣࠊ
ᨺᑕᛶ Cs ὶฟ㔞ࡢᏘ⠇ኚື࡜⎔ቃᅉᏊࡢ㛵ಀ࡟ࡘ࠸࡚
ࡶ㆟ㄽࡍࡿࠋ
䛆ཧ⪃ᩥ⊩䛇㻌 [1] V. P. Remez et.al., Appl. Radiat. Isot., Vol. 47, No. 9/10, 885-886 (1996).
Fluvial discharges of particulate and dissolved radiocesium from a forest catchment (JAEA)
TAKEUCHI, E., ANDOH-ATARASHI, M., NISHIMURA, S., NAKANISHI, T., TSUDUKI, K.,
KOARASHI, J., MATSUNAGA, T.

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3A09⎔ቃ୰ࡢᨺᑕᛶࢭࢩ࣒࢘ᤕ㞟࡟࠾ࡅࡿ࣒࣭࢝ࣜ࢘࢔ࣥࣔࢽ࣒࢘࢖࢜ࣥࡢᙳ㡪
ᮾ኱ RICࠊಙ኱ࣄࢺ⎔ ࠊ⇃኱㝔⏕࿨  ‫ۑ‬ᱠᇉṇ࿃ ࠊᘅ⏣ᫀ኱ ࠊఀ⸨ⱱᶞ 

Decontamination Efficiency (%)

䛆⥴ゝ䛇࣒࢝ࣜ࢘⫧ᩱࡣࠊᅵተ࠿ࡽ㎰స≀࡬ࡢᨺᑕᛶࢭࢩ࣒࢘ࡢ⛣⾜ࢆపῶࡉࡏࡿຠᯝࡀ࠶ࡿ
࡜ࡉࢀ࡚࠾ࡾࠊ࢖ࢿࡢởᰁᑐ⟇࡜ࡋ࡚Ỉ⏣࡬ࡢ᪋⫧ࢆዡບࡍࡿሗ࿌ࡀ࠶ࡿࠋࡲࡓࠊࢭࢩ࣒࢘
ࡢᤕ㞟࡟ࡣࣉࣝࢩ࢔ࣥࣈ࣮ࣝ㸦PB㸧ࡀ᭷ຠ࡜ࡢሗ࿌ࡀ࠶ࡾࠊPB ࢆ฼⏝ࡋࡓ୙⧊ᕸ〇ࣇ࢕ࣝࢱ࣮ࡣࠊࢮ࢜ࣛ࢖ࢺ࡜ࡣ␗࡞ࡾ↝༷ῶᐜ࡛ࡁࡿࡓࡵࠊ㝖ᰁ࡛Ⓨ⏕ࡋࡓởᰁỈ࡬ࡢ㐺⏝ࡀ⮬἞య࡟ࡼࡾ᳨ウࡉࢀ࡚࠸ࡿࠋᡃࠎࡣඛ⾜◊✲࡛ࠊK+ࡸ NH4+ࡀᏑᅾࡍࡿỈ⁐ᾮ࡟ởᰁᅵተࢆᢞධࡍ
ࡿ࡜ᨺᑕᛶࢭࢩ࣒࢘ࡢ⁐ฟࡀಁ㐍ࡉࢀࡿ୍᪉࡛ࠊPB ࣇ࢕ࣝࢱ࣮࡬ࡢᤕ㞟ࢆጉࡆࡿࡇ࡜ࢆሗ࿌
ࡋࡓ(1ࠋᮏ◊✲࡛ࡣࠊPB ࣇ࢕ࣝࢱ࣮࡟ࡼࡿ⎔ቃ୰ᨺᑕᛶࢭࢩ࣒࢘ᤕ㞟࡬ࡢ㐺⏝ྍ⬟ᛶࢆ᫂ࡽ࠿࡟ࡍࡿࡓࡵࠊởᰁࡉࢀࡓᮌᮦ࠿ࡽᢳฟࡋࡓᨺᑕᛶࢭࢩ࣒࢘ࡢ K+ࡸ NH4+ࡀᏑᅾࡍࡿ᮲௳ୗ࡟
࠾ࡅࡿ PB ࣇ࢕ࣝࢱ࣮࡟ࡼࡿᤕ㞟ຠᯝࢆホ౯ࡋࡓࠋ䛆ᐇ㦂䛇ཎᮌࢩ࢖ࢱࢣ᱂ᇵ࡟⏝࠸ࡽࢀࡿࢥࢼࣛ㸦134Cs㸸160Bq/kg, 137Cs㸸440Bq/kg㸧ࡀ⭉㣗ࡋࡓ⭉᳜ᅵ࡜⵨␃Ỉࢆ㉁㔞ẚ 1㸸2 ࡛ᐦ㛢ᐜჾ࡟ධࢀ࡚ 5 ᪥㛫ᐊ ࡛㟼⨨ᚋࠊᐃᛶℐ⣬࡛ℐ㐣ࡋ࡚Ỉ⁐ᾮ୰࡟ᨺᑕᛶࢭࢩ࣒࢘ࢆᢳฟࡉࡏࡓࠋࡑࡢᚋࠊPB ࣇ࢕ࣝࢱ࣮࡟ࡼࡗ࡚ℐ㐣ࡋ࡚⁐ᾮࢆᐃ㔞ࡋ࡚ᤕ㞟ຠ⋡ࢆồࡵࡓࠋẚ㍑ࡢࡓࡵࠊ137CsCl ᶆ‽Ỉ⁐ᾮࢆ⵨␃Ỉ࡛ᕼ㔘ࡋࡓࡶࡢࢆ⏝࠸࡚ྠᵝࡢℐ㐣ࢆ⾜࠸ࠊᤕ㞟ຠ⋡ࢆồࡵࡓࠋ䛆⤖ᯝ䛇ᅗ࡟ PB ࣇ࢕ࣝࢱ࣮࡟
0ࡼࡿᨺᑕᛶࢭࢩ࣒࢘ᤕ㞟ຠ
Cs from wood + water++⋡ࢆ♧ࡍࠋK ࡸ NH4 ࡀᏑᅾ
CsCl + water
20ࡋ࡞࠸ሙྜࠊ⭉᳜ᅵ࠿ࡽᢳ
CsCl + K SO 1%
CsCl + (NH )SO 1%
ฟࡋࡓᨺᑕᛶࢭࢩ࣒࢘ࡣࠊ
40
CsCl + K SO 45%
137
CsCl ᶆ‽Ỉ⁐ᾮ୰ࡢᨺᑕ
CsCl + (NH )SO 45%
60ᛶࢭࢩ࣒࢘࡜ྠᵝ࡟ࠊPB ࡟'CsCl + K SO 100%''CsCl + (NH )SO 100%'ࡼࡗ࡚ᤕ㞟ࡉࢀࡸࡍࡃࠊ2 ᅇ80ࡢᤕ㞟࡟ࡼࡗ࡚࡯ࡰ 100%ࡀᤕ㞟ࡉࢀࡓࠋ
100䛆⪃ᐹ䛇137CsCl ᶆ‽Ỉ⁐ᾮ୰0
12ࡢᨺᑕᛶࢭࢩ࣒࢘ࡣࠊ࢟ࣕ
Cumulative Filtrationsࣜ࢔ࣇ࣮ࣜࡢ 137Cs+࡛࠶ࡾࠊᅗ PB ࣇ࢕ࣝࢱ࣮࡟ࡼࡿᨺᑕᛶࢭࢩ࣒࢘ࡢᤕ㞟ຠ⋡⎔ቃ୰࡟Ꮡᅾࡍࡿࡼ࠺࡞ᅵ
ተࡢᵓ㐀୰࡟ධࡾ㎸ࢇࡔࡶࡢࡸࠊ᭷ᶵ≀࡟⤖ྜࡋࡓࡶࡢ࡜ࡣ␗࡞ࡿࠋ୍᪉ࠊ⭉᳜ᅵ࠿ࡽᢳฟ
ࡉࢀࡓᨺᑕᛶࢭࢩ࣒࢘ࡢ PB ࣇ࢕ࣝࢱ࣮࡟ࡼࡿᤕ㞟ຠ⋡ࡣࠊ࢟ࣕࣜ࢔ࣇ࣮ࣜࡢ 137Cs+࡜ྠ⛬ᗘ࡛࠶ࡿࡇ࡜ࡀ᫂ࡽ࠿࡟࡞ࡗࡓࠋ
Ⓨ⾲࡛ࡣࠊ⭉᳜ᅵ࠿ࡽᢳฟࡉࢀࡓᨺᑕᛶࢭࢩ࣒࢘ࡶ K+ࡸ NH4+ࡀᏑᅾࡍࡿ᮲௳ୗ࡛ࡣࠊPB
ࣇ࢕ࣝࢱ࣮࡟ࡼࡿྲྀࡾ㎸ࡴാࡁࢆጉᐖࡍࡿ࠿ྰ࠿࡟ࡘ࠸࡚ࡶ㏙࡭ࠊ⎔ቃ୰ᨺᑕᛶࢭࢩ࣒࢘ᤕ
㞟࡬ࡢ㐺⏝ྍ⬟ᛶ࡟ࡘ࠸࡚ሗ࿌ࡍࡿࠋ
䛆ཧ⪃ᩥ⊩䛇(1 ᘅ⏣ᫀ኱ࠊᱠᇉṇ࿃ࠊఀ⸨ⱱᶞࠕࣉࣝࢩ࢔ࣥࣈ࣮ࣝࢆ⏝࠸ࡓởᰁᅵተ࣭ởᰁỈ࠿ࡽ
134+137

2

4

4

2

4

4

4

2

4

4

4

4

ࡢࢭࢩ࣒࢘㝖ཤ࡟࠾ࡅࡿ࣒࢝ࣜ࢘࢖࢜ࣥཬࡧ࢔ࣥࣔࢽ࣒࢘࢖࢜ࣥࡢᙳ㡪ࠖࠊProceedings of the 15th
Workshop on Environmental Radioactivity (KEK Proceedings) (in press).

Influence of potassium and ammonium ion in filtering the environmental radiocesium
HIGAKI, S.,HIROTA, M., ITO, S.

- 91 -

3A10

Ⲕᶞ୰࡟࠾ࡅࡿᨺᑕᛶࢭࢩ࣒࢘࠾ࡼࡧࢺࣜࢳ࣒࢘ࡢ⛣⾜ᣲືࡢゎ᫂㟼኱㝔⌮ ࠊ㟼኱㝔㎰  ‫‮ۑ‬ᒣ೺ኴ ࠊబ⸨⨾ဏ ࠊ㬞ᚿ⏣⍞✑ ࠊ୍ᐙ ᓫᚿ ࠊ᳃⏣᫂㞝 ࠊ㏆⏣ᣅᮍ ࠊ኱▮ᜤஂ ࠙⥴ゝࠚཎᏊຊⓎ㟁ᡤ஦ᨾ᫬࡟ࡣᵝࠎ࡞ᨺᑕᛶ᰾✀ࡀ⎔ቃ୰࡟ᨺฟࡉࢀࡿࠋ≉࡟ᨺᑕᛶࢭࢩ࣒࢘
㸦137Cs㸧ࡸࢺࣜࢳ࣒࢘㸦3H㸧ࡣ༙ῶᮇࡢ㛗ࡉ࠿ࡽ㛗ᮇⓗ࡞⎔ቃ࡬ࡢᙳ㡪ࡀᠱᛕࡉࢀ࡚࠸ࡿࠋ㟼ᒸ┴ࡣⲔࡀ≉⏘≀࡛࠶ࡾࠊ㣗ࡢᏳ඲ᛶ࠾ࡼࡧ㢼ホ⿕ᐖ㜵ṆࡢほⅬ࠿ࡽⲔᶞ୰࡛ࡢᨺᑕᛶࢭࢩ࣒࢘࠾
ࡼࡧࢺࣜࢳ࣒࢘ࡢ⛣⾜ᣲືࡢ⌮ゎࡀ㔜せ࡛࠶ࡿࠋᮏ◊✲࡛ࡣࠊ137Cs ཪࡣ 3H ࢆྵࢇࡔỈ⪔ᾮ࡛᱂ᇵࡋࡓⲔࢆ⏝࠸࡚ࠊⲔᶞ୰࡟࠾ࡅࡿ 137Cs ࡜ 3H ࡢศᕸ࠾ࡼࡧ㣧⏝Ⲕ࡜ࡋࡓ㝿ࡢ⁐ฟᣲືࢆࠊ࢖࣓
࣮ࢪࣥࢢࣉ࣮ࣞࢺ㸦IP㸧࠾ࡼࡧ NaI (Tl)ࢩࣥࢳ࣮ࣞࢩ᳨ࣙࣥฟჾࢆ⏝࠸࡚ホ౯ࡋࡓࠋ
࠙ᐇ㦂ࠚヨᩱ࡜ࡋ࡚㟼ᒸ┴⏘ࡢⲔࢆ⏝࠸ࡓࠋⲔࡣ᦬ࡳྲྀࡾᚋࠊ᮰㸦 ⰺ  ⴥ㸧࡟ࡲ࡜ࡵࠊⱼ㒊ࢆሷ໬ࢭࢩ࣒࢘㸦137CsCl㸧Ỉ⁐ᾮ㸦74 Bq / mL㸧࡟ 2 ᪥㛫ᾐₕࡋࡓࠋᾐₕᚋࠊⲔⴥࢆỈ࡛Ὑ࠸ὶࡋࠊ
୍㒊ࡢヨᩱࢆ IP ࡟࡚ 137Cs ࡢศᕸࢆㄪ࡭ࡓࠋṧࡾࡢヨᩱࡣ㓝⣲ኻάࡢࡓࡵẅ㟷ฎ⌮ࢆ⾜ࡗࡓࡢࡕࠊ
༙ศࡣᡭࡶࡳฎ⌮ࢆ⾜࠸ࠊࡍ࡭࡚ࡢヨᩱࢆ 50 Υࡢࢻࣛ࢖࣮࢜ࣈࣥࢆ⏝࠸࡚஝⇱ࡋࡓࠋ஝⇱ᚋࠊⱼ࡜ⴥࡢศ㞳ࢆ⾜࠸ 4 ✀㢮ࡢヨᩱࢆస〇ࡋࡓࠋヨᩱ࡟⵳✚ࡋࡓ 137Cs ࢆ ᐃࡍࡿࡓࡵ࡟ NaI(Tl)ࢩ
ࣥࢳ࣮ࣞࢩ᳨ࣙࣥฟჾ࡟࡚
ࡓᐃࢆ⾜ࡗࡓࠋྛヨᩱࢆ 100 mL ࡢỈ࡟ᾐₕࡋࡓᚋࠊྛヨᩱ୰࡟ṧ␃ࡋ

137

Cs ࢆ ᐃࡍࡿࡇ࡜࡛ᐇ㦂๓ࡢ 137Cs ྵ᭷㔞࡜ࡢᕪศࢆ࡜ࡿࡇ࡜࡛ 137Cs ࡢỈ࡬ࡢ⁐ฟᣲືࢆᐃࡋࡓࠋ⁐ฟ ᗘࡣ࢛࣮࢘ࢱ࣮ࣂࢫࢆ⏝࠸࡚ 25Υࠊ50Υࠊ75Υ࡜ࡋࠊ⁐ฟ᫬㛫ࢆ 0 - 75000 ⛊ࡲ࡛ኚ໬ࡉࡏࡓࠋ
࠙⤖ᯝ࣭⪃ᐹࠚ137Cs ⁐ᾮ࡛᱂ᇵࡉࢀࡓⲔࡢ IP ࡢ⤖ᯝ࠿ࡽࠊ྾࠸ୖࡆࡽࢀࡓ 137Cs ࡣⴥ࡜ẚ㍑ࡋⱼ
୰࡟ከࡃࡢ 137Cs ࡀ⁫␃ࡋ࡚࠸ࡓࠋⱼ࠿ࡽỈ⁐ᾮ࡜ࡋ࡚྾཰ࡋ࡚࠸ࡿ࡟ࡶ࠿࠿ࢃࡽࡎ 137Cs ࡣࢫ࣏ࢵࢺ≧࡟ศᩓࡋ࡚࠸ࡓࠋࡲࡓࠊ⠇㸦ⴥ࡜ⱼࡢศᒱࡋ࡚࠸ࡿ࡜ࡇࢁ㸧࡟≉␗ⓗ࡟㞟ࡲࡗ࡚࠸ࡿࡇ࡜
ࡀࢃ࠿ࡗࡓࠋ㣧⏝ฎ⌮ࢆ⾜ࡗࡓⲔ࡟࠾࠸࡚ⱼ㒊ศ࡟࠾ࡅࡿ 137Cs ⁫␃㔞ࡣⲔⴥ୰ࡢ஧ಸ௨ୖ࡛࠶ࡗ
ࡓࠋᡭࡶࡳฎ⌮ࢆ⾜ࡗࡓヨᩱ࡛ࡣࠊẅ㟷ࡢࡳ⾜ࡗࡓヨᩱࡼࡾࡶ 1.5 ಸ⛬ᗘ 137Cs 㔞ࡀከࡃ᳨ฟࡉࢀ
ࡓࡇ࡜࠿ࡽࠊࢫ࣏ࢵࢺ≧࡟ศᕸࡋ࡚࠸ࡿ 137Cs ࡀᡭࡶࡳฎ⌮࡟ࡼࡾࠊヨᩱ඲య࡟ᆒ୍࡟ศᕸࡋࠊぢ࠿ࡅࡢ༢఩㔜㔞ᙜࡓࡾࡢᨺᑕ⬟ࡀቑຍࡋࡓ࡜⪃࠼ࡽࢀࡿࠋᅗ࡟ẅ㟷ࡢࡳ⾜ࡗࡓⲔⴥヨᩱࡢⱼ㒊఩࡟࠾ࡅࡿྛ ᗘ࡛ࡢ 137Cs ⁐ฟᣲືࢆ♧ࡍࠋ137Cs ࡢᨺฟ๭ྜࡣᾐₕ᫬㛫ቑຍ࡟క࠸ቑຍࡋࡓࡀࠊ
75000 ⛊ࡢᾐₕ᫬㛫࡟ࡶ࠿࠿ࢃࡽࡎ 137Cs ࡢ⣙ 10%ࡣⱼ୰࡟ṧ␃ࡋࡓࠋࡇࡢࡇ࡜࠿ࡽⲔⴥ࡟ṧ␃ࡋ
ࡓ 137Cs ࡣࠊⲔ࡬ࡢ྾╔ཬࡧ᭷ᶵ⤖ྜᆺࢭࢩ࢘

100࠿ࡽ⟬ฟࡋࡓ࡜ࡇࢁ 0.093 eV ࡛࠶ࡗࡓࠋ㐣ཤࡢሗ࿌ࡼࡾⲔ⾲㠃࠿ࡽỈ࡬ࡢ 137Cs ⁐ฟࡢάᛶ໬࢚ࢿࣝࢠ࣮ࡣ 0.045 eV ࡛࠶ࡿࠋᮏᐇ㦂࡛ࡣ⣽⬊ෆ࠿ࡽࡢ 137Cs ⁐ฟࡀ⪃࠼ࡽࢀࡿࡓࡵ⾲㠃࠿ࡽࡢ 137Cs ⁐ฟᣲື࡜ẚ㍑ࡋࠊάᛶ໬࢚ࢿࣝ

137

࡟㛵ࡍࡿάᛶ໬࢚ࢿࣝࢠ࣮ࢆ࢔ࣞࢽ࢘ࢫࡢᘧ

Cs release ratio (%)࣒࡜ࡋ࡚ṧ␃ࡋ࡚࠸ࡓ࡜♧၀ࡋࡓࠋ137Cs ⁐ฟ

80
60

ẅ㟷㼋ⱼ
㻌㻣㻡䉝
㻌㻞㻡䉝
㻌㻡㻜䉝

40
20

ࢠ࣮ࡀ኱ࡁࡃ࡞ࡗࡓࡇ࡜ࡀ♧၀ࡉࢀࡓࠋᮏⓎ⾲࡛ࡣࠊࢺࣜࢳ࣒࢘Ỉࢆ⏝࠸࡚᱂ᇵࡋࡓⲔᶞ୰࡟
࠾ࡅࡿ 3H ࡢ⛣⾜ᣲື࡟㛵ࡋ࡚ࡶྠᵝ࡟ホ౯ࡋࠊ

0

0

25000

50000

Time / s75000

ᅗ ྛヨᩱෆ㒊࡟྾཰ࡉࢀࡓ 137Cs 㔞㆟ㄽࡍࡿணᐃ࡛࠶ࡿࠋ
Elucidation of migration behavior of radioactive cesium and tritium in tea plants
YUYAMA, K., SATO, M., KAMOSHITA, M., IKKA, T., MORITA, A., CHIKADA, T., OYA, Y.

