研究発表要旨
9 月 30 日（水）3A01 〜 3A13：口頭発表

A 会場（国際会議場）

− 108 −− 109 −3A03㞷ị୰ࡢࢲࢫࢺ⢏Ꮚ࡟ྵࡲࢀࡿேⅭ㉳※≀㉁ẚࡢ᥎ᐃᮾ኱㝔⥲ྜ ࠊཎᏊຊᶵᵓ  ‫ۑ‬ᑠ㇋ᕝ຾ぢ ࠊᯇᑿᇶஅ 1ࠊ኱ᓥ┿⃈ 2ࠊ ⸨ᬸ㍜ 2ࠊ
ᮌᮧᩔ 2ࠊᑠἨග⏕ 2[ࡣࡌࡵ࡟] ᮏ◊✲࡛ࡣ㝆㞷⎔ቃࡢ␗࡞ࡿᅜෆࡢ」ᩘࡢᆅⅬ࡟࠾࠸࡚෤ᮇ࡟✚㞷ࡋࡓ㞷ịヨᩱࢆ᥇ྲྀࡋࠊࡑࡢ୰࡟ྵࡲࢀࡿ኱Ẽ⢊ሻ(ࢲࢫࢺ)୰ࡢ⢒኱⢏Ꮚࡢ Enrichment Factor(EF)࡟╔┠ࡍࡿࡇ࡜࡟
ࡼࡗ࡚ࠊ෤ᮇᏘ⠇㢼࡟ࡼࡗ࡚㢼㏦ࡉࢀࡓྛඖ⣲ࡢேⅭ㉳※≀㉁ẚࡢ᳨ウࢆ⾜ࡗࡓࠋ㞷ị୰ࡢࢲࢫࢺ⃰ᗘࡣᴟࡵ࡚ᕼⷧ࠿ࡘ㧗࣐ࢺࣜࢡࢫ࡛࠶ࡾࠊࡑࡢᐃᛶ㺃ᐃ㔞࡟ࡣࣂࢵࢡࢢࣛ࢘ࣥࢻࡀపࡃ㧗ឤᗘ࡞ศᯒᡭἲࡀᮇᚅࡉࢀࡿࡓࡵᚑ᮶ࡢᶵჾ୰ᛶᏊᨺᑕ໬ศᯒ(INAA)ἲ࡟ຍ࠼ࠊከ㔜༶Ⓨ࣐࢞ࣥ⥺ศᯒ(MPGA)ἲ࡟ࡼࡿ ᐃࡶ⾜࠸ࠊᕼⷧヨᩱ࡟࠾ࡅࡿ ᐃ᮲௳ࡢ᭱㐺໬ࢆヨࡳࡓࠋ[ᐇ㦂] ศᯒ࡟౪ࡋࡓヨᩱࡣ 07-08 ࢩ࣮ࢬࣥ࡟୸ᒣ(᪂₲)ࠊ❧ᒣ㐃ᓠ(ᐩᒣ-㛗㔝┴ቃ)ࠊ㔠⢭ᓘ(⩌㤿ᰣᮌ┴ቃ)࡛᥇ྲྀࡉࢀࡓ✚㞷࡛࠶ࡿࠋ᥇ྲྀᆅⅬ࿘㎶࡛ࡣ⼥㞷࡟ࡼࡿ run-off ࡢྍ⬟ᛶࡣᴟࡵ࡚ప࠸࡜
ุ᩿ࡋࠊ㝆㞷௨እࡢࢲࢫࢺ౪⤥※ࡣ࡞࠸࡜⪃࠼ࡓࠋ᥇ྲྀࡋࡓヨᩱࡣ⮬↛⼥ゎᚋࠊΎί࡞⎔ቃୗ࡛
Ꮝᚄ 0.45ȝm ࡢ࣓ࣥࣈࣛࣥࣇ࢕ࣝࢱ୍࣮࡛ᐃ㔞ℐ㐣ࡋࡓࠋℐ⣬ࡣ㐺ษ࡞ࢧ࢖ࢬ࡟ษ᩿ࡋࠊ࣏࢚ࣜࢳ
ࣞࣥ࠾ࡼࡧ FEP ࣇ࢕࣒࡛ࣝࢩ࣮ࣝࡋࡓࠋSTELLA ࡟ࡼࡿ MPGA ᐃ࡛ࡣ 24 ྎࡢ Ge ᳨ฟჾ(BGOྵࡴ)ࢆ⏝࠸࡚ Ǆ-Ǆ ᐃࢆ⾜࠸ࠊヨᩱẖ࡟ 1 ᫬㛫ࡢ ᐃࢆ 5 ᅇ⧞ࡾ㏉ࡋࡓࠋྛࣜࢫࢺࢹ࣮ࢱࢆࢯ࣮
ࢸ࢕ࣥࢢࡋ 2 ḟඖ࣐ࢺࣜࢡࢫྠኈࢆ₇⟬ࡍࡿࡇ࡜࡟ࡼࡗ࡚ࠊ1 ᫬㛫࠿ࡽ 5 ᫬㛫ࡲ࡛ࡢ⣼✚ ᐃ᫬㛫ࡢ⤖ᯝࢆᚓࡓࠋࡲࡓࣈࣛࣥࢡ(ℐ⣬)ࡢ࢜ࣇࢭࢵࢺࡶୖグࡢᡭἲ࡟ࡼࡾ⪃៖ࡋࡓࠋ࡞࠾ℐ⣬ୖ࡟࠶ࡿࢲࢫࢺヨᩱࡢṇ࿡ࡢ㔜㔞ࡣ ᐃࡍࡿࡇ࡜ࡀᅔ㞴࡛࠶ࡿࡓࡵࠊᶆ‽ཧ↷ヨᩱ࡜ࡢẚ㍑࠿ࡽᚓࡽࢀ
ࡿ㔜㔞್࠿ࡽ EF ࢆồࡵࡓࠋࡲࡓ S ࡟ࡘ࠸࡚ࡣ㧗࢚ࢿࣝࢠ࣮ຍ㏿ჾ◊✲ᶵᵓ Photon Factroy ࡟࠾࠸࡚ X ⥺྾཰ᚤ⣽ᵓ㐀(XAFS)ἲࢆྠヨᩱ࡟㐺⏝ࡋࡓࠋ[⤖ᯝ࡜⪃ᐹ] ⾲࡟୸ᒣ࠾ࡼࡧᐊᇽ(❧ᒣ㐃ᓠ㺃すഃ)ᆅⅬ࡛ᚓࡽࢀࡓヨᩱࡢ V ࠾ࡼࡧ Zn ࡢ EF ࢆᣲࡆࡓࠋMPGA ࡟ࡼࡿ 1 ᫬㛫 ᐃࡣㄗᕪࡀ኱ࡁࡃ༑ศ࡞⢭ᗘࡀᚓࡽࢀࡎᮏヨᩱࡢ ᐃ᫬㛫࡜ࡋ࡚᫂ࡽ࠿࡟୙㐺࡛࠶ࡾࠊ ᐃ᫬ࡢࢭࢵࢺ࢔ࢵࣉ࡛ࡣ࠾࠾ࡼࡑ 3 ᫬㛫⛬ᗘࡢ ᐃ᫬㛫ࡀᚲせ࡛࠶ࡿࡇ࡜
ࡀศ࠿ࡿࠋࡲࡓ Zn ࡣ MPGA ᐃ࡛㠀ᖖ࡟ឤᗘࡀᝏ࠸࡜ሗ࿌ࡉࢀ࡚࠸ࡿ 1 ࡀࠊ ᐃ᫬㛫࡜࡜ࡶ࡟ㄗᕪࡀᨵၿࡉࢀࡿഴྥࡀぢࡽࢀࠊᐊᇽヨᩱ࡛ࡣ 3 ᫬㛫௨ୖࡢ ᐃ࡟ࡼࡗ࡚ࠊINAA ࡢ⤖ᯝ࡜ㄪ࿴ⓗ࡟࡞ࡿࡇ࡜ࡀ᫂ࡽ࠿࡟࡞ࡗࡓࠋࢲࢫࢺ୰ࡢ V ࠾ࡼࡧ Zn ࡣࡑࢀࡒࢀ▼Ἔ⇞ᩱ⇞↝࡟⏤᮶ࡍࡿࡀࠊ
Zn ࡣᐊᇽ࡛≉࡟㧗࠸್(40 ⛬ᗘ)ࢆ♧ࡋࠊ෤ᮇ࡟࠾࠸࡚ࡢேⅭ㉳※≀㉁ࡢ㈇Ⲵࡀ኱ࡁ࠸ࡇ࡜ࡀ♧၀ࡉࢀࡿࠋV ࡶྠᵝࡢⓎ⏕※࡛࠶ࡿ࡜᥎ᐃࡉࢀࡿࡀࠊ᥹Ⓨᚋ࡟จ⦰ࡋᚤᑡ⢏Ꮚ໬ࡍࡿࡇ࡜࡛Ỉ⁐ᛶࡀ㧗࠸≉ᚩࡀ࠶ࡾࠊࡇࢀࡀ EF<1 ࡟࡞ࡿ⌮⏤࡜⪃࠼ࡽࢀࡿࠋᮏ◊✲࡛⏝࠸ࡓ⢒኱⢏Ꮚࡣ኱Ẽ࡟ᨺ
ฟᚋ㏿ࡸ࠿࡟஝ᛶỿ╔࡟ࡼࡗ࡚኱Ẽ୰࠿ࡽ㝖ཤࡉࢀࡿࡓࡵࠊⓎ⏕※࠿ࡽࡢ⛣ື㊥㞳ࡣ᭱኱࡛ࡶᩘ
10km ࡜ࡉࢀࡿ 2ࠋ᥇ྲྀࡋࡓᐊᇽ௜㏆࡛ࡣ㐨㊰࠿ࡽࡢᕳࡁୖࡆࢲࢫࢺ࠾ࡼࡧ㝖㞷㌴࡟ࡼࡿࢹ࢕࣮ࢮ
ࣝ᤼↮࡟ࡼࡿởᰁࡀ┠ど࡛ࡁࡓࡶࡢࡢࠊ୸ᒣࡣ࿘㎶࡟ࡣ᫂☜࡞ேⅭ㉳※ࡢ౪⤥※ࡣぢ࠶ࡓࡽ࡞࠿
ࡗࡓࡇ࡜ࡶ EF ࡜ㄪ࿴ⓗ࡛࠶ࡿࠋࡲࡓ XAFS ἲ࡟ࡼࡾࢲࢫࢺ࡟ྵࡲࢀࡿ◲໬≀࠾ࡼࡧ◲㓟ሷࡢศ㞳ࢆ⾜࠸ࠊ⯆࿡῝࠸▱ぢࡀᚓࡽࢀࡓࡢ࡛ేࡏ࡚ሗ࿌ࡍࡿࠋ