- 92 -

3A11

ᆅ⾰㢮ࡢᨺᑕᛶࢭࢩ࣒࢘ಖᣢ≉ᛶ࡜㝆ୗ≀㔞ᣦᶆ࡜ࡋ࡚ࡢ㐺⏝ྍ⬟ᛶ-$($ ⚟ᓥ ࠊ⛉༤  ‫ۑ‬ᅵ⫧㍤⨾ ࠊ኱ᮧ჆ே ࠊ⸨ཎ೺ኊ ࠊ㣤ᓥ࿴Ẏ 㻌ᆅ⾰㢮ࡣࠊ⳦㢮࡜⸴㢮ࡢඹ⏕య࡛࠶ࡾࠊ(i)ᶞ⓶ࡸᒾୖ࡞࡝࡟╔⏕ࡋࠊ㝣ୖ⏕ែ⣔࡟ᗈࡃศ
ᕸࡍࡿࠊ(ii)⥔⟶᮰᳜≀ࡢࡼ࠺࡞᰿ࢆᣢࡓࡎࠊ኱Ẽ୰ࡢỈศࡸᾋ㐟≀ࢆ┤᥋ྲྀࡾ㎸ࡳಖᣢࡍࡿࠊ
(iii)ᖺ㛫ᡂ㛗㔞ࡀᑡ࡞ࡃᑑ࿨ࡣᩘ༑ᖺ࡜ẚ㍑ⓗ㛗࠸ࠊ࡞࡝ࡢᛶ㉁ࢆᣢࡘࠋࡇࡢࡼ࠺࡞≉ᛶ࠿ࡽࠊᆅ⾰㢮ࡣ኱Ẽᅪ᰾ᐇ㦂ࡸࢳ࢙ࣝࣀࣈ࢖ࣜ஦ᨾ࡞࡝ࠊ㛗ᮇ㛫࡟ࢃࡓࡾᨺᑕᛶ㝆ୗ≀ࡢởᰁ≧ἣホ౯࡟⏝࠸ࡽࢀ࡚ࡁࡓࠋ⚟ᓥ➨୍ཎᏊຊⓎ㟁ᡤ஦ᨾ㸦௨ୗࠊࠕ஦ᨾࠖ࡜࠸࠺㸧࡟ࡼࡾ⎔ቃ୰࡟ᨺฟࡉࢀࡓᨺᑕᛶࢭࢩ࣒࢘ࡣࠊ㢼㞵➼࡟ࡼࡗ࡚㛗ᮇⓗ࡟⏕ែ⣔ෆࢆ⛣ືࡍࡿ࡜ண᝿ࡉࢀࡿࠋ
ᨺᑕᛶࢭࢩ࣒࢘ࡢᅵተỿ╔㔞ࡣࠊ࢙࢘ࢨࣜࣥࢢ➼ࡢせᅉ࡟ࡼࡗ࡚᫬㛫⤒㐣࡜ඹ࡟ẚ㍑ⓗ㏿ࡃ
ῶᑡࡋ࡚࠸ࡃࡢ࡟ᑐࡋࠊᆅ⾰㢮୰ࡢᨺᑕᛶࢭࢩ࣒࢘ࡣ㛗ᮇ㛫ಖᣢࡉࢀࡿࡇ࡜ࡀ▱ࡽࢀ࡚࠸ࡿࠋ
ᚑࡗ࡚㸪஦ᨾᚋࡢ⏕ែ⣔࡟࠾ࡅࡿᨺᑕᛶࢭࢩ࣒࢘ࡢືែホ౯ࢆ⾜࠺ୖ࡛㸪⎔ቃヨᩱ୰ࡢᨺᑕ
ᛶࢭࢩ࣒࢘ࡢᣲືㄪᰝ࡟ຍ࠼࡚㸪ᆅ⾰㢮࡟࠾ࡅࡿಖᣢ≉ᛶࡶ᫂ࡽ࠿࡟ࡍࡿࡇ࡜ࡀᚲせ࡛࠶ࡿࡀ㸪᪥ᮏ⏘ᆅ⾰㢮࡟㛵ࡍࡿ▱ぢࡣሗ࿌ࡉࢀ࡚࠸࡞࠸ࠋ
ᮏ◊✲࡛ࡣࠊ⚟ᓥ┴ෆࡢᆅ⾰㢮ࢆᑐ㇟࡟ᨺᑕᛶࢭࢩ࣒࢘ࢆ㛗ᮇ㛫Ᏻᐃࡋ࡚ಖᣢࡍࡿ࠿࡟ࡘ
࠸࡚᫂ࡽ࠿࡟ࡍࡿࡇ࡜ࢆ┠ⓗ࡜ࡋ࡚ࠊᆅ⾰㢮୰ࡢᨺᑕᛶࢭࢩ࣒࢘⃰ᗘࡢ⤒᫬ኚ໬ࢆㄪ࡭ࡓࠋ
ㄪᰝࡣ 2013 ᖺ 7 ᭶࠿ࡽ 2014 ᖺ 7 ᭶࡟࠿ࡅ࡚⾜ࡗࡓࠋㄪᰝᆅⅬࡣࠊ୺࡟⚟ᓥ┴ෆࡢ஦ᨾࡢ
ᙳ㡪ࢆᙉࡃཷࡅࡓᆅᇦࢆᑐ㇟࡜ࡋࡓࠋᆅ⾰㢮ࡢ✀㢮࡟ࡘ࠸࡚ࡣࠊ⚟ᓥ➨୍ཎᏊຊⓎ㟁ᡤ࿘㎶ࡢపᆅ࡟ᗈࡃศᕸࡋ࡚࠸ࡿ࣓࢘ࣀ࢟ࢦࢣ㢮㸦Flavoparmelia caperata, Parmotrema clavuliferum➼㸧࡛ࢧࢡࣛࡢᶞᖿ࡟⏕⫱ࡍࡿಶయ࡟╔┠ࡋࡓࠋྠ୍ಶయ࡟࠾ࡅࡿᨺᑕᛶࢭࢩ࣒࢘⃰ᗘࡢ⤒᫬ኚ໬ࢆㄪ࡭ࡿࡓࡵ࡟ GM ⟶ᘧࢧ࣮࣋࢖࣓࣮ࢱ㸦ALOKA ♫〇 TGS-146B㸧ࢆ⏝࠸ࡓࠋ ᐃ
ࡣࠊ20mm ཌࡉࡢ㖄ࢥ࣓࣮ࣜࢱࢆ⏝࠸࡚᫬ᐃᩘ 10 ⛊࡛⾜ࡗࡓࠋ⤖ᯝࢆᅗ 1 ࡟♧ࡍࠋᅗ୰ࡢ
Ⅼ⥺ࡣࠊྛᆅ⾰㢮ಶయࡢึᮇ
ᐃ್࠿ࡽࡢ≀⌮Ꮫⓗ༙ῶᮇ࡟ࡼࡿῶ⾶ࢆ♧ࡍࠋ௒ᅇࡢ⤖ᯝ࡛ࡣࠊࡍ࡭࡚ࡢᆅ⾰㢮࡟Ꮡᅾࡍࡿᨺᑕᛶࢭࢩ࣒࢘ࡢ㔞ࡀ≀⌮ⓗῶ⾶ࡼࡾࡶቑຍࡍࡿഴ
ྥ࡟࠶ࡗࡓࡇ࡜ࢆ☜ㄆ࡛ࡁࡓࠋ
ࡇࡢࡇ࡜࠿ࡽࠊᆅ⾰㢮ࡀᶞᖿὶࢆ㏻ࡋ࡚ᶞෙࡶࡋࡃࡣᖿ࡟
Ꮡᅾࡍࡿᨺᑕᛶࢭࢩ࣒࢘ࡢ౪
⤥ࢆཷࡅ࡚ࠊᆅ⾰యෆ࡟ᨺᑕ
ᛶࢭࢩ࣒࢘ࢆ཰╔࣭ಖᣢࡋ࡚
࠸ࡿྍ⬟ᛶࡀ⪃࠼ࡽࢀࡿࠋ

Retention characteristics of radiocaesium in lichens and their applicability as fall-out indicator
DOHI, T., OHMURA, Y., FUJIWARA, K., IIJIMA, K.

- 93 -

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WUHHERG\(1Graduate School of Bioagricultural Sciences, Nagoya University) ‫ۑ‬WANG, W. 1, KANASASHI, T.
1, SUGIURA, Y. 1, TAKENAKA, C.1

Introduction
The Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident in March 2011 resulted in therelease of large amounts of radionuclides and contaminated large areas of forests in Fukushima
Prefecture. To develop effective countermeasures to mitigate the impacts of radioactive contamination
on forests and ensure the safe use of wood, understanding of the dynamics of 137Cs in forest ecosystem
is important. In present study, we investigated the distribution of radiocesium and its relationship withthe other elements in different parts of tree body. The primary purposes are to clarify the uptake
pathway of 137Cs and to predict its behavior and accumulation within tree body.
Materials and methods
Two tree species were selected for thestudy: Sugi (Cryptomeria japonica) and Koshiabura(Eleutherococcus sciadophyllodides). Trees were collected from forests located about 30 km awayfrom the Fukushima Dai-ichi Nuclear Power Plant. After felling the trees, stem disks from several
vertical positions, branches and leaves were sampled. Disks were further separated into bark, sapwood
and heartwood in laboratory. The 137Cs concentration (Bq kg-1) in different parts (bark, wood andfoliage) was measured by gamma-ray spectrometry with a germanium semiconductor detector.
Multi-elements (K, Rb, Mn and 133Cs) concentration was determined by inductively coupled plasma
mass spectrometer (ICP-MS).
Results and discussion
In the case of E. sciadophyllodides, the correlation between 137Cs and the other elements variedamong different tree components. 137Cs showed positive correlation with all the alkali metals (K, Rb
and 133Cs) in all the parts. The correlation between 137Cs and K, Rb in different tree parts was in theorder of wood>leaves>bark, amongst, correlation between 137Cs and K was extremely significant(r=0.919, p<0.01) in wood and significant (r=0.641, p<0.05) in leaves. The same tendency was also
observed for 133Cs which had the highest correlation with 137Cs compared to other elements. Since E.
sciadophyllodides is a hyperaccumulator for Mn, we also studied its relationship with 137Cs, in contrast
to alkali metals, high correlation was only found in leaves.
The high correlation between 137Cs and 133Cs indicates that radiocesium was well mixed with thestable Cs within the biological cycle in the forest ecosystems two and half years after accident. The
chemical similarities between 137Cs and K lead to the high correlation between them whereas thedifference in wood and leaves may be attributable to their different physiological role.

- 94 -

3A13

㔝⳯࡬ࡢᨺᑕᛶࢭࢩ࣒࢘ࡢ⛣⾜࡟ࡘ࠸࡚
⚟ᓥ㎰⥲ࢭ ࠊᏛ⩦㝔኱⌮  ‫ۑ‬ᑠᯘᬛஅ ࠊ㰻⸨ㄔ୍ ࠊཎ᭷ ࠊᯇᮧᗣ⾜ ࠊ኱㔝๛ 

ᮾி㟁ຊ⚟ᓥ➨୍ཎᏊຊⓎ㟁ᡤࡢ஦ᨾ࡟క࠺ᨺᑕᛶ≀㉁ࡢᨺฟ࡟ࡼࡾࠊ㎰ᆅࡢởᰁࡀᘬࡁ㉳ࡇࡉࢀࡓࠋ⚟ᓥ┴ࡢ㎰స≀࡟ྵࡲࢀࡿᨺᑕᛶ≀㉁ࡢࣔࢽࢱࣜࣥࢢࡣࠊ஦ᨾ┤ᚋ࠿ࡽ⾜ࢃࢀࠊ⤖ᯝࡀබ⾲ࡉࢀ࡚࠾ࡾࠊ2011 ᖺ 7 ᭶௨㝆ࡑࡢ࡯࡜ࢇ࡝ࡣ୙᳨ฟ࡛࠶ࡿࠋࡇࡢࡼ࠺࡞஦౛ࡣࠊ
ከࡃࡢ㔝⳯㢮࡛ࡶ☜ㄆࡉࢀ࡚࠸ࡿࠋࡇࢀࡣࠊᨺᑕᛶ≀㉁࡟ởᰁࡉࢀࡓᅵተ࡛㔝⳯㢮ࢆ᱂ᇵࡋࡓ࡜ࡋ࡚ࡶࠊᅵተ࠿ࡽ᳜≀య࡬ࡢᨺᑕᛶ Cs ࡢ⛣⾜⛬ᗘࡣᴟࡵ࡚పࡃࠊ⛣⾜ಀᩘࡣ 0.0001㹼
0.005 ࡢ⠊ᅖ࡛࠶ࡿࡇ࡜࡟ࡼࡿࠋࡲࡓࠊ㔝⳯㢮࡟࠾࠸࡚ࡶ௚ࡢ㎰స≀࡜ྠᵝ࡟ࠊᅵተ୰ࡢ஺
᥮ᛶ K2O ྵ㔞ࡀ㧗ࡲࡿ࡜ࠊᨺᑕᛶ Cs ࡢ྾཰ࡀῶᑡࡍࡿࡇ࡜ࡀ᫂ࡽ࠿࡜࡞ࡗࡓࠋ
ࡋ࠿ࡋࠊ2011 ᖺ 3 ᭶᫬Ⅼ࡛ᆅୖ㒊࡟ⱼⴥࢆᒎ㛤ࡋ࡚࠸ࡓከᖺ⏕㔝⳯ࡢ୍㒊ࡣࠊởᰁࡢᙳ㡪ࡀ㛗ᮇ໬ࡋ࡚࠸ࡿࠋከᖺ⏕㔝࡛⳯࠶ࡿ⏿ࢃࡉࡧࡣࠊ┤᥋ỿ╔ࢆཷࡅࡓ 2012 ᖺ᥇ྲྀࡢᅾᅡᰴ࡟
ẚ࡭ࠊ᪂᳜ࡋࡓⱼⴥ࠾ࡼࡧ᰿ࡢᨺᑕᛶ Cs ⃰ᗘࡀ 80%௨ୖపୗࡋࡓࠋࡇࡢ⤖ᯝ࠿ࡽࠊ᳜≀య࡟┤᥋ỿ╔ࡋࡓᨺᑕᛶ Cs ࡣࠊ᳜≀యෆ࡬ྲྀࡾ㎸ࡲࢀ࡚࠸ࡿࡇ࡜ࡀ᥎ᐹࡉࢀࠊᅵተࢆ௓ࡋࡓ㛫᥋ⓗ࡞྾཰࡟ẚ࡭ࡿ࡜ࠊࡼࡾ῝้࡞ởᰁࢆᘬࡁ㉳ࡇࡍࡇ࡜ࢆ♧ࡍࡶࡢ࡛࠶ࡗࡓࠋ
㔝⳯㢮࡟࠾ࡅࡿᨺᑕᛶ Cs ࡢ᳨ฟ஦౛ࡢ୍㒊࡟ࡣࠊཎⓎ஦ᨾ┤ᚋࡢᨺᑕᛶ≀㉁ࡢ┤᥋ỿ╔ࡸᅵተ࡟㉳ᅉࡋ࡞࠸ࡶࡢࡀ࠶ࡿࠋࡑࡢ㸯ࡘࡣࠊཎⓎ஦ᨾᙜ᫬࡟౑⏝࠶ࡿ࠸ࡣᒇእ࡟⨨࠿ࢀ࡚࠸
ࡓᅬⱁ㈨ᮦࡢ෌฼⏝࡟ࡼࡿࡶࡢ࡛࠶ࡗࡓࠋཎⓎ஦ᨾ᫬࡟ಖ ⏝㈨ᮦ࡜ࡋ࡚౑⏝ࡋ࡚࠸ࡓ୙⧊
ᕸࢆࢥ࣐ࢶࢼ࡟⿕そࡋࠊࡑࡢୖ㒊࠿ࡽ℺Ỉࡋ᱂ᇵࡋࡓ࡜ࡇࢁࠊ᳜≀యࡢᨺᑕᛶ Cs ⃰ᗘࡣ㏻ᖖ
ࡢ᱂ᇵ࡟ẚ࡭ᴟ➃࡟㧗࠸್࡜࡞ࡗࡓࠋࡇࡢ୙⧊ᕸࡢษ∦࠿ࡽࡣࠊỈ࡛ᢳฟࡉࢀࡿ⁐Ꮡែᨺᑕᛶ Cs ࡀ᳨ฟࡉࢀࡓࠋ⁐Ꮡែᨺᑕᛶ Cs ࡢ⃰ᗘࢆኚ࠼ࢥ࣐ࢶࢼ࡬ࡢⴥ㠃ᩓᕸ࠾ࡼࡧᰴඖ₤Ỉฎ⌮ࡋࡓ࡜ࡇࢁࠊⴥ㠃ᩓᕸ࡛ࡣ᳜≀యࡢᨺᑕᛶ Cs ⃰ᗘࡀ⁐Ꮡែᨺᑕᛶ Cs ⃰ᗘ࡟ẚ౛ࡋ࡚ቑຍ
ࡋࠊ୍᪉ࡢᰴඖ℺Ỉ࡛ࡣࠊฎ⌮⃰ᗘ࡟ࡼࡽࡎప࠸ᨺᑕᛶ Cs ⃰ᗘ࡟࡜࡝ࡲࡗࡓࠋࡇࡢࡇ࡜࠿ࡽࠊ
ⴥ㠃࡬ࡢ⁐Ꮡែᨺᑕᛶ Cs ࡢ᥋ゐࡣࠊ᳜≀యෆ࡬ࡢྲྀࡾ㎸ࡳࢆᘬࡁ㉳ࡇࡍ㔜኱࡞ởᰁせᅉ࡜࡞ࡿࡇ࡜ࡀ᫂ࡽ࠿࡜࡞ࡗࡓࠋ
ࡑࡢ௚ࡢởᰁせᅉ࡜ࡋ࡚ࡣࠊ᱂ᇵ⎔ቃ࡟㉳ᅉࡍࡿࡶࡢࡀ࠶ࡆࡽࢀࡿࠋ⪏ᬬᛶࡢప࠸㔝⳯㢮ࡢ୍㒊ࡣࠊᒣ㛫㒊࡛᱂ᇵࡉࢀࡿࡶࡢࡶ࠶ࡿࠋࡑࡇ࡛ࠊởᰁࡉࢀࡓ⭉ⴥᅵྵ㔞ࢆኚ࠼࡚ࢥ࣐ࢶ
ࢼࢆ᱂ᇵࡋࠊᨺᑕᛶ Cs ࡢ྾཰ࡢ⛬ᗘ࡟ࡘ࠸࡚ㄪᰝࡋࡓࠋ᳜≀యࡢᨺᑕᛶ Cs ⃰ᗘࡣࠊ⭉ⴥᅵྵ㔞࡟ᛂࡌ࡚ቑຍࡋࡓࠋ1M 㓑㓟࢔ࣥࣔࢽ࣒࢘࡟ࡼࡾྛᅵተ࠿ࡽᢳฟࡋࡓ⤒᰿྾཰ࡍࡿྍ⬟ᛶࡀ࠶ࡿᨺᑕᛶ Cs ⃰ᗘࡣࠊ⭉ⴥᅵྵ㔞࡟ᛂࡌ࡚ቑຍࡋࠊởᰁ⭉ⴥᅵࢆྵࡴ⭉᳜ᒙࡀ᳜≀యࡢởᰁせᅉ࡜࡞ࡿྍ⬟ᛶࡀ♧ࡉࢀࡓࠋ ࡇࢀࡽࡢ㔝⳯㢮࡬ࡢᨺᑕᛶ Cs ࡢ྾཰⤒㊰ࡢゎ᫂ࡢ◊✲ࡣࠊ⌧ᅾࡶ⥅⥆୰࡛࠶ࡿࡶࡢࡢࠊ⌧ᆅ࡟࠾ࡅࡿᨺᑕᛶ Cs ࡢ྾཰ᢚไᑐ⟇࡜ࡋ࡚ᛂ⏝ࡉࢀ࡚࠸ࡿࠋ௒ᚋࡶࠊཎᏊຊ⅏ᐖ࠿ࡽࡢ᪩ᮇ
ࡢ᚟⯆ࢆ┠ᣦࡍ㑊㞴ᆅᇦࡸ㝖ᰁࡀᅔ㞴࡞ᒣᯘࢆᢪ࠼ࡿ୰ᒣ㛫ᆅᇦ࡛᱂ᇵࡉࢀࡿ㔝⳯㢮࡟࠾࠸
࡚ࠊᵝࠎ࡞⎔ቃ᮲௳࡟ᛂࡌࡓᑐ⟇ࢆㅮࡌ࡚࠸ࡃᚲせࡀ࠶ࡿࠋTransfer of radiocesium in vegetables.
T. T.
KOBAYASHI, T.,SAITO, S., HARA,Y.,MURAMATSU,Y. ,OHNO,
and OHNO,- 95 -

3A14

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Fig. 1. Concentrations of 137Cs and 40K in leaf
Þ0öYr|¶ñ-°Ä"Ôÿõ(ÿX - /  blade and petiole samples of giant butterbur.
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! «ÏÕ"Oö#ăî½4DK7N¯Ä`òæì®ÖU²í"T×å/.āÇÅĂTagami, K., Uchida, S., J. Radioanal. Nucl. Chem. 295, 1627-1634 (2013).

! ! ! ! ! ! Tsukada, H., Hasegawa, H., Hisamatsu, S., Yamasaki, S., Environ. Pollut. 117, 403-409 (2002).

Concentration Differences between Radiocesium and Potassium in Tissues of Herbaceous Plants
TAGAMI, K., UCHIDA, S.