[ཧ⪃ᩥ⊩]1) ᮌᮧࠊ኱ᓥࠊ㕲࡜㗰ࠊ90(12), 1004 (2004)
2) Wilson W.E., Suh H.H. J. Air & Waste Manage. Assoc. 47, 1238 (1997)
Table. Enrichment factors (EF) measured by MPGA and INAA at sampling points. The values inparentheses indicate errors which arise in each measurement
EF (n=3)Z
Stations
MPGA
INAA
3600s
7200s
10800s14400s18000sMaruyama 7.50(0.7) 2.62(1.0)
3.52(0.8)
3.35(1.8)
3.78(0.8)
3.15(1.0)
Zn 65,67
Murodo41.4(4.0)
n.d(-)
74.8(68) 39.6(21.3) 41.3(21.0) 35.3(20.7)
Maruyama 0.20(0.1) 0.08(0.0) 0.148(0.0) 0.142(0.0) 0.145(0.0) 0.141(0.0)
V52
Murodo1.80(0.2)
n.d(-)
2.83(1.0)
1.46(0.3)
1.58(0.3)
1.26(0.3)
Estimation of the anthropogenic matter ratio of dust particles trapped in snow core
SHOZUGAWA, K., MATSUO, M., OSHIMA, M., TOH, Y., KIMURA, A., KOIZUMI, M.
− 110 −

3A04

ᄙ㊀හ⊒ࠟࡦࡑ✢ಽᨆᴺߩቝቮ࿾⃿ൻቇ⊛⹜ᢱ߳ߩㆡ↪㚂ㇺᄢ㒮ℂᎿ 1㧘ේሶജᯏ᭴ 2 ٤ᷰㇱ⦟ 1㧘ᄢᶆᵏ༹ 1㧘ᶏ⠧ේల 1㧘ᄢፉ⌀Ẵ 2㧘⮮ᥰテ 2㧘ᧁ᧛ᢕ 2㧘ዊᴰశ↢ 2㧘ฎ㜞๺⑓ 2㧘᧛਄ᐘᒄ 2‫ޤߦ߼ߓߪޣ‬හ⊒ࠟࡦࡑ✢ಽᨆ㧔PGA㧕ߪ㜞ᗵᐲߥ㕖⎕უᄙర⚛หᤨቯ㊂ᴺߢ޽ࠆ߇㧘ฦర⚛߆ࠄ᡼಴ߐࠇࠆහ⊒ࠟࡦࡑ✢ߩᢙ߇ᄙ޿ߚ߼㧘᡼಴ߔࠆࠟࡦࡑ✢ᒝᐲ߇ዊߐ޿ᓸ㊂ర⚛ߪਥⷐర⚛ߩࠟࡦࡑ✢ߩᅹኂߦࠃࠅᬌ಴߇࿎㔍ߦߥࠆߎߣ߇ᄙ޿‫ޕ‬ᄙ㊀ࠟࡦࡑ✢ᬌ಴ᴺࠍ೑↪
ߒߚ PGA ߢ޽ࠆᄙ㊀හ⊒ࠟࡦࡑ✢ಽᨆ㧔MPGA㧕ߢߪࠞࠬࠤ࡯࠼හ⊒ࠟࡦࡑ✢ߩหᤨ⸘ᢙߦ
ࠃࠅ㧘ࡇ࡯ࠢߩಽ⸃⢻߇ะ਄ߔࠆ‫ߡߞࠃޕ‬㧘MPGA ߢߪࠟࡦࡑ✢ߩ㊀⇥߇ᷫዋߔࠆߚ߼ᓥ᧪
ߩ PGA ߢ᷹ቯ࿎㔍ߥᓸ㊂ర⚛ߩቯ㊂߿ቯ㊂୯ߩ⏕ᐲะ਄߇ᦼᓙߐࠇࠆ‫ޕ‬ ᧄ⎇ⓥߢߪ MPGA ߢቝቮ࿾⃿ൻቇ⊛⹜ᢱࠍᱜ⏕ߦቯ㊂ߔࠆߚ߼ߦౣ⃻ᕈ㧘 S/N Ყ㧘⹜ᢱ㊀㊂ߥߤߦߟ޿ߡᬌ⸛ࠍⴕߞߚ‫ޕ‬‫ޣ‬ታ㛎‫ޤ‬ᾖ኿ߣ᷹ቯߪᣣᧄේሶജ⎇ⓥ㐿⊒ᯏ᭴ߩ JRR-3M ಄ਛᕈሶࡆ࡯ࡓ࡜ࠗࡦߦ⸳⟎ߐࠇ
ߚ MPGA ⵝ⟎ߢⴕߞߚ‫ޕ‬FEP ࡈࠖ࡞ࡓߦኽ౉ߒߚ⹜ᢱࠍ CO2 㔓࿐᳇ਅߢ 2×3 cm2 ߩ಄ਛᕈሶ
ߢᾖ኿ߒߥ߇ࠄ㧘ࠢࡠ࡯ࡃ࡯ဳ Ge ᬌ಴ེ 8 บߣ BGO ࠪࡦ࠴࡟࡯࠲ߢ᭴ᚑߐࠇߚᬌ಴ེࠪࠬ