- 96 -

3A15

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$JP ࡢࢧ࣒ࢥ࢖ࣥࢩࢹࣥࢫຠᯝ⿵ṇ㔠ἑ኱Ꮫ //5/ ‫ۑ‬὾ᓥ㟹඾䛆⥴ゝ䛇⤯ᑐ ᐃ࡛ᨺᑕ⬟ࢆồࡵࡿሙྜ㸪᳨ฟຠ⋡ࡀᚲ㡲࡜࡞ࡿࠋ࢝ࢫࢣ࣮ࢻ࣐࢞ࣥ⥺ࢆᨺฟࡍࡿ᰾✀ࡣ㸪ࡑࡢᨺᑕ⬟ࡢᙉᙅ࡟ࡼࡽࡎ㸪࡝ࡢࡼ࠺࡞ᆺࡢ Ge ᳨ฟჾ࡛ࡶࢧ࣒ࢥ࢖ࣥࢩࢹࣥࢫ
ຠᯝࡀᚲࡎ⾲ࢀ᳨ฟຠ⋡ࡢ⿵ṇࡀᚲせ࡜࡞ࡿࠋࢧ࣒ຠᯝࡢ⿵ṇ࡟ࡣቯኚᙧᘧ࡜࢝ࢫࢣ࣮ࢻࡍ
ࡿ࡯࠿ࡢ࣐࢞ࣥ⥺ࡢ඲ຠ⋡ࡀᚲせ࡜࡞ࡿࠋ඲ຠ⋡ࡣࣆ࣮ࢡຠ⋡ࢆồࡵࡿࡼࡾࡣࡿ࠿࡟ᅔ㞴࡞ࡓࡵ㸪㏻ᖖࡣ༢Ⰽ࣐࢞ࣥ⥺※ࢆ⏝࠸࡚ࣆ࣮ࢡ࣭ࢺ࣮ࢱࣝẚ࡛௦⏝ࡍࡿࠋࡋ࠿ࡋ㸪ᨺᑕ⥺⟶⌮༊ᇦእࡢ᪋タ࡛ࡣ㸪㐺ᙜ࡞༢Ⰽ࣐࢞ࣥ⥺※ࡀධᡭᅔ㞴࡞ࡓࡵ㸪ࣆ࣮ࢡ࣭ࢺ࣮ࢱࣝẚࢆồࡵࡿࡇ࡜ࡶᅔ㞴࡜࡞ࡿࠋ௒ᅇ㸪⟶⌮༊ᇦእ࡛ࡶ౑⏝࡛ࡁࡿᕷ㈍ࡢᐦᑒ⥺※࡞࡝ࢆ⏝࠸࡚඲ຠ⋡ࢆ᥎ᐃࡋ㸪ࢧ࣒ຠᯝࡢ⿵ṇࢆヨࡳࡓࠋ≉࡟㸪┦ᑐᙉᗘ ᐃࡀᅔ㞴࡞ Ag110m ࡢࢧ࣒⿵ṇ࡟ࡘ࠸࡚ሗ࿌ࡍࡿࠋ
㻌䛆ᐇ㦂䛇ィᩘຠ⋡ࡣ㸪᪥ᮏ࢔࢖ࢯࢺ࣮ࣉ༠఍〇ࡢᐦᑒᨺᑕ⬟ᶆ‽࣐࢞ࣥయ✚⥺※㸦Cd109, Co57,
Ce139, Cr51, Sr85, Cs137, Mn54, Y88, Co60㸧ࡢ 9 ᰾✀ΰྜ⥺※㸧Na22 ⥺※㸪AMS ⏝ Al-26 ⥺※ࢆ⏝࠸࡚ồࡵࡓࠋ࠙⤖ᯝ࡜⪃ᐹࠚ༢Ⰽࡶࡋࡃࡣ༢Ⰽ࣐࢞ࣥ⥺ᨺฟ࡜ࡳ࡞ࡉࢀࡿ᰾✀ࡢィᩘຠ⋡ࡣ㸪9 ᰾✀ΰྜ⥺※࠿ࡽồࡵࡓࡀ㸪Ce139, Y88, Co60 ཬࡧ Na22 ⥺※ࡣࢧ࣒ຠᯝࡀ࠶ࡾ㸪஭ᡞᆺ Ge ࡛ࡣྛࣆ࣮ࢡ㠃✚ࡀ 40-60%ࡶῶᑡࡋ㸪ຠ⋡᭤⥺సᡂ࡟౑⏝࡛ࡁ࡞࠸ࠋ
㸦ࡇࢀࡽ 4 ᰾✀ࡣ㸪ᖹᯈᆺ㸪ྠ㍈ᆺ Ge ࡛ࡶ 10-20%⛬ᗘࡣῶᑡࡋ㸪ྠᵝ࡟ຠ⋡᭤⥺సᡂ࡟౑⏝࡛ࡁ࡞࠸ࠋࡲࡓ㸪ప࢚ࢿࣝࢠ
࣮㡿ᇦࢆ᳨ฟ࡛ࡁࡿ Ge ࡢሙྜࡣ㸪X ⥺࡜ࡢࢧ࣒ຠᯝࢆ⪃៖ࡍࡿᚲせࡀ࠶ࡿሙྜࡶ࠶ࡿࠋ
㸧
Co-60 ࡢሙྜ㸪ྛῧ࠼Ꮠ࢚ࢿࣝࢠ࣮࡟ࡘ࠸࡚㸪Ȝ*ࢆᐇ ࡉࢀࡿぢ࠿ࡅࡢࣆ࣮ࢡຠ⋡㸪Ȝࢆࢧ࣒ࡢ↓࠸ࣆ࣮ࢡຠ⋡㸪T ࢆ඲ຠ⋡࡜ࡍࡿ࡜Ȝ*1.33㸻Ȝ1.33(1-T1.17)
Ȝ*1.17㸻Ȝ1.17(1-T1.33)

࡜⾲ࡏࡿࠋȜ*ࢆ Co60 ࡛ᐇ ࡋ㸪1.33㸪1.17MeV ࡢȜࢆ Ce139, Y88, Co60 ࡞࡝ࢆ౑⏝ࡏࡎ༢Ⰽ࣐࢞ࣥ
⥺※ࡔࡅࢆ⏝࠸࡚ồࡵࡿࡇ࡜ࡀ࡛ࡁࢀࡤ 1.33㸪1.17MeV ࡢ T ࢆ᥎ᐃࡍࡿࡇ࡜ࡀ࡛ࡁࡿࠋྠᵝ࡟ Y88 ࢆ⏝࠸࡚ 0.898㸪1.84MeV㸪Na22 ࢆ⏝࠸࡚ 0.511㸪1.27MeV ࡢ T ࢆ᥎ᐃ࡛ࡁࡿࠋࡇࡢࡼ
࠺࡟㸪ࢧ࣒⿵ṇ࡟ᚲせ࡞࢚ࢿࣝࢠ࣮⠊ᅖ࡛ࡑࢀࡒࢀࡢぢ࠿ࡅࡢࣆ࣮ࢡຠ⋡࠿ࡽ㸪ྛ࣐࢞ࣥ⥺࢚ࢿࣝࢠ࣮ࡢ඲ຠ⋡ࡢ᥎ᐃࡋ T ࡢ㏆ఝ᭤⥺ࢆసᡂࡍࡿࠋT ࡢ㏆ఝ᭤⥺ࡀỴࡲࢀࡤ඲࡚ࡢ࢞ࣥ
࣐⥺ࡢࢧ࣒ຠᯝ⿵ṇࡀྍ⬟࡜࡞ࡿࠋ඲ຠ⋡࠿ࡽ᥎ᐃࡋࡓ Cs134㸪Al26 ࡢྛࣆ࣮ࢡࡢぢ࠿ࡅࡢຠ⋡࡜ᐇ ࡋࡓぢ࠿ࡅࡢຠ⋡ࡣࡼࡃ୍⮴ࡋ࡚࠸ࡓࠋࡇࡢ T ࡢ㏆ఝ᭤⥺ࢆ⏝࠸࡚ Ag110m ぢ࠿ࡅࡢຠ⋡ࡶ᥎ᐃࡋࡓࠋAg110m ࡢᐦᑒ⥺※ࡀධᡭ࡛ࡁࢀࡤᐇ ್࡜ࡢẚ㍑ࡶሗ࿌ࡍࡿࠋ

Correction of Sum coincidence effect using total efficiency- Sum Coincidence effect correction for Ag110m HAMAJIMA, Y.

- 97 -

3A16⡆␎໬ࢧ࣒ࣆ࣮ࢡἲࡢ㛤Ⓨྡ኱㝔་ ࠊᒱ㜧་⒪኱ ࠊྡᕷ኱་ ࠊឡ▱་኱  ‫⥴ۑ‬᪉Ⰻ⮳ ࠊᐑཎὒ ࠊ▼ཎṇྖ ࠊ▼ᴯಙே ࠊᒣᮏㄔ୍ ࠊᑠᓥ㈆⏨ 䛆⥴ゝ䛇㻌 sum-peak ἲࡣࠊᨺᑕ⬟ࡢ⤯ᑐ ᐃἲࡢ୍ࡘ࡛ࠊ㸯ቯኚ࡛㸰ᮏ௨ୖࡢගᏊࢆᨺฟࡍࡿ᰾
✀࡟㐺⏝ྍ⬟࡛࠶ࡿࠋpeak ィᩘ⋡ࠊsum-peak ィᩘ⋡࠾ࡼࡧ඲ィᩘ⋡࠿ࡽᨺᑕ⬟ࢆィ⟬ࡍࡿࠋࡋ࠿ࡋࠊ ᐃᑐ㇟࡟௚ࡢ᰾✀ࡀΰᅾࡋ࡚࠸ࡿሙྜࠊ඲ィᩘ⋡ࡢホ౯ࡀᅔ㞴࡛࠶ࡾࠊsum-peakἲࡢ㐺⏝ࡣ㞴ࡋ࠸ࠋࡑࡇ࡛ࠊpeak ィᩘ⋡࡜ sum-peak ィᩘ⋡ࡢࡳ࡛ィ⟬ࡍࡿ᪉ἲࢆ⪃᱌ࡋࠊࡑࡢ㐺⏝ྍ⬟ᛶࢆ⌮ㄽⓗ࣭ᐇ㦂ⓗ࡟᳨ドࡋࡓࠋ
N2 ࢆྛࠎࡢȚ⥺ࡢ peak䛆⌮ㄽ䛇 ࠶ࡿ᰾✀ࡀ㸰ᮏࡢȚ⥺(!1, !2)ࢆ࢝ࢫࢣ࣮ࢻ࡟ᨺฟࡍࡿሙྜࠊN1ࠊ
ィᩘ⋡ࠊN12 ࢆ sum-peak ࡢィᩘ⋡ࠊNT ࢆ඲ィᩘ⋡ࠊ w (0) ࢆゅ┦㛵࡜ࡍࡿ࡜ࠊᨺᑕ⬟(N0)ࡣࠊ
ḟᘧ࡛ィ⟬ࡍࡿࡇ࡜ࡀ࡛ࡁࡿ(Brinkman et al1)ࠋ
)N N
&
N N
N 0 # ' 1 2 " N T $ w (0) # 1 2 w (0) " N T w (0) # R " T
N 12( N 12%(1)ࡇࡢᘧ࡛ࠊT 㡯ࡣࠊ᳨ฟჾ࡜⥺※ࡢ㊥㞳ࡢ㏫஧஌࡟࡯ࡰẚ౛ࡋࠊ㊥㞳ࡀ㞳ࢀࡿ࡜ῶᑡࡍࡿࠋ
୍᪉ࠊR 㡯ࡣࠊ㊥㞳ࢆ㞳ࡋ࡚ࡶῶᑡࡋ࡞࠸ࠋN0 ࡣཎ⌮ⓗ࡟୍ᐃ࡛࠶ࡿࠋࡋࡓࡀࡗ࡚ࠊ㊥㞳ࡀቑࡍ࡟ᚑࡗ࡚ N0 ࡟༨ࡵࡿ R ࡢ๭ྜࡀቑ࠼ࠊT ࡢ๭ྜࡀῶࡿࠋ㊥㞳Ѝ࡛҄ N0 = R ࡜࡞ࡿࠋࡑ
ࡇ࡛ࠊᘧ(1)࠿ࡽ NT ࢆ㝖ࡁ
N '0 #

N1 N 2
w (0)
N 12

(2)

1)

Brinkman GA, et al., Int. J Appl. Radiat. Isot, 14: 153-157 (1963) etc

Development of the modified sum-peak method
OGATA. Y., MIYAHARA, H., ISHIHARA, M., ISHIGURE, N., YAMAMOTO, S., KOJIMA, S.

- 98 -

Co activity (Bq)60

22

Na activity (Bq)ࢆᑟ࠸ࡓࠋ㊥㞳ࡀ㞳ࢀࡿ࡟ᚑ࠸ࠊN’0 ࡣ N0 ࡟㏆࡙ࡃࠋ(2)ᘧ࡛ࡣ peak ィᩘ⋡࡜ sum-peak ィᩘ⋡ࡢࡳ࡛ィ⟬ྍ⬟࡛࠶ࡿࡓࡵ௚ࡢ᰾✀ࡀΰᅾࡍࡿヨᩱ࡬ࡢ㐺⏝ࡀྍ⬟࡛࠶ࡿࠋ(2)ᘧࢆ⏝࠸࡚ᨺᑕ⬟ࢆィ⟬ࡍࡿ᪉ἲࢆ⡆␎໬ࢧ࣒ࣆ࣮ࢡ(modified sum-peak)ἲ࡜ྡ௜ࡅࡓࠋ
䛆ᐇ㦂䛇 ᐇ㦂ࡣࠊ┦ᑐຠ⋡(RE) 40%࡜ 25%ࡢ HP-Ge ᳨ฟჾࢆ⏝࠸࡚⾜ࡗࡓࠋ22Naࠊ60Co ࡢᶆ‽⁐ᾮ࠿ࡽࠊձⅬ⥺※ࠊղయ✚⥺※ࢆస〇ࡋࠊ⥺※㸫᳨ฟჾ㛫㊥㞳ࢆኚ࠼࡚ィ ࡋࡓࠋ
N1 (60Co)䛆⤖ᯝ䛸⪃ᐹ䛇 Fig. 1 ࡟ RE 40%ࡢ᳨ฟჾ࡛ 22Na ࡜
600
400
200
0
40
40
60
Co ࡢⅬ⥺※ࢆྠ᫬࡟ ᐃࡋࡓ౛ࢆ♧ࡍࠋᶓ㍈(ୗ)ࡣ 22Na ࡢ peak ィᩘ⋡ N1ࠊᶓ㍈(ୖ)ࡣ 60Co ࡢ peak
30
30
60
ィᩘ⋡ N1㸦㏫┠┒㸧ࠊ⦪㍈(ᕥ)ࡣ 22Na ࡢᨺᑕ⬟ࠊ⦪
Ћ22Na
CoЍ
㍈(ྑ)ࡣ 60Co ࡢᨺᑕ⬟࡛࠶ࡿࠋヨᩱ㸫᳨ฟჾ㛫㊥㞳
20
20ࡀቑࡍ࡟ࡋࡓࡀࡗ࡚ N1 ࡣῶᑡࡍࡿࠋᩘⅬࡢࣉࣟࢵ
10
10
እᤄ್ࡣࠊ
ࢺ࠿ࡽ N1 = 0 ࡢ఩⨨࡛ࡢ N’0 ࢆእᤄࡋࡓࠋ
0
500
1000
1500
2000
22
ࡑࢀࡒࢀࡢ᰾✀ࡢᨺᑕ⬟࡜୍⮴ࡋࡓࠋ௚ࡢ᰾✀ࡀΰ
N1 ( Na)ᅾࡋ࡚࠸࡚ࡶᨺᑕ⬟ࢆィ⟬࡛ࡁࡿࡇ࡜ࡀศ࠿ࡿࠋయ
✚⥺※࡛ࡶྠᵝࡢ⤖ᯝࢆᚓࡓࠋ⡆␎໬ࢧ࣒ࣆ࣮ࢡἲ
Fig. 1. Measurement of 22Na and 60Co at once.
ࡣࠊࢩࣥࣉࣝ࡞Ț⥺᳨ฟჾ㸯ྎ࡛ᐇ⾜ࡍࡿࡇ࡜ࡀྍ
⬟࡛࠶ࡾࠊィ⟬ᘧࡶ⡆౽࡛ࠊࡁࢃࡵ࡚ᐇ⏝ⓗ࡞᪉ἲ࡛࠶ࡿࡇ࡜ࡀ♧ࡉࢀࡓࠋ

3A17

134Cs ᨺᑕ⬟ࡢᐃ࡬ࡢࢧ࣒ࣆ࣮ࢡἲࡢ㐺⏝ྡ኱㝔་ ࠊᒱ㜧་⒪኱ ࠊྡᕷ኱་ ࠊឡ▱་኱  ‫⥴ۑ‬᪉Ⰻ⮳ ࠊᐑཎὒ ࠊ▼ཎṇྖ ࠊ▼ᴯಙே ࠊᒣᮏㄔ୍ ࠊᑠᓥ㈆⏨ Activity (kBq)䛆⥴ゝ䛇㻌 134Cs ࡣ㸯ቯኚ࡛ 10 ᮏ௨ୖࡢȚ⥺ࢆᨺฟࡍࡿࡓࡵ sum-peak ἲࡢ㐺⏝ࡣ࠿࡞ࡾ↹㞧࡛࠶ࡿࠋࡇࡢࡓࡵࠊ134Cs ࡢᨺᑕ⬟ ᐃ࡬ࡢ㐺⏝౛ࡣ࠶ࡲࡾሗ࿌ࡉࢀ࡚࠸࡞࠸ࠋᮏ◊✲࡛ࡣࠊᚑ᮶ࡢ sum-peak ἲ࠾ࡼࡧᡃࠎࡀ㛤Ⓨࡋࡓ modified sum-peak ἲࢆ⏝࠸࡚ 134Cs ࡢᨺᑕ⬟ࢆホ౯ࡍࡿࡇ࡜ࢆヨࡳࡓࠋ
䛆᪉ἲ䛇㻌 ┦ᑐィᩘຠ⋡(RE) 40%࡜ 25%ࡢྠ㍈ᆺ HP-Ge ᳨ฟჾ࠾ࡼࡧ well ᆺ Ge ᳨ฟჾࢆ⏝࠸ࡓࠋྠ㍈ᆺ࡛ࡣヨᩱ࡜᳨ฟჾࡢ㊥㞳ࢆኚ࠼࡚ィ ࡋࡓࠋ134Cs ᶆ‽⁐ᾮ࠿ࡽࠊձⅬ⥺※ࠊղయ✚⥺※㸦U8 ᐜჾ㸧ࠊճయ✚⥺※㸦RIA ࢳ࣮ࣗࣈ㸧ࢆస〇ࡋࡓࠋ137Cs ࡜ࡢྠ᫬ ᐃࡶヨࡳࡓࠋ⚟ᓥ࡛᥇ྲྀࡋࡓᅵተࢆ ᐃࡋࡓࠋࡉࡽ࡟ࠊ୙ᆒ୍ศᕸ⥺※ࢆ ᐃࡋࡓࠋ䛆⤖ᯝ䛸⪃ᐹ䛇 Fig. 1 ࡟ RE40%ࡢ Ge ᳨ฟჾ࡛ࡢ 134Cs
Ⅼ⥺※ࡢ ᐃ⤖ᯝࢆ♧ࡍࠋᶓ㍈ࡣ 605 keV ࡢȚ⥺ࡢA0㻌
ࣆ ࣮ ࢡ ィ ᩘ ⋡ (N(605)) ࠊ ⦪ ㍈ ࡣ ᨺ ᑕ ⬟ ࡛ ࠊ N0 ࡣ
10N0㻌
sum-peak ἲ࡛ࡢィ⟬⤖ᯝࠊN’0 ࡣ modified sum-peakN’0㻌
ἲ࡛ࡢィ⟬⤖ᯝࠊA0 ࡣ⥺※ࡢᨺᑕ⬟ࢆ♧ࡍࠋN(605)ࡣࠊ⥺※㸫᳨ฟჾ㛫㊥㞳ࡢ㏫஧஌࡟࡯ࡰẚ౛ࡋ࡚ῶ
5ᑡࡍࡿࠋᅗ࠿ࡽ᫂ࡽ࠿࡞ࡼ࠺࡟ N0 ࡣ࡝ࡢ఩⨨࡛ࡶ
A0 ࡜୍⮴ࡋࡓࠋ୍᪉ࠊN’0 ࡣ N(605) = 0 ࡢⅬ࡟እᤄࡍࡿ࡜ A0 ࡜୍⮴ࡋࡓࠋ134Cs ࡢᨺᑕ⬟Ỵᐃ࡟ sum-peak
0
0
100
200
300
400
ἲࡀ㐺⏝ྍ⬟࡛࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ
N(605) (cps)134
Cs ࡜ 137Cs ࡢྠ᫬ ᐃ࡟ࡣ modified sum-peak ἲ
Fig. 1. Change in N0 and N’0 versus N(605)..
ࢆ㐺⏝ࡋࡓࠋ134Cs ࡢィ⟬⤖ᯝ㸦N(605) = 0 ࡛ࡢ N’0 ࡢእᤄ್㸧ࡀ⥺※ࡢᨺᑕ⬟࡜୍⮴ࡍࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ ⚟ᓥ࡛᥇ྲྀࡋࡓᅵተࢆձmodified sum-peak ἲ࠾ࡼࡧղᅵተᶆ‽⥺※࡜ࡢẚ㍑ ᐃἲ࡛ ᐃࡋࡓ⤖ᯝࠊ୧⪅ࡢ⟬ᐃ⤖ᯝࡣ୍⮴ࡋࡓࠋ୍᪉ࠊࢥ࢖ࣥࢩࢹࣥࢫࢧ࣒ຠᯝࡢ⿵ṇࢆ⾜ࢃ࡞࠸ሙྜࡣ 8%ࡢ㐣ᑠホ౯࡛࠶ࡗࡓࠋ
well ᆺ Ge ᳨ฟჾ࡛ࡣ RIA ࢳ࣮ࣗࣈධࡾࡢయ✚⥺※ࢆ ᐃࡋࡓࠋsum-peak ἲࢆ㐺⏝ࡋ࡚ィ⟬ࡋࡓ⤖ᯝࠊ⥺※ࡢ㧗ࡉࡀ well ࡢ῝ࡉࢆ㉸࠼࡞࠸ሙྜࠊィ⟬್ࡣᨺᑕ⬟࡜Ⰻࡃ୍⮴ࡋࡓࠋ⥺※ࡢ㧗ࡉࡀ well ࡢ῝ࡉࢆ㉸࠼ࡓሙྜࠊ㐣ᑠホ౯࡜࡞ࡗࡓࠋ
134
Cs ࡀ୙ᆒ୍࡟ศᕸࡋ࡚࠸ࡿ U8 ᐜჾ≧ࡢ⥺※࡟࠾࠸࡚ࡶ N’0 ࡣ A0 ࡟཰ᩡࡍࡿࡇ࡜ࡀศ࠿
ࡗࡓࠋࡇࢀ࡟ࡼࡾࠊmodified sum-peak ἲࡣࠊin vivo ᳨ᰝࡸ in situ ᳨ᰝ࡞࡝ࠊ⥺※ࡢᆒ୍ᛶࡀ
୙࡛᫂࠶ࡿヨᩱࡢ ᐃ࡟ࡶ㐺⏝ྍᛶࡀ࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ
modified sum-peak ἲ࡛ࡣࠊ」ᩘࡢ᰾✀ࡀΰᅾࡋ࡚ࡶࠊᶆ‽⥺※࡟㢗ࡽࡎ࡟ヨᩱࡢᨺᑕ⬟ࢆᐃ࡛ࡁࡿࠋ134Cs ࡢᨺᑕ⬟ࡀ sum-peak ἲ࡛ ᐃ࡛ࡁࡿࡇ࡜ࢆᐇドࡋࡓࠋ

Application of the sum-peak method to 134Cs activity measurement
OGATA. Y., MIYAHARA, H., ISHIHARA, M., ISHIGURE, N., YAMAMOTO, S., KOJIMA, S.