࠹ࡓߢහ⊒ࠟࡦࡑ✢ࠍ᷹ቯߒߚ‫ޕ‬᷹ቯ࠺࡯࠲ߪࠗࡌࡦ࠻ߏߣߦ⸥㍳ߒ㧘᷹ቯ⚳ੌᓟ㧘sortingߦࠃࠅ 2 ᰴరࠬࡍࠢ࠻࡞ࠍ૞ߞߚ‫ޕ‬ਇᗵᤨ㑆ࠍ⵬ᱜߔࠆߚ߼ߦ 133Ba ᮡḰ✢ḮࠍᏱߦหᤨߦ᷹
ቯߒߚ‫ޕ‬‫⚿ޣ‬ᨐ‫ޤ‬ ⇣ߥࠆ sorting ᴺߢᓧࠄࠇߚࡇ࡯ࠢߩ S/N ᲧࠍᲧセߒߚ‫ޕ‬
normal ᴺߦᲧߴߡ㧘add-backߣ anticoincidence ᴺߢߪ⚂ 2 ୚ S/N Ყ߇ะ਄ߒߚ‫ޕ‬add-back ᴺߪห৻ࠢࡠ࡯ࡃ࡯ᬌ಴ེౝߩ
Ge ᬌ಴ེߢหᤨߦᬌ಴ߒߚࠟࡦࡑ✢ࠛࡀ࡞ࠡ࡯ࠍ⿷ߒ㧘1 ߟߩࠦࡦࡊ࠻ࡦᢔੂߒߥ߆ߞߚࠟ
ࡦࡑ✢ߣߒߡಣℂߔࠆ‫ߡߞࠃޕ‬㧘னߩࠗࡌࡦ࠻ࠍ฽߻น⢻ᕈߩૐ޿ anticoincidence ᴺࠍណ↪
ߔࠆߎߣߦߒߚ‫ޕ‬
 MPGA ߦㆡߒߚ⹜ᢱ㊂ࠍᬌ⸛ߔࠆߚ߼ߦ㊀ߐߩ⇣ߥࠆ JB-1a㧔9.59 mg㧘48.2 mg㧘144 mg㧕
ߣ JB-1㧔206 mg㧕ࠍᾖ኿ߒ㧘Fe㧘Ti㧘Si ߆ࠄߩࠟࡦࡑ✢ࡇ࡯ࠢߩ S/N Ყߣ⸘ᢙ₸ࠍᲧセߒߚ
㧔Fig. 1㧕‫ޕ‬S/N Ყߪ⹜ᢱ㊂Ⴧടߣ౒ߦ 150 mg ߹ߢߪჇടߒ㧘ߘߩᓟ߶߷৻ቯߣߥߞߚ‫ߚ߹ޕ‬㧘⸘ᢙ₸߽ਇᗵᤨ㑆ߩߚ߼⹜ᢱ㊂ߦᲧ଀ߖߕ㧘150 mg ࠍ⿥߃ࠆߣ⹜ᢱ㊂Ⴧടߦ⷗วߞߚ⸘ᢙ₸ߩะ਄ߪ߶ߣࠎߤ⷗ㄟ߼ߥ޿‫߼ߚߩߘޕ‬㧘150 mg㨪200 mg ⒟ᐲߩ⹜ᢱ㊂߇᷹ቯߦㆡߒߡ޿ࠆ
ߣ್ᢿߒߚ‫ޕ‬100