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3B01

EPMA ࡟ࡼࡿ U-Th-Pb ⣔ CHIME ᖺ௦ᐃࡢ㧗⢭ᗘ໬ࡢࡓࡵࡢ⿵ṇィ⟬ࣔࢹࣝࡢホ౯
ྡ኱ᖺ‫ۑ‬ຍ⸨୔඾

 U ཬࡧ Th ࡣᨺᑕቯኚ࡟ࡼࡾ Pb ࡜࡞ࡿࠋCHIME ᖺ௦ ᐃࡣࡇࡢቯኚ⣔ิࢆ⏝࠸ࡿ໬Ꮫᖺ௦
ᐃἲ࡛ࠊ㟁Ꮚࣉ࣮ࣟࣈ࣐࢖ࢡࣟ࢔ࢼࣛ࢖ࢨ࣮㸦EPMA㸧ࢆ⏝࠸ࡿࡇ࡜࡟ࡼࡾ 1 ࣑ࢡࣟࣥ⛬ᗘࡢᚤᑠ㡿ᇦࡢᖺ௦ ᐃࡀྍ⬟࡛࠶ࡿࠋṇ☜࡞ CHIME ᖺ௦ࢆᚓࡿࡓࡵ࡟ࡣࠊUࠊThࠊཬࡧPb ࡢ⃰ᗘẚࢆṇ☜࡟ ᐃࡍࡿࡇ࡜ࡀᚲせ࡛࠶ࡿࠋࡍ࡞ࢃࡕࠊEPMA ᐃ㔞ศᯒࡢ୙☜࠿ࡉࡀ
CHIME ᖺ௦ࡢ୙☜࠿ࡉ࡟ᙳ㡪ࡍࡿࠋ EPMA ᐃ㔞ศᯒࡢ୙☜࠿ࡉࡣࠊX ⥺ィᩘࡸᶆ‽≀㉁ࡢ⃰ᗘࡢ୙☜࠿ࡉ࡟ຍ࠼ࠊ⏝࠸ࡿ⿵ṇィ⟬ࣔࢹࣝࡢ୙☜࠿ࡉ࡟ࡶ౫Ꮡࡍࡿࠋࡑࡇ࡛ࠊEPMA ᐃ㔞ศᯒ࡛ᗈࡃ⏝࠸ࡽࢀ࡚࠸ࡿ⿵ṇィ⟬ࣔࢹࣝࢆホ౯ࡋࡓࠋࡑࡢ⤖ᯝࠊArmstrong[1]࡟ࡼࡿⓎ⏕㛵ᩘࣔࢹࣝ࡜ Love et al.[2]࡟ࡼࡿཎ
Ꮚ␒ྕ⿵ṇࣔࢹࣝࢆ⏝࠸ࡓሙྜࡣ UࠊThࠊPb ࡢ⃰ᗘẚࡀ୙ṇ☜࡟࡞ࡿࡢ࡟ᑐࡋࠊPouchou &Pichori[3]ࡢ⿵ṇィ⟬ࣔࢹࣝࢆ⏝࠸ࡿ࡜ṇ☜࡞⃰ᗘẚࡀᚓࡽࢀࡿࡇ࡜ࡀ᫂ࡽ࠿࡟࡞ࡗࡓࠋࡇࢀ
ࡣࠊArmstrong[1]ࡢࣔࢹࣝࡀ⏝࠸࡚࠸ࡿ surface-center Gaussian ࣔࢹࣝࡢᩘᏛⓗไ㝈࡜ࠊLove etal.[2]ࡢᚋ᪉ᩓ஘⿵ṇࣔࢹࣝࡀ UࠊTh ཬࡧ Pb ࡟᭱㐺໬ࡉࢀ࡚࠸࡞࠸ࡇ࡜ࡀཎᅉ࡛࠶ࡿ࡜⪃࠼
ࡽࢀࡿࠋ
㻌
ᘬ⏝ᩥ⊩
[1] Armstrong, J.T. (1991) In: Electron Probe Quantitation, Heinrich, K.F.J. & Newbury, D.E. (eds),
Plenum Press, New York, 261 – 315.
[2] Love, G., Cox, M.G. & Scott, V.D. (1978), J. Phys. D, 11, 7 – 21.
[3] Pouchou, J.L. & Pichoir, F. (1991) In: Electron Probe Quantitation, Heinrich, K.F.J. & Newbury,
D.E. (eds), Plenum Press, New York, 31 – 75.

Validation of matrix correction models in quantitative EPMA for accurate Chemical U-Th-total Pb
Isochron Method (CHIME) dating
KATO T.

- 100 -

- 101 -

3B13
3B03

ᅵჾ௜╔Ⅳ໬≀Ⅳ⣲ᖺ௦ ᐃἲ㻌䠉ෆ㠃䛸እ㠃䛻௜╔䛩䜛Ⅳ໬≀䛾໬Ꮫ⤌ᡂ䛸㉳※䠉㻌㔠኱ //5/ࠊ໭኱ᇙᩥㄪᰝᐊ ࠊᅜ㝿ᇶ╩ᩍ኱Ꮫ ࠊṔ༤ ࠊᮾ኱༤≀㤋  ‫ۑ‬ᐑ⏣ెᶞ ࠊ㐲㒊ៅ ࠊᇼෆᬗᏊ ࠊᆏᮏ⛱ ࠊᯇᓮᾈஅ ࠊ௒ᮧᓟ㞝  ᅵჾࡢෆእ㠃࡟௜╔ࡋࡓⅣ໬≀ࢆⅣ⣲ᖺ௦ ᐃࡍࡿࡇ࡜࡟ࡼࡗ࡚㸪ᅵჾࢆ౑⏝ࡋࡓ᫬௦ࢆ
᥎ᐃࡍࡿࡇ࡜ࡀ࡛ࡁࡿࠋ⦖ᩥ᫬௦᪩ᮇࡢྠ୍ಶయᅵჾࡢ」ᩘ⟠ᡤ࡟௜╔ࡋࡓⅣ໬≀㸦ෆ㠃࡟௜╔ࡋࡓࢥࢤ㸦㣗≀㉳※㸧࡜እ㠃࡟௜╔ࡋࡓࢫࢫ㸦⇞ᩱᮦ㉳※㸧
㸧ࡢⅣ⣲ᖺ௦ ᐃ⤖ᯝ࡟ࡣ㸪 Ⅳ⣲ᖺࡢᖺ௦ᕪࡀ࠶ࡗࡓࠋᮏ◊✲࡛ࡣⅣ⣲ᖺ௦ࡢࣜࢨ࣮ࣂ࣮ຠᯝࡸෆእ㠃Ⅳ໬≀ࡢ⬡㉁⤌ᡂࢆྵࡴ໬Ꮫ⤌ᡂࡢほⅬ࠿ࡽ㸪ᅵჾ௜╔Ⅳ໬≀ࡢⅣ⣲ᖺ௦ ᐃ್ࡢ♧ࡍព࿡࡟ࡘ࠸࡚⪃࠼࡚ࡳࡿࠋ⍇⍈†ἢᓊࡢධỤෆ†㑇㊧࠿ࡽฟᅵࡋࡓྠ
୍ಶయ㸶◚∦ࡢᅵჾ௜╔Ⅳ໬≀ࡢෆ㸪እ㠃௜╔≀ࢆⅣ⣲ᖺ௦ ᐃࡋࡓ࡜ࡇࢁ㸪ෆ㠃௜╔≀ࡢᖺ௦㸦s%31 㸧ࡀእ㠃௜╔≀ࡢᖺ௦㸦s%31 㸧ࡼࡾࡶ㸪⣔⤫ⓗ࡟ s&\UVྂ࠸್ࢆ♧ࡋࡓࠋෆ㠃௜╔≀ࡢⅣ⣲ྠ఩య⤌ᡂࢆ ᐃࡋࡓ࡜ࡇࢁ㸪ᾏὒࣜࢨ࣮ࣂ࣮ຠᯝࡢྍ⬟ᛶࡀ࡯࡜ࢇ࡝⪃࠼ࡽࢀ࡞࠸ࡓࡵ㸪ࡑࡢⅣ⣲ᖺ௦ᕪࡀ⏕ࡌࡿཎᅉࡢ୍ࡘ࡜ࡋ࡚㸪⍇⍈†⏘㨶௓㢮ࢆ↻⅕ࡁࡋࡓ㝿࡟⏕ࡌࡿῐỈࣜࢨ࣮ࣂ࣮ຠᯝࡢ
ྍ⬟ᛶࢆᣦ᦬ࡋࡓ㸦ᐑ⏣௚㸪㸧 ᅵჾእ㠃ࡢࢫࢫ࡛࠶ࡿ 6*0%E ࡢ໬Ꮫ⤌ᡂࡣ㸪ࡑࢀ௨እࡢእ㠃௜╔Ⅳ໬≀ࡢ໬Ꮫ⤌ᡂ࡜ఝ࡚࠸ࡿࡀ㸪ࡋ࠿ࡋ㸪$$$ ฎ⌮ᚋࡢࡇࡢ௜╔Ⅳ
໬≀ࡢⅣ⣲ᖺ௦
⣲ᖺ௦ᐃ್ࡣෆ㠃ᅵჾ௜╔≀ࡢⅣᐃ್࡟ఝ࡚࠸ࡓࠋࡲࡓ㸪$$$ ฎ⌮๓ࡣ㸪6*0%E ࡢ໬Ꮫ⤌ᡂࡣ㸪ෆ㠃ࡢࡑࢀ࡟ఝ

࡚࠸ࡓࠋࡇࡢ௜╔Ⅳ໬≀ࡣ㣗ᮦࡢ୍㒊ࡀᅵჾእ㠃࡟௜╔ࡋ࡚↔ࡆࡓྍ⬟ᛶࢆ♧ࡋ࡚࠸ࡿࠋࡘ
ࡲࡾ㸪ᅵჾእ㠃࡟ṧࡿ͆྿ࡁࡇࡰࢀ͇࡜࠸࠺ㄪ⌮⌧㇟ࡀ㸪ࡇࡢ 6*0%Eࡢ໬Ꮫ⤌ᡂ࡟ࡼࡗ࡚㸪ㄝ࡛᫂ࡁࡿ࠿ࡶࡋࢀ࡞࠸ࠋ

㸨$$$ ฎ⌮ ࡲࡎ㸪ᅵჾ௜╔Ⅳ໬≀ࢆሷ㓟࡛Ὑίࡋ㸪Ⅳ㓟ሷࢆ㝖ཤࡍࡿࠋḟ࡟㸪Ỉ㓟໬ࢼࢺ࣒ࣜ࢘Ỉ⁐ᾮ࡛ฎ⌮ࡋ㸪ࣇ࣑ࣥ㓟࡞࡝ࡢᅵተ㉳※᭷ᶵ≀ࢆ㝖ཤ㸪᭱ᚋ࡟㸪෌ᗘሷ㓟࡛ฎ⌮ࡋ㸪Ỉ㓟໬ࢼࢺ࣒ࣜ࢘ࢆ୰࿴ࡍࡿᅵჾ௜╔Ⅳ໬≀ࡢఏ⤫ⓗ࡞Ὑίἲࠋ

Radiocarbon dating of carbonized material attached to pottery: implications of chemicalcomponent of inner and outer surfaces on potsherds.
MIYATA, Y., ONBE, S., HORIUCHI, A., SAKAMOTO, M., MATSUZAKI, H., IMAMURA, M.

- 102 -

3B04!"## $ !%&'#() *+,-./0123456789:;6<=>!"#$%&'()*+$,-./01-23456

Normalized to recommended values!"#$
789:;<=>?@ABCDEFGHIDJKLMNO-=PQ%ID<RSTUVDJ!WXMYZ["#\<=PQ%I]^_` V `abc$?%&defYM=P`gQ'h
D(LM`)i*jkXMYZ (Nielsen et al, 2014)[+X,\` V `ld< ICP-AES, ICP-MS,
NAA, AAS, XRF m--.nm/o\JpWXMqr[L0L-ICP-AES D(LM<smZJ
p1tefYkXMYZru-Jp2`34TvwYxYy567v8WXMYZ[9+\:z;\<=PQ%I{<]^efYM-INAA \=|mJp2e>uZxx*D-V `ldD}Lr ICP-AES `Jp1te?l~Z+xe]r[!%&$[INAA] @ 50mg `ASBC]^(JB-1, JB-2, JB-3)e 1cm1cm `DEFGHIAJDK
Lr[9Xe'#$%4L M` pn-3N_TO; 4.61012/cm2/s, _TO; 9.61011/cm2/s\ 10 -_Ter[4f V ]P(1000Qg/g)0k 100Qg JR
L-STDULr*`e$V{<]^xLr[[ICP-AES] ASBC]^ 20-30mg eWAJXDRO-HF-HNO3-HClO4 efYMY
JeY-"ZIDJ[e\Y]D^_Lr[^_Lr[0kH`JRL-abLcdef@Jp\ V `lder[ICP-AES `ghQ< Lu \i=Lr[!'()*+$
JB-1, JB-2, JB-3 ` INAA DZld2< 6% j\kl2xH¡Lr[ICP-AES \` V `ldD< 292.402nm, 310.230nm x 311.071nm ` 3 m`Jp1tefYrene$VLr[
292.402nm x 311.071nm D< Ti `Jopv-310.230nm D< Ar qr`Jopv¢Z+x
vJ0r[Jopi=s` 3 m`Jp1t0kjkXrld2<-10% j\kl2xH¡Lrt 1[311.071nm \` Ti `J
1.4
ICP-AES (292.402nm)
INAA
op`h< 292.402nm D$u 10 v
h$qw-,r 310.230nm `Jp1tx
1.3
ICP-AES (310.230nm)
GSJ (ICP-AES)y`7£¤¥:Az< Ar ¦§¤`{ICP-AES (311.071nm)
1.2|e}¨-wmMYr[~Lr 3
m`Jp1t\`~<-9XX
1.1
0.75ppm(292.402nm), 3.5ppm(310.230nm),
10.96ppm(311.071nm)\¢r[~xJop`qr©eªLM0.9
292.402nm v V `ldD}Lr1t\¢
Z+xvJ0r[WkD ICP-AES `~0.8
< INAA `~(25ppm)x$
0.7
uM-@ 7~30 vwY+xvJ0r[

0.6
t 1.6

JB-1

JB-2

JB-3

Jp2(ICP-AES, INAA)xkl2x`$V

Determination of V in geological reference samples by INAA and ICP-AES
TAKAHASHI, H., SHIRAI, N., EBIHARA, M.

- 103 -

3B05

Multielement analysis of NIST and IAEA reference materials(NIST-1646a, NIST-1400, IAEA-450 and IAEA-395) by INAA, ICP-AES
and ICP-MS
53'4-) !&(%01* &(%01* !" 

!"

! !"!""! "!"

! .#/+ ,2&$ !

Introduction Certified reference materials (CRMs) are greatly important in chemical analysis. They
can be used as reference standard or quality control samples. A survey of literatures reveals that the
number of published values for NIST-1400 (Bone Ash), IAEA-450 (Algae) and IAEA-395 (Urban
Dust) is very limited. Certified values are available for eight elements, seven elements for NIST-1400
and IAEA-450, respectively, but no certified value are given for IAEA-395 at present. In this study,
three analytical methods (INAA, ICP-AES and ICP-MS) were used for the determination of a wide
range of major, minor and trace elements of three CRMs (NIST-1400, IAEA-450 and IAEA-395).
Besides these three CRMs, NIST-1646a (Estuarine Sediment) was analyzed as a quality control
sample to estimate the accuracy and precision of our analytical data.
Experimental INAA - INAA was done at the Nuclear Research Reactor in Dalat, Vietnam.
NIST-1400 and IAEA-395, and IAEA-450 weighing 30-50 mg were irradiated for 45 seconds and 5
minutes, respectively. For long irradiation, 100 mg of each sample was used for 10 hours irradiation.
ICP-AES and ICP-MS - Around 30-500 mg of each sample was acid-digested. The solution was used
for the determination of rare earth elements (REE), Th and U abundances by ICP-MS, and for major
elements by ICP-AES.
Results and Discussion NIST-1646a - Alminium, Ca, Fe, Mg, Mn and Ti values were determinedby both INAA and ICP-AES. Our data obtained by these two methods are in excellent agreement witheach other and also with certified values except for Mg. The data for Mg abundances determined by
INAA had interference from 27Al(n,p)27Mg reaction. Its contribution (up to 70%) was corrected, but
the data quality was not satisfactory. The elemental abundances of some REE (La, Ce, Sm, Eu andDy) and Th abundances determined by both INAA and ICP-MS are consistent with each other, andinformation and literature values.
NIST-1400, IAEA-395 and IAEA-450 – Twenty seven,28 and 39 elements were determined for NIST-1400,
IAEA-450 and IAEA-395, respectively, by INAA,
ICP-AES and ICP-MS. Figure 1 shows CI chondritenormalized REE abundance patterns for NIST-1400
and IAEA-395. Our data for these samples are in good
agreement with literature values. Although absolute
REE abundances are different, CI-normalized REE
abundances patterns are similar to each other and evento those of continental crustal materials.
Multielemental analysis of NIST and IAEA reference materials (NIST-1646a, NIST-1400, IAEA-450
and IAEA-395) by INAA, ICP-AES and ICP-MS
VU, C. D., RAYMOND, S., THIEN, T. Q., DOANH, H. V., SHIRAI, N. EBIHARA, M.

- 104 -

3B06

ኅᐸ↪䉝䊦䊚▗䈱ਛᕈሶ᡼኿ൻಽᨆ㵪Ყセᴺ䈫 㫂㪇㪄㪠㪘㪜㪘 ᴺ䈱Ყセ㵪㩷 㩷㚂ㇺᄢ㒮ℂᎿ ٤ਃᶆ⟵㓉‫ޔ‬ᄢᶆᵏ༹䇼䈲䈛䉄䈮䇽㩷 ㅢᏱ‫ޔ‬ਛᕈሶ᡼኿ൻಽᨆߢߪᲧセᴺߦࠃࠅర⚛ߩቯ㊂߇ⴕࠊࠇ‫ޔ‬ቯ㊂ߒߚ޿ోర
⚛ߦߟ޿ߡᲧセᮡḰ⹜ᢱࠍḰ஻ߔࠆᔅⷐ߇޽ࠆ‫৻ޕ‬ᣇ‫ޔ‬k0 ᴺߪ 1 ర⚛ߩࠦࡦࡄ࡟࡯࠲ࠍหᤨ
ߦᾖ኿ߔࠆߎߣߢ‫ޔ‬γ ✢߇ᬌ಴ߐࠇߚోర⚛ߩቯ㊂߇น⢻ߢ޽ࠆ߇‫ޔ‬ᾖ኿႐․ᕈߥߤߩࡄ࡜ࡔ
࡯࠲ࠍ޽ࠄ߆ߓ߼ᱜ⏕ߦ᳞߼ࠆᔅⷐ߇޽ࠆ‫ޕ‬ߣߎࠈߢ‫ޔ‬ᣣᏱ⊛ߦࠃߊ૶↪ߐࠇࠆኅᐸ↪ࠕ࡞ࡒ▗ߪᐕ㑆ᢙජਁ࠻ࡦ಴⩄ߐࠇ‫ޔ‬ㄭᐕ቟ଔߥャ౉ຠ߽ᄙߊ⽼ᄁߐࠇߡ߅ࠅ‫ߩߘޔ‬ਇ⚐‛Ớᐲ߇໡ຠ㑆ߢߤߩ⒟ᐲᏅ߇޽ࠆ߆⥝๧߇ᜬߚࠇࠆ‫⎇ᧄߢߎߘޕ‬ⓥߢߪ‫ޔ‬12 ⒳㘃ߩኅᐸ↪ࠕ࡞ࡒ▗ਛߩਇ⚐‛ࠍ k0 ᴺߦࠃࠆਛᕈሶ᡼኿ൻಽᨆ
ᴺߢቯ㊂ࠍⴕߥ޿‫ޔ‬Ყセᴺߦࠃࠆቯ㊂୯ߣᲧセߒߚ‫ޕ‬䇼ታ㛎䇽 ⴫㕙ࠍࠕ࡞ࠦ࡯࡞ߢ᜞޿ߚኅᐸ↪ࠕ࡞ࡒ▗ߣ㜞⚐ᐲࠕ࡞ࡒ▗ 50-100mg‫ޔ‬k0 ᴺ↪ᮡḰ
‛⾰ SMELS 20-50mg‫ߦ߮ࠄߥޔ‬ᾖ኿႐․ᕈࠍ⍮ࠆߚ߼ߩ Au-Lu-Zr ࡕ࠾࠲ࠍ㜞⚐ᐲࡐ࡝ࠛ࠴
࡟ࡦⴼߦᾦኽߒ‫ޔ‬੩ㇺᄢቇේሶἹ KUR ߩ Pn-3 ߢ 10 ⑽‫ޔ‬Pn-2 ߢ 1-2 ᤨ㑆ᾖ኿ߒߚ‫ޕ‬ᾖ኿ᓟ‫ޔ‬ㆡᒰߥ಄ළᤨ㑆ࠍ߅޿ߡ Ge ඨዉ૕ᬌ಴ེߢ᷹ቯߒߚ‫ޕ‬Ყセᴺߪ JB-1a‫ޔ‬JA-2 ߹ߚߪ Ga ⹜⮎ࠍᲧセᮡḰ⹜ᢱߣߒߡ‫ޔ‬k0 ᴺߪ IAEA ߩផᅑߔࠆᚻ㗅ߦᓥ޿‫ޔ‬IAEA ⵾࠰ࡈ࠻࠙ࠚࠕ”k0-IAEA”
ࠍ೑↪ߒߡቯ㊂ߒߚ‫ࠍᦼᤨޕ‬ᄌ߃‫߷߶ޔ‬หߓ⹜ᢱࠍ↪޿ߚ৻ㅪߩታ㛎ࠍ 2 ᐲⴕߞߚ‫ޕ‬䇼⚿ᨐ䊶⠨ኤ䇽㩷 ⍴ᤨ㑆ᾖ኿ߩ⚿ᨐߩߺߎߎߢߪㅀߴࠆ‫ޕ‬k0 ᴺߢߩቯ㊂୯ߩ⏕߆ߐࠍጤ⍹ᮡḰ⹜ᢱ(JA-2‫ޔ‬JB-1a)ߣ SMELS-type1 ࠍ↪޿ߡ⏕⹺ߒߚ‫ޕ‬࿑ߦጤ⍹ᮡḰ⹜ᢱߣ SMELS-type1 ߩ k0
ᴺߢߩቯ㊂୯ߣᢥ₂୯ߩᲧࠍ␜ߒߚ‫ޕ‬ጤ⍹ᮡḰ⹜ᢱߢߪ Mn ߣ Ca ࠍ㒰ߊ 3 ర⚛ߢᢥ₂୯ߣ߶
߷ 10㧑એౝߢ৻⥌ߒ‫ޔ‬SMELS-type1 ߦߟ޿ߡ߽ V ࠍ㒰޿ߚ 6 ర⚛ߢෳᾖ୯ߣ߶߷ 10㧑એౝߢ৻⥌ߒߚ‫ޕ‬SMELS-type1 ߩ V ߩߺᄢ߈ߊ⇣ߥߞߚℂ↱ߪ੹ߩߣߎࠈਇ᣿ߢ޽ࠆ‫ޕ‬ࠕ࡞ࡒ▗⹜ᢱߢߪ‫ޔ‬⍴ᤨ㑆ᾖ኿ߢਇ⚐‛ߣߒߡ V ߣ Mn ߩቯ㊂ࠍⴕ߁ߎߣ߇ߢ߈ߚ‫ޕ‬k0 ᴺ
ߦࠃࠆቯ㊂୯ߪᲧセᴺߦࠃࠆቯ㊂୯ߣ♽⛔⊛ߦ V ߢ߅ࠃߘ 7%‫ޔ‬Mn ߢ߅ࠃߘ 14%ૐ߆ߞߚ‫ޕ‬ࠕ࡞ࡒ▗⹜ᢱߩ V ߣ Mn ߩỚᐲߪ‫ ߘࠃ߅ޔࠇߙࠇߘޔ‬25~300ppm ߣ߅ࠃߘ 14~220ppm ߢ޽ࠅ‫ޔ‬໡ຠߦࠃߞߡ 10 ୚એ਄Ꮕ߇޽ࠆߎߣ߇ಽ߆ߞߚ‫ޔߚ߹ޕ‬V ߣ Mn Ớᐲߦߪ᣿ࠄ߆ߥ⋧㑐㑐ଥߪ⷗ࠄࠇߥ߆ߞߚ߇‫ޔ‬V/Mn Ყߢࠕ࡞ࡒ▗ࠍ 3 ࠣ࡞࡯ࡊߦಽߌࠆߎߣ߇ߢ߈ߚ‫ޕ‬࿑ ጤ⍹ᮡḰ⹜ᢱߣ SMELS - type1 ߩ k0 ᴺߩቯ㊂୯ߣᢥ₂୯ߩᲧセ

Neutron activation analysis of household aluminum foils - Comparison between comparative method
and k0-IAEA method MIURA, Y., OURA, Y.

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3B07₎᪉⸆࠾ࡼࡧ⸆ⲡࡢᨺᑕ໬ศᯒ࠾Ⲕ኱ ࠊᮾ໭኱ ࠊி኱⅔  ‫⏣ྂۑ‬ᝋᏊ ࠊబ⸨ಟᙲ ࠊዟᮧⰋ ࠊ㣤἟ຬே 䛆䛿䛨䜑䛻䛇㻌 2013 ᖺ APSORC13㸦㔠ἑ㸧࡟࠾࠸࡚ࠊ119 ヨᩱࡢ₎᪉⸆࡜⸆ⲡࡢᨺᑕ໬ศᯒࡢ⤖ᯝࢆ
Ⓨ⾲ࡋࡓࠋࡇࡢ㝿࡟⏝࠸ࡓヨᩱ࡟㛵ࡋ࡚ࠊ௨ୗࡢෆᐜࢆ᫂ࡽ࠿࡟ࡋࡓࠋձ ₎᪉⸆ࡢࠕ∵㯤ゎẘ∦ࠖ࡜ࠕභ⚄୸ࠖࡢ 2 ✀㢮ࡣࠊAs ⃰ᗘࡀ㸣࣮࢜ࢲ࣮࡜㧗ࡃࠊࡉࡽ࡟ࠕභ⚄୸ࠖࡣ Hg ࡶྠ⃰ᗘྵࡲࢀ࡚࠸ࡓࠋղ ࣋ࢺࢼ࣒࡛㉎ධࡋࡓ⸆ⲡࡢከࡃ࡟ᴟప⃰ᗘ࡛ࡣ࠶ࡿࡀ Hg ࡀྵࡲࢀ࡚࠸ࡓࠋճ ᪥ᮏ〇ࡢ₎᪉⸆࡟ࡣ୰࣭㛗༙ῶᮇ࡜࡞ࡿ㔠ᒓඖ⣲ࡣࡩࡃࡲࢀ࡚࠸࡞࠿ࡗࡓࠋ2014 ᖺᗘࡣࠊձ ࡟㛵ࡋ࡚ࡣேయ࡬ࡢᙳ㡪࡜ࡋ࡚໬Ꮫᙧࡀ㔜せ࡛࠶ࡿࡓࡵࠊX ⥺ᅇᯒࢆ⾜ࡗࡓࠋࡉࡽ࡟ヨᩱᩘࢆቑࡸࡋࠊ
ձ࡟ᣲࡆࡓ 2 ₎᪉⸆ࡣᖖ࡟ As, Hg ࢆྠ⛬ᗘࢆྵࡴࡢ࠿ࠊ
ղࠊճࡣ୍⯡ㄽ࡜ゝ࠼ࡿࡢ࠿ࢆ᳨ウࡋࡓࠋ䛆ᐇ㦂䛇 ᪂ࡓ࡟ຍ࠼ࡓヨᩱࡣࠊ୰ᅜ〇ࠕ∵㯤ゎẘ∦ࠖ2 ✀㢮ࠊࠕභ⚄୸ࠖࡣࠊ୰ᅜ〇 1 ✀㢮ࠊ᪥ᮏ〇 2 ✀㢮࡛࠶ࡾࠊ₎᪉⸆ࡀ 18 ✀ࠊ⸆ⲡࡀ 9 ✀㢮࡛࠶ࡾࠊ࣋ࢺࢼ࣒ࡢ⸆ⲡࡣ෌ ᐃࡋࡓࠋᨺᑕ໬ศᯒ⏝ヨᩱࡣࠊ㏻ᖖࡢ⢊ᮎᆒ୍໬ࠊ⛗㔞ࠊ㧗⣧ᗘ࣏࢚ࣜࢳࣞࣥ࡬ࡢ 2 㔜ᑒධࢆ⾜ࡗࡓࠋ↷ᑕࡣ KUR ࡟࠾࠸࡚⾜࠸ࠊ1MWࠊ 0.5㹼2.5 ᫬㛫ࡢ↷ᑕ࡜ࡋࠊ1 㐌㛫ᚋ࡟㛤ᑒ ᐃࡋࠊ෌ᐃࢆ 1 ࠿᭶ᚋ࡟⾜ࡗࡓࠋࠕ∵㯤ゎẘ∦ࠖ࡜ࠕභ⚄୸ࠖྛ 3 ✀㢮ࡢヨᩱࡣࠊX ⥺ᅇᯒࢆ⾜ࡗࡓࠋX ⥺ᅇᯒࡣࠊࣜ࢞ࢡ〇 Ultima-ϫࢆ⏝࠸ࠊᚓࡽࢀࡓゎᯒࣃࢱ࣮ࣥࢆ JCDD ࡢࢹ࣮ࢱ࡜ẚ㍑ࡋ࡚ࠊ
໬ྜ≀┦ࢆỴᐃࡋࡓࠋ࠙⤖ᯝཬࡧ⪃ᐹࠚ ヨᩱࡢ⧞ࡾ㏉ࡋ ᐃ࡟ࡼࡾ 279 keV ࡢȚ⥺ࡣ 203Hg ࡟ࡼࡿࡶࡢ࡜☜ㄆࡋࡓࠋࠕ∵㯤ゎẘ∦ࠖ࡜ࠕභ⚄୸ࠖ࡟㛵ࡍࡿᨺᑕ໬ศᯒ⤖ᯝࡢ୍㒊ࢆ⾲ 1㸦SD ࡣ┬␎㸧࡟♧ࡍࠋྠ୍ྡ⛠ࡢ⸆࡛࠶ࡗ࡚ࡶࠊ୺ᡂศࡢῧຍ㔞ࡣ␗࡞ࡗ࡚࠸ࡓࠋCa, As, Hg ࡟㛵ࡋ࡚ࡣ㸣࣮࢜ࢲ࣮࡛
ῧຍࡉࢀ࡚࠾ࡾࠊX ⥺ᅇᯒࡀ༑ศྍ⬟࡛࠶ࡗࡓࠋX ⥺ᅇᯒࡢ⤖ᯝ࠿ࡽࠊࡇࢀࡽࡢヨᩱ୰ࡢ As
ࢆྵࡴ⤖ᬗ┦ࡣ Realgar㸦㭜ෙ▼ As4S4㸹༢ᩳᬗ)࡛࠶ࡾࠊHg ࡟ࡘ࠸࡚ࡣ Cinnabar㸦㎮◁ HgS㸹ṇ᪉ᬗ, As4S4㸹༢ᩳᬗ)ࠊCa ࡟ࡘ࠸࡚ࡣ Calcite㸦᪉ゎ▼ CaCO3㸹୕᪉ᬗ)࡛࠶ࡗࡓࠋ༶ࡕ As ࠾ࡼࡧ Hg ࡣ◲໬≀࡛࠶ࡾࠊேయ࡬ࡢ྾཰ࡣ࡞ࡃࢩࣙࢵࢡࢆ୚࠼ࡿ≀㉁࡛࠶ࡾࠊయෆࡣࢫࣝ̿ࡍ
ࡿ࡜⪃࠼ࡽࢀࡿᵓ㐀࡛࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋࡲࡓࠊSb ࡣ㭜ෙ▼ࡸ㎮◁࡜ඹᏑࡍࡿ㍤Ᏻ㖔࡟ከࡃྵࡲࢀ࡚࠾ࡾࠊAs, Hg ࡀࡇࢀࡽ㖔▼ࢆῧຍࡋ࡚࠸ࡿドᣐ࡟࡞ࡿ࡜⪃࠼ࡽࢀࡓࡀࠊ᪥ᮏࡢࠕභ
⚄୸ࠖ࡟ࡘ࠸࡚ࡣᙜ࡚ࡣࡲࡽ࡞࠿ࡗࡓࠋࡇࢀࡽࡢ㧗⃰ᗘࡢ㔜㔠ᒓࢆྵࡴ₎᪉⸆ࡣࠊ࢖ࣥࢱ࣮
ࢿࢵࢺࢆ㏻ࡋ࡚࡝ࡇ࠿ࡽ        ⾲ 1     2 ✀㢮ࡢ₎᪉⸆ࡢᨺᑕ໬ศᯒ⤖ᯝ࡛ࡶ㉎ධࡀྍ⬟࡛࠶ࡿࠋ₎᪉⸆ヨᩱ᰾✀⃰ᗘ (ppm)ࡉࡽ࡟ࠊ୰ᅜᅜෆ࡟㎰ሙࢆᣢࡘ᪥ᮏ࣓࣮࣮࢝ࡢ₎᪉
No
Ca-47
As-76
Sb-124Hg-203ྡ⛠⏕⏘ᅜ⸆࡟ࡣ㸦୰࣭㛗༙ῶᮇࡢ㸧 1
34,40083,000
250
16.0
୰ᅜ
∵㯤
㔜㔠ᒓඖ⣲ࡣ᳨ฟࡉࢀ࡞
2
10,800220,000
21.1
1.19
୰ᅜ
ゎẘ∦
࠿ࡗࡓࡀࠊ᪥ᮏᅜෆ࡛᱂ᇵ
3
18,00085,800204
7.36
୰ᅜࡉࢀࡓ࡜⪃࠼ࡽࢀࡿཎᮦ
4
199,000
74,000330
74,000୰ᅜᩱࢆ౑⏝ࡋࡓ᪥ᮏࡢ₎᪉
71,00064,600305
79,300୰ᅜ⸆ࠊ⸆ⲡ㢮࡟ࡣ✀ࠎࡢඖ⣲ 5භ⚄୸ࡀྵࡲࢀ࡚࠸ࡓࠋヨᩱูࡢ 6
23,400
553
0.419
1.25
᪥ᮏ
⤖ᯝࢆሗ࿌ࡍࡿࠋ
7
149,000
12,4006.01
30.8
᪥ᮏ
INAA of Chinese medicine and herbs
FURUTA, E., SATO, N., OKUMURA, R., IINUMA, Y..

- 106 -

3B08

ຍ㏿ჾ᪋タ࡛⏕ᡂࡉࢀࡿ࢚࢔ࣟࢰࣝ⢏ᚄศᕸ ᐃ࡟ᙳ㡪ࡍࡿせᅉ࡟ࡘ࠸࡚
⸨⏣ಖ⾨኱ ࠊி኱⅔  ‫ۑ‬ᶓᒣ㡲⨾ ࠊἈ 㞝୍ ࠊ㛵ᮏ ಇ ಶᩘ⃰ᗘ䠄dN/dlogDp㻕䛆⥴ゝ䛇㻌 ኱ᆺຍ㏿ჾ᪋タ࡛ࡢసᴗ⪅ࡢෆ㒊⿕ࡤࡃ⥺㔞ホ౯ࢆ⾜࠺ୖ࡛ࠊຍ㏿ჾᐊෆ✵Ẽ୰࡟⏕ᡂࡋࡓ⢏Ꮚ≧ᨺᑕᛶ᰾✀ࡢ⢏ᚄศᕸࡣ㔜せ࡞ᅉᏊࡢ୍ࡘ࡛࠶ࡿࠋࡇࡢࡓࡵࠊ㟁Ꮚ⥺ᆺຍ㏿ჾࢱ࣮ࢤࢵࢺᐊෆ࡛ࣅ࣮࣒↷ᑕ୰࡟⏕ᡂࡉࢀࡿᨺᑕᛶ⢏Ꮚࡢಶᩘ⃰ᗘศᕸཬࡧᨺᑕ⬟⃰ᗘศᕸࢆ ᐃࡋࠊ↷ᑕ᫬㛫ࡸࣅ࣮࣒㟁ὶ್ࡢ㐪࠸ࡀࠊࢱ࣮ࢤࢵࢺᐊෆ⢏Ꮚࡢ⢏ᚄศᕸ࡟࡝ࡢࡼ࠺࡞
ᙳ㡪ࢆ୚࠼ࡿࡢ࠿ࠊࡲࡓࠊಶᩘ⃰ᗘศᕸ࠿ࡽᨺᑕ⬟ศᕸࢆ⟬ฟࡍࡿሙྜࠊᙳ㡪ࢆ୚࠼ࡿせᅉࢆ᫂ࡽ࠿࡟ࡋࡓࠋ
䛆ᐇ㦂䛇㻌 ᐇ㦂ࡣி㒔኱ᏛཎᏊ⅔ᐇ㦂ᡤ㟁Ꮚ⥺ᆺຍ㏿ჾ㸦LINAC㸪୰ᛶᏊ᮰㸸31011 n/cm2/s㸦ࣅ࣮࣒ฟຊ 6kW ᫬㸧㸧࡟࡚ᐇ᪋ࡋࡓࠋࣅ࣮࣒࢚ࢿࣝࢠ࣮ࡣ 30MeV ࡜ࡋࠊࣅ࣮࣒㟁ὶࢆ 20µA㹼
100μA ࡜ࡋࡓࠋLINAC ࢱ࣮ࢤࢵࢺᐊෆ㸦⣙ 150 m3㸧ࡢࣅ࣮࣒ࣛ࢖ࣥୖ࡟ࡣ Ta ࢱ࣮ࢤࢵࢺࢆタ⨨ࡋ࡚୰ᛶᏊࢆⓎ⏕ࡉࡏࡓࠋࢱ࣮ࢤࢵࢺᚋ᪉࡟ࢫࢸࣥࣞࢫ〇ࡢࣇࣞ࢟ࢩࣈࣝࢳ࣮ࣗࣈ㸦㛗ࡉ 6 mmࠊ┤ᚄ 25 mm㸧ࡢ∦➃ࢆタ⨨ࡋࡓࠋࡇࡢࢳ࣮ࣗࣈࡢࡶ࠺୍᪉࡟ࡣࠊ㞄᥋ࡍࡿ ᐃᐊ࡟タ⨨ࡋࡓ㉮ᰝᆺࣔࣅࣜࢸ࢕⢏ᚄ ᐃჾ㸦SMPS㸹Scanning Mobility Particle Sizer, TSI ♫〇 Model
3936㸧ࢆ᥋⥆ࡋࠊࢱ࣮ࢤࢵࢺᐊෆ࡛⏕ᡂࡉࢀࡓ⢏Ꮚࡢಶᩘ⃰ᗘࢆ ᐃࡋࡓࠋࡲࡓࠊ࣮ࣟࣉࣞࢵࢩ
࣮ࣕ࢝ࢫࢣ࣮ࢻ࢖ࣥࣃࢡࢱ㸦ᮾிࢲ࢖ࣞࢵࢡ♫〇ࠊLP-20RS㸪13 ẁ㸧ࡶྜࢃࡏ࡚᥋⥆ࡋࠊࣅ࣮࣒Ⓨ⏕㛤ጞ࠿ࡽ 1 ᫬㛫ᚋ࡟࣏ࣥࣉ࡟ࡼࡾ 20L/min ࡛྾ᘬࡋࠊ⏕ᡂ⢏Ꮚࢆศ⣭ᤕ㞟ࡋࡓࠋ࡞࠾ࠊ
࢝ࢫࢣ࣮ࢻ࢖ࣥࣃࢡࢱࡢྛẁ࡟ࡣࢫࢸࣥࣞࢫᤕ㞟ᯈࢆ⿦╔ࡋࠊᤕ㞟ᯈ࡟ࡣࢢࣜࢫࢆሬᕸࡋࠊ
⢏Ꮚࡢ㊴ࡡ㏉ࡾࢆ㜵Ṇࡋࡓࠋࡉࡽ࡟ࠊࣇࣞ࢟ࢩࣈࣝࢳ࣮ࣗࣈࡢ ᐃᐊഃ࡟ࢸࣇࣟࣥࣇ࢕ࣝࢱ
㸦࢔ࢻࣂࣥࢸࢵࢡ♫〇 47mmȭࠊ࣏࢔ࢧ࢖ࢬ 0.8 μm㸧ࢆ⿦╔ࡋࠊὶ㔞⋡ 36 l/min ࡛ 15 ศ㛫྾ᘬࡋࠊ⢏Ꮚࢆᤕ㞟ࡋࡓࠋ࢝ࢫࢣ࣮ࢻ࢖ࣥࣃࢡࢱ࡛ᤕ㞟ࡋࡓ⢏Ꮚࡢᨺᑕ⬟ࢆ GM ィᩘ⟶࡛ࠊࣇ࢕ࣝࢱ࡟ᤕ㞟ࡋࡓ⢏Ꮚࡢᨺᑕ⬟ࢆ BGO ᳨ฟჾ࡟ࡼࡾ ᐃࡋࠊῶ⾶⿵ṇࢆ⾜࠸ᨺᑕᛶ⢏Ꮚࡢᨺᑕ⬟ศᕸࢆ⟬ᐃࡋࡓࠋ䛆⤖ᯝ䛇 ࣇ࢕ࣝࢱ࡟ᤕ㞟ࡋࡓ⢏Ꮚࡢᨺᑕ⬟ࢆ ᐃࡋࡓ⤖ᯝࠊ⏕ᡂᨺᑕᛶ⢏Ꮚࡢᐇຠ༙ῶᮇࡣࠊ
10.5s0.2 ศ࡜࡞ࡗࡓࠋࡇࡢࡇ࡜࠿ࡽࠊᨺᑕᛶ⢏Ꮚࡢ୺࡞ᨺᑕᛶ᰾✀ࡣ✵Ẽ୰ࡢ❅⣲㸦14N㸧ࡢᨺᑕ໬≀࡛࠶ࡿ 13N㸦T1/2㸻9.97 ศ㸧࡛࠶ࡗࡓ࡜࠸࠼ࡿࠋ ࣅ࣮࣒Ⓨ⏕㛤ጞ 60㹼90 ศ࡟ SMPS ࡛ ᐃࡋࡓ⏕ᡂ⢏Ꮚࡢಶᩘ⃰ᗘศᕸࢆ Fig. 1 ࡟♧ࡍࠋಶᩘ⃰ᗘࡣࠊࣅ࣮࣒㟁ὶ㸦ࣅ࣮࣒ࣇࣛࢵࢡࢫ㸧ࡀ㧗ࡃ࡞ࡿ࡟ࡘࢀ㧗ࡃ࡞ࡿഴྥࢆ♧ࡋࡓࡀࠊศ㻡㻢 䡔㻝㻜ᕸࡣྠᵝ࡛࠶ࡗࡓ㸦80μA ࡢሙྜࠊ155 nm㸧ࠋ࢝ࢫࢣ࣮ࢻ࢖ࣥࣃࢡࢱ࡟ࡼࡾᤕ㞟ࡋࡓ⢏Ꮚ
㻌㻞㻜!"
㻡
㻌㻡㻜!"
ࡢᨺᑕ⬟ศᕸ࡟ࡘ࠸࡚ࡶྠᵝ࡞ഴྥࢆ♧ࡋ㻌㻤㻜!"㻠㻌㻝㻜㻜!"
ࡓࠋ୍᪉ࠊࣅ࣮࣒㟁ὶ 80μA ࡟࠾࠸࡚ࠊSMPS
ࡢಶᩘ⃰ᗘศᕸ࠿ࡽ⟬ฟࡋࡓᨺᑕ⬟ศᕸ࡜㻟࢝ࢫࢣ࣮ࢻ࢖ࣥࣃࢡࢱࡢ⤖ᯝࢆẚ㍑ࡋࡓ࡜
㻞ࡇࢁࠊ࢝ࢫࢣ࣮ࢻ࢖ࣥࣃࢡࢱ࡟ࡼࡿ୰ኸᚄࡣࠊ
㻝
SMPS ࡼࡾ᥎ᐃࡋࡓ್ࡢ⣙ 1.3 ಸ࡜࡞ࡗࡓࠋ
ࡇࢀࡣࠊ࢖ࣥࣃࢡࢱୖẁ㸦኱⢏ᚄഃ㸧࡬ᚤᑠ㻜
10100⢏Ꮚࡲࡓࡣ࢞ࢫࡀ௜╔ࡋࡓࡇ࡜࡟ࡼࡿ࡜⪃⢏ᚄ䠄nm䠅
࠼ࡽࢀࡿࠋ
Fig. 1 ⏕ᡂ⢏Ꮚࡢಶᩘ⃰ᗘศᕸ
A Factor Affecting Activity Distribution of Radioactive Aerosols Formed in Accelerator Target RoomYOKOYAMA, S., OKI, Y., SEKIMOTO,
SEKI, S..
S.

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3B09

஭ ᡞ Ỉ ୰ 9 0 Sr ⃰ ᗘ 䛻ᙳ 㡪 䜢ཬ 䜌䛩⎔ ቃ ᅉ Ꮚ 䛻䛴䛔䛶䠄᪥ ᮏ ཎ ⇞ 䞞 1 䚸䠰䠬䠰 2 䠅䕿ᖾ 㐍 1 䚸ᒸ ග ᫛ 1 䚸బ 䚻ᮌ ⪔ ୍ 1 䚸ᒸ ᮧ Ὀ ἞ 1 䚸
῝ ㈅ ῟ 2䛆⥴ゝ䛇㻌 1989 ᖺ 䛛䜙ᐇ ᪋ 䛧䛶䛔 䜛䚸භ 䞄ᡤ ཎ Ꮚ ⇞ ᩱ 䝃䜲䜽 䝹᪋ タ ࿘ ㎶ 䛾⎔ ቃ 䝰䝙 䝍䝸䞁䜾㡯 ┠ 䛾䛖䛱䚸஭ ᡞ Ỉ 䠄ᆅ Ⅼ ᩘ 䠖䠎ᆅ Ⅼ 䚸㢖 ᗘ 䠖䠐ᅇ 䠋ᖺ 䚸 ᐃ 㡯 ┠ 䠖! ᰾ ✀ , 3 H, 9 0 Sr 䠅
୰ 9 0 Sr 䛾ᣲ ື 䛻䛴䛔 䛶ㄪ ᰝ 䛧䛯⤖ ᯝ 䜢 ሗ ࿌ 䛩䜛䚹䠍ᆅ Ⅼ 䠄ᑿ 㥨 䠎䠖ὸ ஭ ᡞ 䠅䛻䛚䛔䛶䚸2003 ᖺ 㡭 䛻⣙ 3mBq/L 䛷䛒䛳䛯஭ ᡞ Ỉ ୰ 9 0 Sr ⃰ ᗘ䛜ᚎ 䚻䛻ୖ ᪼ 䛧䚸
2011 ᖺ 䛻 28mBq/L䛻㐩 䛧䛯䚹ẚ ᨺ ᑕ ⬟䠄 9 0 Sr/ Ᏻ ᐃ Sr䠅䛚䜘䜃᪋ タ 䛾㐠 ㌿ ᒚ Ṕ ➼䜢⪃ ៖ 䛧䛶䚸䛣䛾⃰ ᗘୖ ᪼ 䛿᪋ タ ᙳ 㡪 䛻䜘䜛䜒䛾䛷䛿䛺䛔䛣䛸䛜☜ ㄆ 䛥䜜䛯䛜䚸⃰ ᗘኚ ື 䛾ཎ ᅉ 䛻䛴䛔䛶ᅗ 1㻌 ஭ᡞỈ䠄ᑿ㥨䠎䠅䛾 90Sr ⃰ᗘ䛸 90Sr ẚᨺᑕ⬟䛾᥎⛣᭦ 䛻ㄪ ᰝ 䜢㐍 䜑 䛯䚹䛆ㄪ ᰝ ෆ ᐜ 䛇⎔ ቃ 䝰䝙䝍䝸䞁䜾䛷䛿䚸ሗ ࿌ 㡯 ┠ 䛾䜋䛛䛻ヨ ᩱ ᥇ ྲྀ ᫬ 䛾஭ ᡞ 䛾Ỉ ఩ 䚸ᑟ㟁 ⋡ (EC)䚸pH䚸Ᏻ ᐃ Sr ⃰ ᗘ 䛻䛴䛔䛶䛾䝕䞊䝍䜢90

ᐃ 䛧䛶䛚䜚䚸䛣䜜 䜎䛷䛾ᐃ ⤖ ᯝ 䛛䜙䚸Sr ⃰ ᗘ 䛸 EC 䛚䜘䜃Ᏻ ᐃ Sr ⃰ ᗘ 䛜䜘䛟┦ 㛵 䛩䜛䛣䛸䜢☜ ㄆ 䛧䛯䛾䛷䚸᭦ 䛻⪃ ᐹ 䜢㐍 䜑䜛䛯䜑䛻 1) 䜲䜸 䞁䜽 䝻䝬 䝖䜾䝷䝣 䜱䞊䛻䜘䜛୺ せ 䜲 䜸 䞁⤌ ᡂ 䛾䜃㐣 ཤ 䛾ᕤ ஦ ≧ ἣ 䛾ㄪ ᰝ 䚸3)ᐃ 䚸2) ࿘ ㎶ 䛾ᵓ 㐀 ≀ 䛚䜘ᐃ ჾ 䛾ᖖ タ 䛻䜘䜛 EC 䛾ᖖ ᫬䛆⤖ ᯝ 䛸⪃ ᐹ 䛇1) ୺ せ 䜲 䜸䞁⤌ ᡂ 䛾䠇ᐃ 䜢ᐇ ᪋ 䛧䛯䚹䠉ᐃ 䛷 䚸Na 䚸Cl ⃰ ᗘ 䛜௚ 䛾䜲䜸 䞁✀ 䜘䜚䜒኱ 䛝䛟ኚື 䛩䜛䛣䛸䛜᫂ 䜙䛛䛻䛺䛳䛯䚹䛣䛾䛣䛸䛛䜙䚸䛣䛾஭ ᡞ Ỉ 䛾Ỉ ㉁ 䛿㉳ ※ 䛾␗ 䛺䜛䛔䛟䛴䛛䛾ᡂ ศ 䛜 ྜ ᡂ 䛥䜜 䛶䛔 䜛 䛣䛸 䛜♧ ၀ 䛥䜜 䛯 䚹2) ᆅ ୗ Ỉ 䛾 ὶ 䜜 ㎸ 䜣䛷 䛟 䜛 ୖ ὶ 䛻 䛒䛯 䜛ሙ ᡤ䛻䚸෤ Ꮨ 䛻᤼ 㞷 ሙ ᡤ 䛸 䛧 䛶౑ 䜟 䜜 䜛㇂ 䚸ỿ ◁ ụ 䚸ᆅ ୗ 㓄 ⟶ ➼ 䛜䛒䜛䛣䛸䜢☜ ㄆ䛧 䛯䚹᤼ 㞷 స ᴗ 䜔㝆 㞵 ➼ 䛾ᙳ 㡪 䛷 ஭ ᡞỈ 䛾Ỉ ㉁ 䛜Ꮨ ⠇ ኚ ື 䛩䜛ྍ ⬟ ᛶ 䛜♧၀ 䛥 䜜 䛯 䚹 3)EC 䛿 䠍 ᖺ ࿘ ᮇ 䛷 ⦆ 䜔 䛛 䛻ኚ ື 䛧䛺䛜䜙䚸▷ ᮇ 㛫 䛷኱ 䛝䛟ኚ ື 䛩䜛ሙ ྜ 䛜䛒䛳䛯䚹EC 䛾▷ ᮇ ኚ ື 䛸㝆 Ỉ 㔞䛾㛵 ಀ 䛿᫂ ☜ 䛷䛿䛺䛛䛳䛯䛜䚸ὸ ஭ ᡞ䛾Ỉ ㉁ 䛿䚸 ኱ 㞵 䜔 ⼥ 㞷 ➼ 䛾 ୍ ᫬ ⓗ 䛺䜲ᅗ 2㻌 ஭ᡞỈ EC 㐃⥆ ᐃ䛾⤖ᯝ䝧䞁䝖䛾ᙳ 㡪 䜢ཷ 䛡䜛䛸 ⪃ 䛘䜙䜜䜛䚹䛆䜎䛸䜑䛇⎔ ቃ 䝰䝙䝍䝸䞁䜾䛸䛧䛶⎔ ቃ ヨ ᩱ 䜢ᐃ 䛩䜛ሙ ྜ 䚸ே Ⅽ ά ື 䜔Ẽ ㇟ 䛺䛹䛾⎔ ቃᅉ Ꮚ 䛾ᙳ 㡪 䜢⪃ ៖ 䛻ධ 䜜䛶䚸⤖ ᯝ 䜢ホ ౯ 䛩䜛ᚲ せ 䛜䛒䜛䚹
Environmental factors on 90Sr concentration in shallow well water
KOU, S., OKA, M., SASAKI, K., OKAMURA, Y., FUKAGAI, J.

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3B10ᮾᾏ෌ฎ⌮᪋タ࿘㎶ࡢ⏿ᅵ୰ , ⃰ᗘᐃ࡬ࡢ ,&306 ἲࡢ㐺⏝ཎᏊຊᶵᵓ ‫ۑ‬Ọᒸ⨾ెࠊᶓᒣ⿱ஓࠊ⸨⏣༤႐䛆䛿䛨䜑䛻䛇 ࣚ࢘⣲-129㸦129Iࠊ༙ῶᮇ 1570 ୓ᖺ㸧ࡣࠊ⮬↛⏺࡛ࡣ኱Ẽ୰ࡢ࢟ࢭࣀࣥ㸦Xe㸧࡜Ᏹᐂ⥺࡜ࡢ཯ᛂࡸ࢘ࣛࣥ-238 ࡢ⮬Ⓨ᰾ศ⿣࡟ࡼࡾ⏕ᡂࡉࢀࡿࠋࡑࡢ୍᪉࡛ࠊ኱Ẽᅪෆ᰾ᐇ㦂
ࡸཎᏊຊⓎ㟁ᡤࡢ஦ᨾࠊ᰾⇞ᩱ෌ฎ⌮᪋タࡢ✌ാ࡟క࠸ࠊ129I ࡣ⎔ቃ୰࡬ᨺฟࡉࢀࡿࠋཎᏊຊ
ᶵᵓ࡛ࡣࠊᮾᾏ෌ฎ⌮᪋タ࿘㎶࡟࠾ࡅࡿ 129I ࡢ⵳✚≧ἣࢆᢕᥱࡍࡿࡓࡵ࡟ࠊ⏿ᅵ୰ࡢ 129I ⃰ᗘᐃࢆ 1982 ᖺࡼࡾᐃᮇⓗ࡟ᐇ᪋ࡋ࡚࠸ࡿࠋᚑ᮶ࠊࡇࡢ 129I ⃰ᗘࡢ ᐃ࡟ࡣࠊ୰ᛶᏊᨺᑕ໬ศ
ᯒἲ࡜ຍ㏿ჾ㉁㔞ศᯒἲ㸦AMS㸧ࢆ㐺⏝ࡋ࡚ࡁࡓࠋࡋ࠿ࡋࠊࡇࢀࡽࡢ ᐃ᪉ἲࡣࠊ129I ࡢ᳨ฟឤᗘ࡟ඃࢀ࡚࠸ࡿࡀࠊࡑࡢ ᐃࡣ᫬㛫ⓗ࡞ไ⣙ࡸ᪋タࡢ㐠㌿≧ἣ➼࡟౫Ꮡࡋࠊ ᐃ⤖ᯝࢆࡍࡄ࡟ᚓࡿࡇ࡜ࡀ࡛ࡁ࡞࠸ࠋࡇࡢࡓࡵࠊࢺࣜࣉࣝᅄ㔜ᴟㄏᑟ⤖ྜࣉࣛࢬ࣐㉁㔞ศᯒ⿦⨨㸦ICP-QQQ㸧ࢆ⏝࠸ࡓ⏿ᅵ୰ 129I ᐃἲࡢ᳨ウࢆ⾜ࡗࡓࠋᮏ◊✲࡛ࡣࠊࡲࡎࠊICP-QQQ ࡢ᭱㐺࡞ ᐃ᮲௳ࡢ᳨ウࢆ⾜࠸ࠊࡑࡢ᮲௳ୗ࡛ᮾᾏ෌ฎ⌮᪋タ࿘㎶ᅵተ୰ 129I ࢆ ᐃࡋࡓࠋࡑࡢ
⤖ᯝࢆ AMS ࡟ࡼࡿ⤖ᯝ࡜ẚ㍑ࡋࠊᅵተ୰ 129I ᐃ࡬ࡢ ICP-QQQ ࡢ㐺⏝ྍ⬟ᛶ࡟ࡘ࠸᳨࡚ウࡋࡓࠋ䛆ᐇ㦂䛇ᮾᾏ෌ฎ⌮᪋タ࠿ࡽ༡す⣙ 1 kmࠊ2 km ཬࡧ 3 km ࡢ㊥㞳࡟఩⨨ࡍࡿ⏿ᅵヨᩱࢆ⏝࠸࡚ 129I ⃰ᗘࡢᐃ㔞ࢆ⾜ࡗࡓࠋヨᩱࡣࠊ᪤࡟ AMS[1]࡛ ᐃ⤖ᯝࡀᚓࡽࢀ࡚࠸ࡿ 2011 ᖺཬ
ࡧ 2012 ᖺ࡟᥇ྲྀࡋࡓ⏿ᅵࢆ⏝࠸ࡓࠋヨᩱࡣࡲࡎࠊ⣙ 60Υ
࡛ 5 ᪥㛫⛬஝⇱ࡋࠊ2 ੈ௨ୗ࡟⠠࠸ศࡅࡋࡓࠋࡑࡢヨᩱ 100g ࢆ▼ⱥ⇞↝⟶࡟ワࡵࠊ200Υ㹼1000Υࡲ࡛⇞↝ ᗘࢆ࠶ࡆࠊ
᥹Ⓨࡋࡓࣚ࢘⣲ࢆ 0.5 g ࡢάᛶⅣ࡟ᤕ㞟ࡋࡓࠋࡑࡢᚋࠊỈ㓟໬ࢼࢺ࣒࡛ࣜ࢘ᾐฟᚋࠊ⁐፹ᢳฟ࡛⢭〇ࡋࡓࡢࡕࠊPdI2
ỿ⃦ࢆసᡂࡋࡓࠋࡑࡢỿ⃦ࢆ 600Υࡲ࡛ຍ⇕ࡋࠊ᥹Ⓨࡉࡏࡓࣚ࢘⣲ࢆ 0.5%TMAH ࡟⁐ゎࡉࡏࡓࡶࡢࢆ ᐃヨᩱ࡜ࡋࡓ 㸦 Fig.1 㸧ࠋ ᐃ ヨ ᩱ ࡣ ࠊ Agilent Technologies ♫ 〇 ࡢ
ICP-QQQ ࡛ ᐃࡋࡓࠋ࡞࠾ࠊICP-QQQ ࡟࠾࠸࡚ࡣࠊࣉࣛ
ࢬ࣐࢞ࢫ୰࡟ྵࡲࢀࡿ 129Xe ࡢᙳ㡪ࢆ᭱ᑠ㝈໬ࡍࡿࡓࡵࡢ
Measurement by ICP-QQQ㻌
ࣜ࢔ࢡࢩࣙࣥ࢞ࢫ࡜ࡋ࡚ࡢ㓟⣲࢞ࢫὶ㔞ࢆ᳨ウࡋࠊ ᐃ᮲௳ࡢ᭱㐺໬ࢆ⾜ࡗࡓࠋAMSᐃࡣࠊཎᏊຊᶵᵓ㟷᳃◊✲
Fig.1 Procedure for the determination of㛤Ⓨࢭࣥࢱ࣮࡟タ⨨ࡉࢀ࡚࠸ࡿ High Voltage Engineering
Iodine-129 by ICP-QQQ.㻌
Europa 〇ࡢࢱࣥࢹ࣒ᆺຍ㏿ჾࢆ⏝࠸ࡓࠋᏳᐃࣚ࢘⣲ࡣࠊⅣ㓟ሷ↎↝ἲ࡛⢭〇ᚋࠊICP-QQQ ࡛ ᐃࢆ⾜ࡗࡓࠋ䛆⤖ᯝ䛸⪃ᐹ䛇ICP-QQQ ࡢ㓟⣲࢞ࢫὶ㔞ࢆ᳨ウࡋࡓ⤖ᯝࠊ0.7 mL/min ࡀ 129Xe ࡸ 127IH2+➼ࡢศᏊ࢖࢜ࣥ࡟ࡼࡿᙳ㡪ࢆ᭱ᑠ㝈࡟ᢚ࠼ࡿୖ࡛ࠊ᭱㐺࡞ࡇ࡜ࡀศ࠿ࡗࡓࠋࡇࡢ ᐃ᮲௳࡛ࠊ129I
ࡢ᳨ฟ㝈⏺್ࡣࠊ0.1 mBq/kg ࡛࠶ࡗࡓࠋḟ࡟ࠊヨᩱࡢ ᐃࢆ⾜ࡗࡓ⤖ᯝࠊICP-QQQ ࡟ࡼࡾᚓࡽࢀࡓ 129I ⃰ᗘࡣࠊAMS ࡛ᚓࡽࢀࡓ⤖ᯝ࡜୍⮴ࡋࡓࠋ࡞࠾ࠊᮏศᯒᕤ⛬࡟࠾ࡅࡿᅇ཰⋡ࡣࠊ⣙ 80㸣࡛࠶ࡗࡓࠋᮏ◊✲࡟ࡼࡾࠊICP-QQQ ࢆ⏝࠸࡚ࠊᮾᾏ෌ฎ⌮᪋タ࿘㎶ࡢ⏿ᅵ୰ 129I ⃰ᗘࢆᐃ㔞࡛ࡁࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ
[1] Y. Kokubun et al., RADIOISOTOPES, 60, 109-116 (2011)
Application of ICP-MS to determination of 129I in field soil around Tokai Reprocessing Plant
NAGAOKA, M., YOKOYAMA, H., FUJITA, H..

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3B11

Pu ࢆྵࡴᴟᚤ㔞ከඖ⣲㏲ḟศ㞳ἲཎᏊຊᶵᵓ࣭ศᯒ໬Ꮫ◊✲ࢢ࣮ࣝࣉ ‫ۑ‬ᐑᮏࣘࢱ࢝ࠊᏳ⏣೺୍㑻ࠊ㛫᯶ṇ᫂䛆⥴ゝ䛇㻌 ཎᏊຊ᪋タࡢ஦ᨾࡸ᰾⇿ᙎ࡞࡝࡟ࡼࡗ࡚⎔ቃ୰࡟ᨺฟࡉࢀࡓᨺᑕᛶ᰾✀ࢆྵࡴ⎔ቃ≀㉁ࡀ㛗ᮇⓗ࡟࡝ࡢࡼ࠺࡟ኚືࡋ࡚࠸ࡃࡢ࠿ࢆண ࡍࡿୖ࡛ࠊࡇࢀࡲ࡛ࡢኚືᒚṔࡢ ᐃ⤖ᯝࡀ㠀ᖖ࡟ᙺ❧ࡘࠋ᳜≀࡟ࡶࣉࣝࢺࢽ࣒࢘ࡸ࢘ࣛࣥ࡞࡝ࡣᴟᚤ㔞࡛࠶ࡿࡀྲྀࡾ㎸ࡲࢀࡿࠋࣉ
ࣝࢺࢽ࣒࢘ࡢྠ఩యẚ(240Pu/239Pu ࡞࡝)ࢆ ᐃࡍࡿࡇ࡜࡛ཎ⇿ࡸ᰾ᐇ㦂࡞࡝ᨺฟ㉳※ࡢ᥎ᐃࡀྍ⬟࡜࡞ࡿࠋࡋ࠿ࡋࠊ᳜≀࡟ྵࡲࢀࡿ Pu ⃰ᗘࡣ᭱኱࡛ᩘ 10 ࣆࢥࢢ࣒ࣛ(10-11 g) / kg ⛬ᗘ࡜ᴟᚤ㔞࡛࠶ࡿࡇ࡜ࠊศᯒ࡟౪ࡍࡿࡇ࡜ࡀ࡛ࡁࡿヨᩱ㔞࡟ไ㝈ࡀ࠶ࡿࡇ࡜࠿ࡽࠊࣆࢥࢢ࣒ࣛ௨ୗ
ࡢᴟᚤ㔞ඖ⣲ࢆศᯒࡍࡿࡓࡵࡢ໬Ꮫศ㞳ᢏ⾡ࡀᚲせ࡛࠶ࡿࠋⓎ⾲⪅ࡽࡣࠊࡇࢀࡲ࡛࡟୍ᮏࡢ
㝜࢖࢜ࣥ஺᥮࣒࡛࢝ࣛࢼࣀࢢ࣒ࣛ(10-9 g)௨ୗࡢ࢘ࣛࣥࠊࢺ࣒ࣜ࢘ࠊ㖄ࠊᕼᅵ㢮ඖ⣲ࢆ㏲ḟⓗ࡟⮬ື࡛ศ㞳ࡍࡿᢏ⾡ࢆ㛤Ⓨࡋ࡚ࡁࡓ(1)ࠋࡇࡢ㏲ḟศ㞳ἲࢆⓎᒎࡉࡏ࡚ࣉࣝࢺࢽ࣒࢘ࡢ㏲ḟศ㞳ࡶྍ⬟࡟࡞ࢀࡤ᳜≀ヨᩱࡢᴟᚤ㔞ศᯒࡀྍ⬟࡛࠶ࡿ࡜⪃࠼ࠊࣉࣝࢺࢽ࣒࢘ࢆྵࡴᴟᚤ㔞ከඖ⣲㏲ḟศ㞳ἲࢆ㛤ⓎࡍࡿࡓࡵࠊPu ࢫࣃ࢖ࢡࢆ⏝࠸ࡓศ㞳ᐇ㦂ࢆ⾜ࡗࡓࠋ䛆ᐇ㦂䛇㻌 242Pu ࢫࣃ࢖ࢡ 11 pg ࡜ ICP-MS ᰯṇ⁐ᾮࡢ Th 200 pg ࢆศ㞳ヨᩱ࡜ࡋࠊ㓑㓟(AcOH)ࢆ
୺ᡂศ࡜ࡍࡿΰ㓟࠿ࡽ࡞ࡿヨᩱ⁐ᾮ 1 mL ࡟ㄪ〇ࡋࡓࠋࡇࡢ⁐ᾮࢆ㝜࢖࢜ࣥ஺᥮ᶞ⬡(MCI-GEL CA08P, ⢏ᚄ 75㹼150 !m, Cl㸫ᙧ)ࢆワࡵࡓ࣒࢝ࣛ(ෆᚄ 4 mm, 㛗ࡉ 70 mm, ࣒࢝ࣛᐜ㔞 0.84 mL)࡟ὶࡋ࡚ࠊ
࣒࢝ࣛୖ࡟྾╔ࡉࡏࡓᚋࠊ
AcOHࠊHCl ࠾ࡼࡧ HF ࡢΰ㓟ࢆὶࡋ࡚ Th ࡜ Puࡢ⁐ฟᣲືࡀ AcOH ࡜ HCl ࡢ⃰ᗘ࡟ࡼࡗ࡚࡝ࡢ
ࡼ࠺࡟ኚ໬ࡍࡿ࠿ࢆㄪ࡭ࡓࠋ4 mL ẖ࡟㞟ࡵࡓ⁐
ฟᾮࢆ⵨Ⓨ஝ᅛࡉࡏࡓᚋࠊ2% HNO3 ᐃ⁐ᾮ࡟ㄪ〇ࡋࡓࠋ㧗ศゎ⬟ ICP-MS (ELEMENT-1)ࢆ⏝࠸࡚࢖࢜ࣥᙉᗘ(cps)ࢆ ᐃࡋࠊPu ࡜ Th ࡢ⁐ฟ⋡(%)ࢆẚ㍑ᶆ‽⁐ᾮ࡜ヨᩱࡢᙉᗘࡢẚ㍑࠿ࡽồࡵࡓࠋ䛆⤖ᯝ䛇㻌 Fig.1 ࡟ΰྜ⁐፹⤌ᡂ࡟ࡼࡿ Th ࡜ Pu ࡢ⁐㞳ᣲືࡢ㐪࠸ࢆ♧ࡍࠋࡇࢀࡲ࡛࡟㛤Ⓨࡋࡓ㏲ḟศ㞳ἲ࡛ࡣࠊTh ࢆ 70㸣 AcOH + 1M HCl +0.1M HF ࡢΰྜ⁐፹࡛⁐㞳ࡋ࡚࠸ࡓࡀࠊPu ࡶ Th࡜ྠ᫬࡟⁐ฟࡍࡿࡇ࡜ࡀศ࠿ࡗࡓࠋࡉࡽ࡟ AcOH
⃰ᗘࢆ 60㸣࡟ୗࡆࡿ࡜ Pu ࡣ⁐ฟࡋࡸࡍࡃ࡞ࡗࡓࠋ
୍᪉ࠊHCl ⃰ᗘࡢୖ᪼ࡣ Pu ⁐ฟࡢᢚไ࡟ຠᯝⓗ࡛࠶ࡗࡓࠋ௨ୖࡢ⤖ᯝ࠿ࡽࠊTh ࡢศ㞳࡟ࡣ 10࣒࢝ࣛᐜ㔞ࡢ 70%AcOH + 2M HCl + 0.1M HF ࡢΰྜ⁐፹ࢆ⏝࠸ࠊḟ࠸࡛␗࡞ࡿ⤌ᡂࡢ⁐㞳ᾮ࡛Pu ࢆศ㞳ࡍࡿࡇ࡜࡛ࠊ┠ⓗࡢ Pu ࢆྵࡴከඖ⣲㏲
Fig.1 Elution profiles of Th and Pu.
ḟศ㞳ἲࡢ㛤Ⓨ࡟ᡂຌࡋࡓࠋ
ᮏⓎ⾲࡟ࡣ⛉◊㈝ᇶ┙◊✲(C)(25340078)࠿ࡽࡢຓᡂࢆཷࡅ࡚ᚓࡽࢀࡓᡂᯝࡢ୍㒊ࡀྵࡲࢀࡿࠋ
ཧ⪃ᩥ⊩㸸(1) Y. Miyamoto et al., J. Nucl. Radiochem. Sci., 10 [2], 7 (2009).
Sequential separation of ultra-trace multi-elements including Pu
MIYAMOTO, Y., YASUDA, K., MAGARA, M..