Fe (S/N)Ti (S/N)
Si (S/N) ਄⸥ߩᬌ⸛⚿ᨐࠃࠅ JB-1㧔206 mg㧕ࠍᲧセᮡḰ⹜ᢱߣߒߡ Allende 㓓⍹㧔233 mg㧕ߣ Gold Basin 㓓⍹

10

1

1

0.5

S/N

Co ߩࡇ࡯ࠢࠍ⏕⹺ߢ߈ߚ‫ޕ‬133Ba ߩ⸘ᢙ₸ࠍ↪޿ߡ

1.5ਇᗵᤨ㑆ߩ⵬ᱜࠍⴕ޿㧘Si㧘Fe㧘Ti ߩቯ㊂ࠍ⹜ߺߚ⸘ᢙ₸㩷(cps)

㧔153 mg㧕ࠍಽᨆߒߚ‫ޕ‬Si㧘Fe㧘Ti㧘K㧘Ca㧘Mn㧘Fe (cps)Ti (cps)
Si (cps)⚿ᨐ㧘Fe㧘Si ߪᢥ₂୯ߣ± 3㧑એౝߢࠃߊ৻⥌ߒ㧘Ti ߪ♽⛔⊛ߦ 15㧑⒟ૐ߆ߞߚ‫⃻ޕ‬࿷㧘߶ߣࠎߤਥ
ⷐర⚛߆ࠄߩࠟࡦࡑ✢ߒ߆⏕⹺ߒߡ޿ߥ޿߇㧘੹ᓟ㧘ᓸ㊂ర⚛ߩቯ㊂ᕈߦߟ޿ߡ߽ᬌ⸛ߔࠆ੍ቯߢ޽ࠆ‫ޕ‬

0.1

0

50

100

150

200

0
250

⹜ᢱ㊂㩷(mg)࿑1 ⹜ᢱ㊂䈫ฦర⚛䊏䊷䉪䈱S/NᲧ䈍䉋䈶⸘ᢙ₸䈫䈱㑐ଥ

Application of multiple prompt gamma ray analysis (MPGA) to geochemical and cosmochemical
samples
WATANABE, R., OURA, Y., EBIHARA, M., OSHIMA, M., TOH, Y., KIMURA, A., KOIZUMI, M.,
FURUTAKA, K., MURAKAMI, Y.
− 111 −

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230

232

238

Ìw%lb$%232( Th/ Th)-( U/ Th) v¸@76<KI
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238

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230

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8I02/pHPDM89A=$Ze4.!3"·143 Ìw%lb$3 230Th/232Th v¸& 0.91-0.95 %¯
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230

232

238

232

Fig. 1 ( Th/ Th)-( U/ Th) activity ratio diagram
for the products from Asama volcano. Solid circles
1)-4)
represent data sets for Izu-Mriana arc volcanoes .

* ]a! (230Th/232Th)-(238U/232Th) v¸@76<KI$

Ìw%lb

%FOAD& [ÂHL6E~%FOAD"&1$¤#3S¶5  %"1Ìw%H<H& [ÂHL6E~"&¤#3 U/Th 5 HPDM1¡4 %a&0.3 (238U/232Th v¸!² 1) 02/]a!3"·143h·1) T. Yokoyama, K. Kobayashi, T. Kuritani and E. Nakamura, J. Geophys. Res., 108, doi:1029/2002JB002103 (2003)
2) Y. Kurihara, M. Takahashi and J. Sato, RADIOISOTOPES, 56, 795-809 (2007)3) S. Fukuda, S. Nakai, K. Niihori, M. Tsukui, S. Nakada, T. Fujii and K. Tani, Geochem. J., 42, 461-479 (2008)4) T. Elliott, T. Plank, A. Zindler, W. White and B. Bourdon, J. Geophys. Res., 102, 14991-15019 (2003)