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3B12

TIMS ࣇ࢕࣓ࣛࣥࢺୖ࡛⁐ゎࡋࡓࣉࣝࢺࢽ࣒࢘⢏ᏊࡢȘ⥺ᐃ

JAEA ‫ۑ‬Ᏻ⏣೺୍㑻ࠊ㕥ᮌ኱㍜ࠊ㔠⃝࿴ோࠊᐑᮏࣘࢱ࢝ࠊỤᆏᩥᏕࠊ㛫᯶ṇ᫂䛆䛿䛨䜑䛻䛇 JAEA ࡛ࡣࠊཎᏊຊ᪋タ➼࡟࠾ࡅࡿᮍ⏦࿌άືࢆ᳨▱ࡍࡿᡭẁࡢ୍ࡘ࡜ࡋ࡚ಖ㞀ᥐ⨨⎔ቃヨᩱศᯒᡭἲࡢ㛤Ⓨࢆᐇ᪋ࡋ࡚࠸ࡿࠋࡑࡢ୍⎔࡜ࡋ࡚ࠊ᪋タ➼࠿ࡽࡢᣔࡁྲྀࡾヨᩱ(ࢫ࣡࢖ࣉ)࡟௜╔ࡋࡓ᰾≀㉁ࢆྵࡴ⢏Ꮚࢆ SEM-EDX ࡟ࡼࡾ᳨ฟࡋࠊTIMS ࡟ࡼࡾྠ఩య⤌ᡂࢆศᯒࡍࡿᡭἲࢆ☜❧ࡋࡓ 1)ࠋ⢏Ꮚ࡟ྵࡲࢀࡿࣉࣝࢺࢽ࣒࢘ࡀᴟᚤ㔞࡞ሙྜࠊSEM-EDX ࡛ࡣ᳨ฟࡀᅔ㞴࡛࠶ࡗࡓࡓࡵࠊTIMS ࡟ࡼࡿྠ఩యẚศᯒ࡟ඛ❧ࡕࠊᅇ཰ࡋࡓ⢏Ꮚ୰ࡢࣉࣝࢺࢽ࢘
࣒ࡢ᭷↓ࢆ☜ㄆࡍࡿࡓࡵȘ⥺ ᐃࡢ㐺⏝ࢆ᳨ウࡋ࡚࠸ࡿࠋࡲࡓࠊࡇࡢȘ⥺ ᐃ࡟ࡼࡾṇ☜࡞
(238Pu+241Am)/(239Pu+240Pu)ᨺᑕ⬟ẚࡀᚓࡽࢀࢀࡤࠊ⥆ࡃ TIMS ࡟ࡼࡿࣉࣝࢺࢽ࣒࢘ࡢ㉁㔞ศᯒ⤖ᯝ࡜⤌ࡳྜࢃࡏࠊࣉࣝࢺࢽ࣒࢘⢭〇᫬ᮇࡢ᥎ᐃࡶྍ⬟࡜࡞ࡿࠋࡇࢀࡲ࡛࡟ࣉࣝࢺࢽ࣒࢘ᶆ
‽ヨᩱ(SRM947)࠿ࡽస〇ࡋࡓ⢏Ꮚࢆ ᐃࡋࡓ࡜ࡇࢁࠊ⢏ᚄࡀ 1 !m ࢆ㉸࠼ࡿ࡜⮬ᕫ྾཰ࡢᙳ
㡪࡟ࡼࡾࠊṇ☜࡞(238Pu+241Am)/(239Pu+240Pu)ᨺᑕ⬟ẚ ᐃࡀᅔ㞴࡛࠶ࡗࡓࠋࡑࡇ࡛ࠊTIMS ⏝Re ࣇ࢕࣓ࣛࣥࢺୖ࡟ࣉࣝࢺࢽ࣒࢘⢏Ꮚࢆ஌ࡏࡓ≧ែ࡛㓟⁐ゎࡍࡿ᪉ἲࢆ᳨ウࡋࡓࠋᮏⓎ⾲࡛ࡣࠊࣉࣝࢺࢽ࣒࢘⢏Ꮚࡢ⁐ゎ๓ᚋࡢ SEM ⏬ീ࡜Șࢫ࣌ࢡࢺࣝࢆ౛♧ࡋࠊຠᯝⓗ࡞᮲௳࡟ࡘ࠸᳨࡚ウࡋࡓࡢ࡛ሗ࿌ࡍࡿࠋ
䛆ᐇ㦂䛇 ࣉࣝࢺࢽ࣒࢘⢏Ꮚࡣࠊྠ఩యᶆ‽≀㉁(SRM947)⁐ᾮࢆ⵨Ⓨ஝ᅛᚋࠊ๐ࡾྲྀࡗ࡚స〇ࡋࡓࠋSEM ࡟ࡼࡾ⢏ᚄࢆィ ࡋࠊ⢏ᚄ 1.0㹼1.5 !m ࡢ 5 ⢏Ꮚࢆ SEM ୗ࡛ࣆࢵࢡ࢔ࢵࣉࠊࡑࢀ
ࡒࢀࡢ⢏Ꮚࢆ TIMS ⏝ Re ࣇ࢕࣓ࣛࣥࢺୖ࡟஌ࡏࡓࠋ
ࡇࡢࣇ࢕࣓ࣛࣥࢺࢆȘ⥺ ᐃ⿦⨨
㸦ORTEC〇 OCTETE-Plus, BU-024-600-AS㸧࡛ ᐃࡋࡓᚋࠊࣇ࢕࣓ࣛࣥࢺୖ࡛⢏Ꮚࢆ⁐ゎ࣭஝⇱ࡋࠊ෌ᗘȘ⥺ ᐃࡋࡓࠋ࡞࠾ࠊヨᩱ-᳨ฟჾ㛫㊥㞳ࡣ 5 mmࠊ ᐃ᫬㛫ࡣ 10 ୓⛊௨ୖ࡛࠶ࡿࠋ
䛆⤖ᯝ䛸⪃ᐹ䛇ᅗ 1 ࡟ࣇ࢕࣓ࣛࣥࢺୖ࡟ࣆࢵࢡ࢔ࢵࣉࡋࡓࣉࣝࢺࢽ࣒࢘⢏Ꮚࡢ SEM ⏬ീ౛ࢆ♧ࡍࠋࣇ࢕࣓ࣛࣥࢺୖ࡛ࣉࣝࢺࢽ࣒࢘⢏Ꮚ࡟ 68% HNO3 10 !L ࢆ⁲ୗࡋຍ⇕஝⇱ࡋࡓࡀࠊ⁐ゎ᧯స๓ᚋࡢȘ⥺ࢫ࣌ࢡࢺࣝ࡟ኚ໬ࡀぢࡽࢀ࡞࠿ࡗࡓࡓࡵࠊ68% HNO3 + 38% HF 10 !L ࡛෌⁐ゎࡋࡓࠋ⁐ゎ᧯సᚋࠊSEM ࡛⢏Ꮚࡀṧࡗ࡚࠸࡞࠸ࡇ࡜ࢆ☜ㄆࡋࠊȘ⥺ ᐃࡋࡓࠋ⁐ゎ๓ᚋࡢȘ⥺ࢫ࣌ࢡࢺࣝࢆᅗ 2 ࡟♧ࡍࠋࣇ࢕࣓ࣛࣥࢺୖࡢ᧯స࡛࠶ࡗ࡚ࡶ◪㓟-ࣇࢵ໬Ỉ⣲㓟ࡢΰ㓟ࢆ⏝࠸ࡓࣉࣝࢺࢽ࣒࢘⢏Ꮚࡢ⁐ゎࡣྍ⬟࡛࠶ࡗࡓࠋࡲࡓࠊ⁐ゎ๓ᚋࡢࢫ࣌ࢡࢺࣝ࠿ࡽ඲Ș⥺ࡢィᩘ⋡ࢆẚ㍑ࡋ࡚ࡶࠊኚ໬ࡀぢࡽࢀ࡞࠸ࡇ࡜
࠿ࡽࠊ⁐ゎ᧯స࡟
ࡼࡾࣇ࢕࣓ࣛࣥࢺ
⫼㒊࡬⁐ᾮࡀᅇࡾ
㎸ࢇ࡛࠸࡞࠸ࡇ࡜
ࡶ☜ㄆ࡛ࡁࡓࡢ࡛ࠊ
ᮏἲ࡟ࡼࡾᚑ᮶ࡼ
ࡾࡶ⢭ᗘࡼ࠸ᨺᑕ⬟ẚ ᐃࡀྍ⬟࡜ᅗ 2: ⢏Ꮚ⁐ゎ᧯స๓ᚋࡢȘ⥺ࢫ࣌ࢡࢺࣝ
ᅗ 1: ࣇ࢕࣓ࣛࣥࢺୖࡢࣉࣝࢺࢽ࣒࢘⢏Ꮚ⏬ീ
࡞ࡗࡓࠋ㻌
1)

D.Suzuki et al., Chem. Lett., 41, pp.90-91 (2012)
Alpha-ray measurement of dissolved plutonium particle on the TIMS filament
YASUDA, K., SUZUKI, D., KANAZAWA, K., MIYAMOTO, Y., ESAKA, F., MAGARA, M..

3B13◊✲ᆙ㐨ෆ࡟࠾ࡅࡿᖹ⾮➼౯ࣛࢻࣥ⃰ᗘཎᏊຊᶵᵓ  ‫⏣ྂۑ‬ᐃ᫛ࠊụ⏣ᖾ႐ࠊぢ᥃ಙ୍㑻ࠊ௒ᯞ㟹༤ࠊỌᓮ㟹ᚿࠊ㕥ᮌ ୍ࠊ㔝ᮧᖾᗈ䛆⥴ゝ䛇ཎᏊຊᶵᵓ䛾⍞ᾉ㉸῝ᆅᒙ◊✲ᡤ䛷䛿䚸㧗䝺䝧䝹ᨺᑕᛶᗫᲠ≀䛾ᆅᒙฎศᢏ⾡䛻㛵䛩䜛◊✲㛤Ⓨ䛸䛧䛶䚸❧ᆙ䜔Ỉᖹᆙ㐨䛛䜙䛺䜛ᆅୗ◊✲ᆙ㐨䜢タ⨨䛧䚸ᆅୗỈ䛾Ỉᅽ䜔Ỉ㉁䛾ほ 䛺䛹䜢ᐇ᪋䛧䛶䛔䜛䚹◊✲ᡤ࿘㎶䛿ⰼᓵᒾᆅᖏ䛷䛒䜛䛣䛸䛛䜙䚸2012 ᖺ䚸2013 ᖺ䛻◊✲ᆙ㐨ෆ䛷ᖹ⾮➼౯䝷䝗䞁⃰ᗘ䜢 ᐃ䛧సᴗ⪅䛾⥺㔞ホ౯䜢⾜䛳䛯䚹䛆 ᐃ䛇2012 ᖺ 5 ᭶䛛䜙 12 ᭶䚸ཬ䜃 2013 ᖺ 6 ᭶䛛䜙 12 ᭶䛻䛛䛡䛶䚸୺䛸䛧䛶ᖹ⾮➼౯䝷䝗䞁⃰ᗘᐃჾ WLM-Plus(Tracerlab ♫〇䠅䜢⏝䛔䛶᩿⥆ⓗ䛻 ᐃ䛧䛯䚹 ᐃ䛿䚸㐣ཤ䛾 ᐃ䛷ẚ㍑ⓗ㧗䛔್䛜ほ 䛥䜜䛯῝ᗘ 300m 䛾Ỉᖹᆙ㐨䛾஧⟠ᡤ䛷ᐇ᪋䛧䛯䚹䛆 ᐃ⤖ᯝ䛇Ꮨ⠇ⓗ䛺ኚ໬䛸䛧䛶ኟᏘ䛻㧗䛟䛺䜛ഴྥ䛜ぢ䜙䜜䛯䚹䛣䜜䛿እẼ 䛜㧗䛔䛣䛸䛻䜘䜚ᆅୗᆙ㐨䛾⮬↛᥮Ẽ䛜ᢚไ䛥䜜䛯䛯䜑䛸⪃䛘䜙䜜䜛䚹᪥ኚ໬䛸䛧䛶䛿䚸㏦㢼ᶵ೵Ṇᚋ䛾ኪ㛫䛻⃰ᗘ䛜㧗䛟䛺䜛ഴྥ䛜ぢ䜙䜜䜛䛸ྠ᫬䛻䚸ኟᏘ䛻㏦㢼ᶵ㐠㌿┤ᚋ䛻ᢲ䛧ฟ䛥䜜䛯䝷䝗䞁䛻䜘䜛䛸ᛮ䜟䜜䜛䝢䞊䜽≧䛾⃰ᗘኚ໬䛜ぢ䜙䜜䚸䛣䛾᫬䛻᭱኱್ 3,300 Bq/ੑ䛜ほ 䛥䜜䛯䚹䛆⥺㔞ホ౯䛇సᴗ⪅䛿ほ ᶵჾ䛾Ⅼ᳨䜔䝕䞊䝍ᅇ཰➼䛷ᙜヱሙᡤ䛻ධᆙ䛩䜛䛯䜑䚸䛭䛾⥺㔞ホ౯䜢⾜䛳䛯䚹⿕䜀䛟⥺㔞䛿䚸ᅜ㐃⛉Ꮫጤဨ఍ሗ࿌(2000 ᖺ)䛾⥺㔞᥮⟬ᐃᩘ 9×10-6㻌 mSv/(Bq䡡h/ੑ)䜢
⏝䛔䛶⟬ฟ䛧䛯䚹῝ᗘ 300m 䜈䛾㏦㢼ᶵ䛾㐠㌿䛿䚸ධᆙ䛜ணᐃ䛥䜜䛶䛔䛺䛔ఇ᪥䛿೵Ṇ䛩䜛䛜䚸ᖹ᪥䛿㐠㌿䛥䜜䜛䚹䛣䛾㏦㢼ᶵ䛾㐠㌿䛻క䛳䛶ᖹ⾮➼౯䝷䝗䞁⃰ᗘ䛜኱䛝䛟ኚ໬䛩䜛䛣䛸䛛䜙䚸⥺㔞ホ౯䛻䛴䛔䛶䛿䚸సᴗ⪅䛾ධᆙ᫬㛫ᖏ 10 ᫬䡚15 ᫬䛾䝕䞊䝍䜢ᇶ䛻⟬ฟ䛩䜛䛣䛸䛸䛧䛯䚹 ᐃჾ䛷グ㘓䛥䜜䜛䝕䞊䝍䛜ṇ᫬๓ 1 ᫬㛫䛾ᖹᆒⓗ䛺⃰ᗘ䜢♧䛧䛶䛔䜛䛯䜑䚸䛭䛾᫬㛫ᖏ䜢ྵ䜐䝕䞊䝍䜢ホ౯ᑐ㇟䛸䛧䛶㏦㢼ᶵ㐠㌿୰䛾 11 ᫬䡚15 ᫬䛾䝕䞊䝍䜢ᢳฟ䛧䛶㞟ィ䛧䛯䚹䜎䛯䚸Ᏻ඲ഃ䛾ホ౯䛸䛺䜛䜘䛖䚸஧⟠ᡤ䛷ᚓ䜙䜜䛯⃰ᗘ䛾䛖䛱㧗䛔᪉䛾್䜢ホ౯䛻⏝䛔䛯䚹䛆ホ౯⤖ᯝ䛇᭶ẖ䛻ධᆙ᫬㛫ᖏ䛾᭱኱⃰ᗘ䠄䠍᫬㛫್䠅䛸䚸䛭䛾᭶䛾ᖹᆒ⃰ᗘ䜢⟬ฟ䛧䛯⤖ᯝ䜢ୗ⾲䛻♧䛩䚹䛺䛚䚸2012 ᖺ 5 ᭶䡚7 ᭶䛻䛴䛔䛶䛿䚸ධᆙ᫬㛫ᖏ䛾䝕䞊䝍䛿Ꮡᅾ䛧䛺䛔䚹᭱኱⃰ᗘ䛿 2013
ᖺ 7 ᭶䛾 1,880 Bq/ੑ䛷䛒䜚䚸᭶ẖ䛾ᖹᆒ⃰ᗘ䛾᭱኱䛿 2013 ᖺ 8 ᭶䛾 765 Bq/ੑ䛷䛒䛳䛯䚹䛣䜜䛿䚸7 ᭶ 16 ᪥䛛䜙ᐇ᪋䛧䛯㏦㢼ᶵ䛾㐃⥆㐠㌿䛻䜘䜚䚸䝕䞊䝍䛜Ᏻᐃ䛧䝢䞊䜽≧䛾್䛜ほ 䛥䜜䛺䛟䛺䛳䛯䛜䚸7 ᭶䛸ẚ㍑䛩䜛䛸඲యⓗ䛻⃰ᗘ䛜㧗䛟䛺䛳䛯䛯䜑䛸⪃䛘䜙䜜䜛䚹⥺㔞ホ౯䛻ᙜ䛯䛳䛶䛿䚸᭶ẖ䛾ᖹᆒ⃰ᗘ䜢⏝䛔䛶䚸ධᆙグ㘓䛛䜙సᴗ᫬㛫䜢ẖ᭶ 10 ᫬㛫䛸௬ᐃ䛧䛶ホ౯䛧䛯䚹సᴗ⪅䛾⿕䜀䛟㔞䛾᭶᭱኱್䛿ୗ⾲䛾᭱ୗẁ䛻♧䛩䜘䛖䛻 2013 ᖺ 8 ᭶䛾⣙ 0.069 mSv 䛸䛺䛳䛯䚹ᖺ㛫⥺㔞⟬ฟ䛻ᙜ䛯䛳䛶䛿䚸⾲䛻♧䛩௚䛾᭶䛿䝕䞊䝍䛜䛺䛔䛯䜑䛭䛾๓ᚋ䛾᭶ᖹᆒ⃰ᗘ䛸ྠ䛨䛸௬ᐃ䛧䚸9 ᭶䛸 11 ᭶䛻䛴䛔䛶䛿 2012 ᖺ䛾᪉䛜㧗䛔䛯䜑Ᏻ඲ഃ䛻 2012 ᖺ䛾್䜢⏝䛔䚸௚䛾᭶䛿 2013 ᖺ䛾್䜢⏝䛔䛶㞟ィ䛧䛯䚹䛭䛾⤖ᯝ䚸సᴗ⪅䛾ᖺ㛫⥺㔞䛿⣙ 0.35 mSv 䛸䛺䜚䚸බ⾗䛾⥺㔞㝈ᗘ䛷䛒䜛 1mSv 䜢㉸䛘䛶䛔䛺䛔䛣䛸䛜☜ㄆ䛥䜜䛯䚹䛺䛚䚸Ꮨ⠇ኚ໬䛸䛧䛶෤Ꮨ䛿⃰ᗘ䛜పୗ䛩䜛䛯䜑䚸௬ᐃ䛧䛯⃰ᗘ䜢⏝䛔䛶ホ౯䛧䛯ᖺ㛫⥺㔞䛿ᐇ㝿䜘䜚䜒኱䛝䛺್䛸䛺䛳䛶䛔䜛䛸⪃䛘䜙䜜䜛䚹
Table㻌 EECRn and estimated effective dose to workers
㻞㻜㻝㻞
㻞㻜㻝㻟
㼅㼑㼍㼞
㻹㼛㼚㼠㼔
㻭㼡㼓㻘
㻿㼑㼜㼠㻚
㻻㼏㼠㻚
㻺㼛㼢㻚 㻰㼑㼏㻚㻖 㻶㼡㼚㼑㻖 㻶㼡㼘㼥
㻭㼡㼓㻚㻖
㻿㼑㼜㻚
㻻㼏㼠㻚 㻺㼛㼢㻚㻖㻰㼑㼏㻱㻱㻯㻾㼚㻌㻹㼍㼤㼕㼙㼡㼙䠄㻮㼝㻛ੑ䠅 㻡㻞㻞
㻡㻣㻞
㻞㻟㻡
㻝㻟㻣
㻥㻤
㻠㻣㻥
㻝㻤㻤㻜
㻥㻤㻢
㻤㻞㻠
㻡㻣㻟
㻠㻜
㻝㻤㻠
㻠㻥㻞
㻝㻡㻣
㻝㻝㻡
㻥㻝
㻠㻜㻢
㻢㻤㻠
㻣㻢㻡
㻠㻞㻣
㻞㻟㻝
㻟㻣
㻝㻜㻢
㻌㻱㻱㻯㻾㼚㻌㻭㼢㼑㼞㼍㼓㼑䠄㻮㼝㻛ੑ䠅 㻟㻢㻟㻱㼒㼒㼑㼏㼠㼕㼢㼑㻌㻰㼛㼟㼑䠄㼙㻿㼢䠅 㻜㻚㻜㻟㻞㻣 㻜㻚㻜㻠㻠㻟 㻜㻚㻜㻝㻠㻝 㻜㻚㻜㻝㻜㻠 㻜㻚㻜㻜㻤㻞 㻜㻚㻜㻟㻢㻡 㻜㻚㻜㻢㻝㻢 㻜㻚㻜㻢㻤㻥 㻜㻚㻜㻟㻤㻠 㻜㻚㻜㻞㻜㻤 㻜㻚㻜㻜㻟㻟 㻜㻚㻜㻜㻥㻡*Data collected less than 3 days

EEC radon in underground research facilities (JAEA)
FURUTA,S., IKEDA,K., MIKAKE,S., IMAEDA,Y., NAGASAKI,Y., SUZUKI,H., NOMURA,Y.

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3B14!"#$%&'! ()*+, -./01-23456"!!!"# $%&!'()* +%,!-./0 1%2!345 6789:;< $%=>?@ +%AB3" 1%CDEF 6%G=HIJ!

!"#$! KL"IMNOPQR 10Be(STU 136 VW)X!Y>ZP[\KL"]!Y^_`a%ba]_NcdPIMeRfIMghijklmnopqreRst%!Y^_ 10Be uvXwvxyz{|f}s~mZm R 10Be uvXwvxyz{|fP
XZ_uv/ZmRm|uv!eRl_vxyz{XWWv] Rf10Be _¡¢£X!Y_¤PQR¥]%Z_uvwvxyz{|¥]¦§_¨©ªª]p«R¥]¬­R®¯°
QR%10Be X±²³p¥]^_uvxyX}´xµf~¥P¶·#PX¸¹_ 10Be uv_º»¼½!±z¾%uv_½¿ÀzÁÂ%vxy_MÃm|ÄÅeR¥]zÆÇ]psf!%&$ÈÉXÊË·#ÌÍÎÏ KH-09-5 \Ð (2009/11/6 Ñ 2010/1/10)m  CTD-CMS z«ÒÓps 20L _Ôz«sfÈÉmuÕb 20mL zÖ×b°mpsg%ØÙÚÛÜÝ (Fe 0.5g, Be 0.2mg)zÖ×sfui¸ÞßiÔ 25mL PØàázÁMpsfØáâzã
äpåæ¸çèPØzéê%ëæ¸çèP Be zìípsfîïp BeO ]p2ð!Ê
MALT m  10Be-AMS z¾µsf!'()*+$, ¸¹m R 10Be uv_vxy_½¿ÀzÀmñef500m òó_ 10Be
uvX^wvô 20-30°S Põ/%20°N ö÷] 40°S òºP¥]xµsf¥Xøù}Púû_QRü_wvxy]ýþeRf¥X^wvô!Y!¦§Þÿlm 
Rrqôm!"eRst%>Z!Yr#$_%&'Öp%>!Y_ 10Be uvÖps¥]m(Â))Z$ 10Be _áo'ÖpsstPQR]Ä×Rfº*
_v 300m ò¸¹_ 2000m òm+ 10Be uv_õÔ,»m-.m_/R¥]0Ósf¥X»!1ZÔ]º*ZÔ))psZ23Ô_xy]ýþpRf}sÌ>P±²4s56Õuv]78eR]%9bÕ%¸bÕ(Â:bÕm;xy]µsf!1_ 10Be uvX¥] 10Be XI4I<_õº*m =>_!"#_áq$%m&opqrp%300m òPáq$%_xä]]'mã
äp%&Ö4»#+$()pR]Ä×RfÀ! ¸¹_Ô^ 10Be uv_º»½¿ÀNorth-south transection of Be-10 concentration in seawater in the Indian Ocean
YAMAGATA, T., INOUE, K., TAZOE, H., MATSUZAKI, H., NAGAI, H.

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3B15ኳ↛㖔≀ࢆ฼⏝ࡋࡓࣃࣝࢫගບ㉳⺯ගἲࡢ⥺㔞 ᐃ࡬ࡢ㐺⏝ཎᏊຊᶵᵓ  ‫⏣⸨ۑ‬༤႐ 䛆⥴ゝ䛇ኳ↛㖔≀࠿ࡽࡢᨺᑕ⥺ㄏ㉳ගບ㉳⺯ග㸦OSL㸧⌧㇟ࡣࠊ⥺㔞 ᐃࡸᖺ௦ ᐃ࡟฼⏝ࡉࢀ࡚࠸ࡿࠋࡋ࠿ࡋࠊࡇࢀࡲ࡛ࡢ OSL ᐃ㸦㐃⥆ⓗ࡟ບ㉳ගࢆ↷ᑕࡍࡿ᪉ἲ㸧࡛ࡣࠊ▼ⱥ௨እࡢ㖔≀࠿ࡽࡢ⺯ගࡣ ᐃ᫬࡟ጉᐖ࡜࡞ࡿࡓࡵ࡟ࠊ┠ⓗ㖔≀࡛࠶ࡿ▼ⱥࢆ◁฼ࡸ▼ᮦ➼࠿ࡽᢳฟࡍࡿᚲせࡀ࠶ࡗࡓࠋ
㏆ᖺࠊᾏእࡢ◊✲⪅ࡀࠊࣃࣝࢫ OSL ᐃἲ㸦ࣃࣝࢫⓗ࡟ບ㉳ගࢆ↷ᑕࡍࡿ᪉ἲ㸧ࡣࠊ▼ⱥࡢ OSL ࢆࡑࡢ௚ࡢ㖔≀࠿ࡽࡢ OSL ࡜ᘚูࡋ࡚ ᐃ࡛ࡁࡿྍ⬟ᛶࢆ♧ࡋࡓࠋࡑࡇ࡛ࠊࡇࡢ᪉
ἲࢆ⥭ᛴ᫬ࡢ⥺㔞 ᐃἲ࡟ᛂ⏝ࡍࡿࡇ࡜ࢆ⪃࠼ࠊ ᐃჾࡢ㛤Ⓨࠊ ᐃ᮲௳ࡢ᭱㐺໬ࢆ⾜࠸ࠊᐇヨᩱ࡬ࡢ㐺⏝ヨ㦂ࢆ⾜ࡗࡓࠋ䛆ᐇ㦂䛇 ࡲࡎࠊࣃࣝࢫ OSL ᐃ⿦⨨ࢆ㛤Ⓨࡋࠊບ㉳ගࣃࣝࢫࡢᖜ࡜㛫㝸ࠊ᳨ฟࡉࢀࡿࣃࣝࢫ
OSL ࡢ≉ᛶ࡟ಀࡿヨ㦂ࢆᐇ᪋ࡋࡓࠋ࡞࠾ࠊࡇࡢᛶ⬟ヨ㦂࡟ࡣࠊ㖔≀ᶆᮏ࠿ࡽᢳฟࡋࡓ▼ⱥཬࡧ㛗▼ࢆ౑⏝ࡋࡓࠋḟ࡟ࠊⲈᇛ┴ෆࡢ⚄♫࡟࠾࠸࡚᥇ྲྀࡋࡓ⾲ᅵࢆ౑⏝ࡋ࡚ࠊࣃࣝࢫ OSL ᐃ᮲௳ࡢ᭱㐺໬ࢆ⾜ࡗࡓࠋ⾲ᅵࡣ 9 ᆅⅬ࡛᥇ྲྀࡋࠊ2 ᆅⅬࡢ⾲ᅵ࠿ࡽ▼ⱥࢆᢳฟࡋࡓࠋࡇࡢ▼ⱥ࡜㖔≀ᶆᮏ࠿ࡽ㑅ᢥࡋࡓ㛗▼ࢆΰྜࡋࠊࡇࢀ࡟୍ᐃ⥺㔞㸦4.2 Gy㸧ࡢ X ⥺ࢆ↷ᑕࡋࡓࠋࡇࡢヨᩱ࡟ࣃࣝࢫ
OSL ᐃἲࢆ㐺⏝ࡋࠊᚓࡽࢀࡿ⥺㔞್ࡀ 4.2 Gy ࡜࡞ࡿ ᐃ᮲௳ࢆồࡵࡓࠋࡑࡢᚋࠊࡇࡢ ᐃ᮲௳࡛ࠊ୍ᐃ⥺㔞㸦4.2 Gy㸧ࢆ↷ᑕࡋࡓ⾲ᅵࡢ⥺㔞ࢆ෌⌧࡛ࡁࡿ࠿࡝࠺࠿࡟ࡘ࠸࡚ࡢヨ㦂ࢆࡋࡓࠋ᭱ᚋ࡟ࠊி㒔኱ᏛཎᏊ⅔ᐇ㦂ᡤࡢᡤ᭷ࡍࡿᶆ‽Ț⥺※୍࡛ᐃ⥺㔞㸦4.3 Gy㸧ࢆ↷ᑕࡋࡓ㸷ᆅ
Ⅼࡢ⾲ᅵࡢ⥺㔞 ᐃࢆࣃࣝࢫ OSL ᐃἲ࡛⾜࠸ࠊᮏ᪉ἲࡢጇᙜᛶࢆホ౯ࡋࡓࠋ࡞࠾ࠊࡇࢀࡽࡢᐇ㦂࡟࠾࠸࡚ࡣࠊ᥇ྲྀࡋࡓ⾲ᅵ࡟ኴ㝧ᶍᨃ⿦⨨ࢆ౑⏝ࡋ࡚ග↷ᑕࢆ⾜࠸ࠊࡑࢀࡽࡢ⾲ᅵࡀグ᠈ࡋ࡚࠸ࡓ㐣ཤࡢᨺᑕ⥺↷ᑕࡢᙳ㡪࡟ࡘ࠸࡚ࡣࠊྲྀࡾ㝖࠸ࡓࡶࡢࢆ౑⏝ࡋࡓࠋ䛆⤖ᯝ䛇⿦⨨ࡢᛶ⬟ヨ㦂࡟࠾࠸࡚ࠊ࢜ࢩࣟࢫࢥ࣮ࣉࢆ⏝࠸࡚ࠊࡑࡢບ㉳ගࡢࣃࣝࢫᖜࡀ᭱ᑠ࡛
ȣ⛊࡛࠶ࡿࡇ࡜㸦ȣ⛊࠿ࡽ ȣ⛊࡛タᐃྍ⬟㸧ࠊࡑࡢࣃࣝࢫ㛫㝸ࡀ᭱ᑠ࡛ ȣ⛊࡛࠶ࡿࡇ࡜㸦㹼ȣ⛊࡛タᐃྍ⬟㸧ࢆ☜ㄆࡋࠊᙜึィ⏬ࡋࡓ⿦⨨ࡢᛶ⬟ࡢᚓࡽࢀ࡚࠸ࡿࡇ࡜ࡀศ
࠿ࡗࡓࠋࡉࡽ࡟ࠊ㖔≀ᶆᮏࡢ▼ⱥ࡜㛗▼ࢆ౑⏝ࡋ࡚ࠊࣃࣝࢫ 26/ ᐃࢆ⾜࠸ࠊᾏእࡢ◊✲⪅࡜ྠᵝ࡞ࣃࣝࢫ 26/ ࡢಙྕࢆᚓࡽࢀࡓࠋ ḟ࡟ࠊ㸰ᆅⅬࡢ⾲ᅵ࠿ࡽᢳฟࡋࡓ▼ⱥ࡜㛗▼ࡢΰྜ≀࡟ࠊࣃࣝࢫ OSL ࡢ ᐃ᮲௳ࢆኚ໬ࡉ
ࡏࠊᚓࡽࢀࡿ⥺㔞್ࢆồࡵࡓ࡜ࡇࢁࠊࣃࣝࢫᖜࡀ 40ȣsࠊࣃࣝࢫ㛫㝸ࡀ 200ȣ⛊ࡢ⤌ࡳྜࢃࡏࡢ᫬࡟ࠊ᭱ࡶࡼࡃ↷ᑕࡉࢀࡓ⥺㔞࡜୍⮴ࡋࡓࠋࡇࡢࣃࣝࢫ OSL ᐃ᮲௳࡛ࠊ↷ᑕࡋࡓ⾲ᅵࡢ⥺㔞್ࢆồࡵࡓ࡜ࡇࢁࠊྠᵝ࡟↷ᑕࡋࡓ⥺㔞࡜୍⮴ࡋࡓࠋࡼࡗ࡚ࠊࣃࣝࢫ OSL ᐃ᮲௳ࡣࠊ
ୖグࡢࣃࣝࢫᖜ࡜㛫㝸࡟Ỵᐃࡋࡓࠋ࡞࠾ࠊࡇࡢ ᐃ࡟࠾ࡅࡿ᳨ฟୗ㝈್ࡣࠊ0.3㹼1 Gy ࡛࠶ࡗࡓࠋ ᭱ᚋ࡟ࠊȚ⥺ࢆ↷ᑕࡋࡓ 9 ᆅⅬࡢ⾲ᅵ࡟ࠊࣃࣝࢫ OSL ᐃἲࢆ㐺⏝ࡋ࡚⥺㔞್ࢆồࡵࡓ࡜
ࡇࢁࠊ6 ᆅⅬࡢ⾲ᅵ࡛ࠊ↷ᑕࡋࡓ⥺㔞࡜୍⮴ࡋࡓ⥺㔞್ࢆᚓࡿࡇ࡜ࡀ࡛ࡁࡓࠋࡋ࠿ࡋࠊ3 ᆅⅬࡢ⾲ᅵ࡛ࡣࠊ⥺㔞್ࡀ␗࡞ࡗࡓࡓࡵࠊࡇࡢࣃࣝࢫ OSL ᐃἲࡢ㐺⏝⠊ᅖ࡟ࡘ࠸࡚ࡣࠊ௒ᚋࡉ
ࡽ࡟◊✲ࢆ㐍ࡵࡿᚲせࡢ࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ
Application of pulsed optically stimulated luminescence using natural mineral to retrospective
dosimetry
Fujita, H..

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3B16

ᨺᑕ⥺⪏ᛶࢆᣢࡘ⦆Ṍື≀ࢡ࣐࣒ࢩ࡟㛵ࡍࡿ◊✲㟼኱ᢏ⾡㒊 ࠊ㟼኱㝔⌮  ‫ۑ‬ᐑ⃝ಇ⩏ ࠊ኱▮ᜤஂ 䛆⥴ゝ䛇 ࢡ࣐࣒ࢩࡣࠊ⠇㊊ື≀࡟㏆⦕ࡢ⦆Ṍື≀㛛࡟ྵࡲࢀࠊయ㛗 1㹫㹫௨ୗࡢỈ⏕⏕≀࡛࠶ࡾࠊ㝣ୖࡢࢥࢣࡢ୰࠿ࡽ῝ᾏࡲ࡛ࠊᆅ⌫ୖࡢ࠶ࡽࡺࡿᡤ࡟ศᕸࡋ࡚࠸ࡿࠋ⫥ࡣ 4 ᑐ࠶ࡾࠊ⠇㊊ື≀ࡢᵝ࡞㛵⠇ࡣ↓ࡃࠊ⫥ࡢඛ࡟ࡣ∎ࡀ࠶ࡿࠋ⬺⓶ࢆ⧞ࡾ㏉ࡋ࡚ᡂ㛗ࡋࠊ⬺⓶ࡋࡓẆ࡟༑ᩘಶࡢ༸ࢆ⏘ࡴࠋࡇࡢࢡ࣐࣒ࢩࡢ᭱኱ࡢ≉ᚩࡣࠊỈศࡀ↓ࡃ࡞ࡾ஝⇱≧ែ࡟࡞ࡿ࡜ࠊ⮬ࡽయࢆ⦰ࡵ࡚ᶡ≧࡟࡞ࡾࠊఇ╀≧ែ࡟࡞ࡿࠋ
ࠕࢡࣜࣆࢺࣅ࢜ࢩࢫࠖ࡜ゝࢃࢀࡿࡇࡢఇ╀≧ែ࡟࡞ࡿ࡜ࠊᵝࠎ࡞ࢫࢺࣞࢫ⪏ᛶࢆᣢࡘࡼ࠺࡟࡞ࡿࠋⓒᖺ௨ୖ⏕ࡁࡿࠊ㧗 ࡸ㉸ప ࠊ┿✵ࡸ㧗Ẽᅽࠊ≉࡟ᨺᑕ⥺࡟ࡣ࡝ࢇ࡞ᨺᑕ⥺࡟ࡶ⪏࠼ࡿ࡜ゝࢃࢀ࡚ࡁࡓࠋࡋ࠿ࡋࠊࢡ࣐࣒ࢩࡢࢫࢺࣞࢫ⪏ᛶࡢ≉࡟ᨺᑕ⥺⪏ᛶ࡟㛵ࡍࡿሗ࿌ࡣᑡ࡞࠸ࠋⓎ⾲⪅ࡣ㟼ᒸ኱Ꮫ⌮Ꮫ㒊㝃ᒓᨺᑕ⛉Ꮫ◊✲᪋タࡢ
74T60CoȚ⥺↷ᑕ⿦⨨ࢆ౑⏝ࡋ࡚ࠊᨺᑕ⥺↷ᑕᐇ㦂࠿ࡽࢡ࣐࣒ࢩࡢᨺᑕ⥺⪏ᛶࡢ㝈⏺್ࢆ᥈ࡗࡓࠋ࠶ࢃࡏ࡚㧗 ࣭ప ࡢࢫࢺࣞࢫ⪏ᛶᐇ㦂ࡶ⾜ࡗࡓࡢ࡛ࠊሗ࿌ࡍࡿࠋ
䛆ᐇ㦂䛇 ࢡ࣐࣒ࢩࡣ࡝ࡢࢥࢣ࡟ࡶ࠸ࡿࢃࡅ࡛ࡣ࡞ࡃࠊᕷ⾤ᆅ࡟ከࡃぢࡽࢀࡿࠊࢠࣥࢦࢣࡢ୰࡟
㧗☜⋡࡛࠸ࡿ஦ࡀศ࠿ࡗࡓࠋࢠࣥࢦࢣࢆ᥇㞟ࡋ࡚ࡁ࡚ࠊỈࢆᙇࡗࡓࢩ࣮ࣕࣞ࡟༙᪥ᾐࡍ࡜ࠊ
ࢡ࣐࣒ࢩࡀఇ╀≧ែ࠿ࡽぬࡵ࡚ࠊỈ୰࡛ືࡁฟࡍࠋほᐹࡉࢀࡓࢡ࣐࣒ࢩࡣࠊ࢜ࢽࢡ࣐࣒ࢩ࡜
ࢳ࣓ࣙ࢘࢖࣒ࢩ࡛࠶ࡗࡓࡀࠊ኱ᆺ࡛ᩘࡀከ࠸࢜ࢽࢡ࣐࣒ࢩ㸦Milnesium tardigradum㸧ࢆᐇ㦂࡛౑⏝ࡋࡓࠋỈ୰ࡢ࢜ࢽࢡ࣐࣒ࢩࢆ࣐࢖ࢡࣟࣆ࣌ࢵࢺ࡛྾࠸ྲྀࡾࠊࢁ⣬ୖ࡟⛣ࡍ࡜Ỉศࡀᢤࡅ࡚ḟ➨࡟యࢆ⦰ࡵࠊࢁ⣬ࡀ᏶඲࡟஝ࡃ࡜ࠊ᭱ᚋࡣᶡ≧࡟࡞ࡗ࡚ఇ╀≧ែ࡟ධࡿࠋࡇࡢ≧ែࡢࢡ࣐࣒ࢩࢆỈ࡟ᾐࡍ࡜ࠊయࢆఙࡤࡋ࡚ఇ╀≧ែ࠿ࡽぬࡵࠊඖࡢᙧែ࡟ᡠࡾືࡁฟࡍࠋ௨ᚋࡢ
ᐇ㦂ࡣࡇࡢᶡ≧ࡢ࢜ࢽࢡ࣐࣒ࢩࢆ౑⏝ࡋ࡚ᐇ㦂ࢆ⾜ࡗࡓࠋ(1) ෭෾ᗜ㸦-20Υ㸧࡟୍ᬌධࢀ࡚෾ࡽࡏ࡚࠿ࡽࠊྲྀࡾฟࡋ࡚Ỉࢆຍ࠼ࡿࠋ
(2) ࢻࣛ࢖࢔࢖ࢫ㸦-78Υ㸧ୖ࡟ࠊఇ╀≧ែࡢ࢜ࢽࢡ࣐࣒ࢩࢆࢁ⣬ࡈ࡜஌ࡏ࡚ࠊ1 ᫬㛫⨨ࡃࠋ(3) ࣐࢖ࢡࣟࢳ࣮ࣗࣈ࡟ࠊఇ╀≧ែࡢ࢜ࢽࢡ࣐࣒ࢩࢆࢁ⣬ࡈ࡜ධࢀ࡚ࠊᾮయ❅⣲㸦-195Υ㸧࡟
10 ศ㛫ᾐࡋ࡚࠿ࡽྲྀࡾฟࡋ࡚ࠊỈࢆຍ࠼ࡿࠋ
(4) 㟁Ꮚࣞࣥࢪ࡟ఇ╀୰ࡢ࢜ࢽࢡ࣐࣒ࢩࢆࢁ⣬ࡈ࡜ධࢀ࡚ࠊ3 ศ㛫ຍ⇕ࡍࡿࠋ(5) 60CoȚ⥺↷ᑕ⿦⨨࡛ࠊఇ╀≧ែࡢ࢜ࢽࢡ࣐࣒ࢩ࡟ 1000Gy,2000Gy,3000Gy,4000Gy,5000Gy
ࢆ↷ᑕࡍࡿࠋ䛆⤖ᯝ䛇㻌(1) ప ᐇ㦂ࡣࠊ෭෾ᗜࠊࢻࣛ࢖࢔࢖ࢫࠊᾮయ❅⣲࡜ࡶ࡯ࡰࡍ࡭࡚ࡢᐇ㦂ಶయ࡛ࠊఇ╀࠿ࡽぬࡵ࡚ືࡁฟࡍ஦ࡀ☜ㄆࡉࢀࡓࠋ
(2) 㟁Ꮚࣞࣥࢪ࡛ຍ⇕ᐇ㦂ࡣࠊࡍ࡭࡚ࡢಶయ࡛ఇ╀࠿ࡽぬࡵ࡚ືࡁฟࡍࡢࡀ☜ㄆ࡛ࡁࡓࠋ
(3) Ț⥺↷ᑕᐇ㦂࡛ࡣࠊ4000Gy ࡲ࡛ࠊఇ╀≧ែ࠿ࡽぬࡵࡿ஦ࡀศ࠿ࡗࡓࠋ࡞࠾↷ᑕᚋࡢᑑ࿨
ࡣࠊ㧗⥺㔞↷ᑕ࡟࡞ࡿ࡜▷ࡃ࡞ࡿ஦ࡀศ࠿ࡗࡓࠋ
ᮏᐇ㦂࠿ࡽࠊ
࢜ࢽࢡ࣐࣒ࢩ࡟ࡣప ࠊ㧗 ࡟⪏ᛶࡀ᭷ࡿ஦ࡀ☜ㄆ࡛ࡁࡓࠋ
ࡲࡓᨺᑕ⥺ࡣࠊ4000Gy
ࡲ࡛⪏࠼ࡿ஦ࡀศ࠿ࡗࡓࡀࠊ㧗⥺㔞↷ᑕ࡛ࡣ↷ᑕᚋࡢᑑ࿨ࡀ▷ࡃ࡞ࡿ஦ࡀ♧၀ࡉࢀࡓࠋ

Study on tardigrades with radiation resistance
MIYAZAWA,T.,OYA,Y.

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