Activity ratio of 230Th/232Th in the products from Asama volcano, Japan
KURIHARA, Y., TAKAHASHI, M., SATO, J.
− 113 −

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֞ܲ½֏ਨ‫ܞ‬ԙ 4 )Ēସ೯৆๘ 1 ¹݈Ջౖ߼ 2 ¹హ๝૳‫ ה‬3 ¹ఝ஡आ૬ 2 ¹
ࡕ஡‫ ݉ܤ‬2 ¹ӱ৵ॎ೼ 4ñƷƠǉƳò໑ЏƓǑӥປǀ‫ר׼‬ƝǔǓຜ੻ઙƒǐƻ‫઼ڵ‬ઙ๺֞൝Ʒ¹૰‫ע‬ഒ਽Ưƶ૛ਬࣈգƳƒƌƮࢲ຤ƲЃ݉঵ൟư݂ƐǑǔƮƌǓº‫઼ڵ‬ઙ๺֞൝ƷҲ৵ƓǑӥປǀƶ ๺֞ ૛ਬ ƶЃ ݉ ໷ƶ Ø Ċ ǚ ৱǉ ¹૛ ਬࣈ գƶ Ǉ ƲǑ Ƣ¹ ѭվ ি ઙ‫ ڈ‬ƶЄ ࠮௖ Ƴշ‫ٱ‬ƟƮƌǓº‫ؼޚ‬ƯƷ¹৪ӕƙǌ‫ݔ‬а࠯ƳЃ݉ơǓ๺֞൝ƶࢲ຤঴ƔࠉஃƝǔ¹֬‫ے‬ǌƥƶЃ݉‫װ‬௫ƳշơǓ‫ףڽ‬ƔॳǉǑǔƮƌǓº‫઼ڵ‬ઙ๺֞൝ƶ֬‫ے‬঍୩ǌЃ݉঴Ƴ շƟ Ʈ Ʒ¹   ૮ ¹ ȥǫ Ȇ Ȯս ໷ ǌƥ ƶ ਭ঵ ¹ࠚ ු ߱ƶ ਭ ঵௖ Ɣ ພƌ Ǒǔ Ʈ ƕƧ º๺֞൝ƶȋȦǪƶ௾ଦǚౝϕơǓƛưƔƯƕǓ9  ư  ૮ưǚਭǇ‫ݜ‬ǗƣƧӕ৖ഓҤࡹ඲Ʒ¹໑ЏƯƶ๺֞൝ƶЃ݉௫ઙǚ‫ڸ‬௟ơǓȃȧÓǰÓưƟƮƶ๺ܑ঴Ɣඦ‫ݥ‬Ɲǔ Ʈƌ Ǔº ෭ ‫ ף ڽ‬Ư Ʒ ¹ ໙ Џ Ɠ Ǒ Ҳ ৵ ǀ ƶ ‫ ઼ ڵ‬ઙ ๺ ֞ ൝ ƶ ໙ హ ֞ ܲ ǚ ฯ Ǒ Ɠ Ƴ ơǓ Ƨ ǉ ¹໙ Џ գ ؈ Ɣ Ђ Ʋ Ǔ  Ƭ ƶ Ҳ ৵ ƶ ҟ ໙ Џ Ƴ ƒ ƙ Ǔ ‫ ઼ ڵ‬ઙ ๺ ֞ ൝ ƶ 9  ư ૮ǚ ੯ ୩ Ɵ Ƨ ‫ ڤ‬ү ǚ ඦ ‫ ݥ‬ơ Ǔ ºñࡑ‫ۊ‬òৗࡼ৵¹ࢪ࣬৵¹‫ގ‬໙৵¹ൿՇඈ‫ת‬৵¹‫࠭ה‬৵¹జҴ৵¹ֱஹ৵ƶҟ໙ЏƯ Ø  ైƶ  ‫ڧ‬ƓǑ  ‫ڧ‬ƳƓƙƮ¹Ҳ৵ഒ਽঎ǚ໙ढ़ǐǒ‫ޡ‬঎ƟƧºҲ৵঎ଇƶ‫઼ ڵ‬ໞ ࠃƷ ¹Ҳ ৵঎ Ø Š Ɠ Ǒ༫ ੶Ѹ ढ़඲ Ƴǐ ǒൟ ໐ Ɵ¹ ஽‫ ڤ‬Մੌ ƟƧ ‫ۼ‬Ƴ ൧ง ࠟ໬ưƟ Ƨº ƶ੯୩ Ʒ¹‫ࠃۍ‬໺֞ ܲোॢ‫ ףڽ‬ӬದǶȮǺÓ ư‫ݦ‬໔գ؈‫ࣗף ڽ‬ƶҦੱ֎ࡐ໷ൟ৖‫ڐ‬ǚ߹ພƟƧº੯୩ƟƧ૮Ʒ9 /  5 ưƟƮഒƟƧºǆ Ƨ ¹  ƶ ੯ ୩ Ʒ ¹ ࡐ ໷ ൟ ৖ ‫ ڐ‬Ƴ ǐǒ ݉ ƌ ¹   ૮ ư Ɵ Ʈ ഒ Ɵ Ƨ º ‫ ઼ ڵ‬ໞ ࠃƶ๺֞૛ਬս໷¹ਙଃਬս໷Ʒ‫ی‬ਬൟ৖‫ڐ‬Ƴǐǒ੯୩ƟƧºñ ‫ ڤ‬үư ׁ ཉ òҲ ৵ ‫ ઼ ڵ‬ໞࠃ ƶ ௾ ଦ Ʒ¹ հ ੯ ơǓ ై ǌ ֥ ২Ƴ ǐ ǒ Ҳ ৵ƶ ໙ ؒ ǌ໙ Џ գ؈Ƴշ༫Ɵ඄௫ơǓƛ ưƔඦ‫ݥ‬ƝǔƮƌǓºƥƶƧǉ¹Ø ‫ ڧ‬ƶ֛յƳƒƙǓઓनҲ৵Ưƶ඄௫൒ǚౝϕơǓƧǉ¹ৗࡼ৵ƳƒƌƮ  ైƶ  ‫ڧ‬ư  ‫ڧ‬¹  ైƶ  ‫ڧ‬ư  ‫ڧ‬ƶ‫ࠟ ڐ‬໬ƳƬƌƮ  ૮ư9  ૮ǚ੯୩ƟƧºƥǔƦǔƶ൲‫ج‬૮Ʒ 7 8
ư   7 8Ư Ɗ ǒ ¹ ƛ ƶ ୷ ஶ ƶ ඄ ௫ Ɣ հ ੯ Ɵ ƧȰ‫ڧ‬յƳ໙Џ෹Ƴ֬ƛǓҧౖ঴Ɣ݂ƐǑǔǓº¸෭‫ףڽ‬ƯઓनưƟƧ ¹ ƬƶҲ৵঎‫઼ڵ‬ઙ๺֞൝ƶ  ૮ Ʒ¹ Ø 8ƶೆ϶ǚ࠷ƟƧºୢ਽ࡍ‫ۍ‬ǚ໙ǔǓൿՇඈ‫ת‬৵ƶ‫઼ڵ‬ઙ๺֞൝ƶ  ైư  ైࠟ໬ƶ  ൲‫ج‬૮Ʒ 7 8ưઁƶҲ৵ƳೝǁƮୢƌºГධ¹జҴ৵ƯƷ  ૮Ɣ 8ư‫ݗ‬Ɨ¹ƥƶϱӱƶҲ৵ƯƷ Ø 8ưǃǄГ୩ƶ૮ǚ࠷ƟƧºҲ ৵঎ ‫ ઼ڵ‬ઙ ๺֞ ൝ ƶ9  ૮Ʒ  Ø 8ư  ૮ Ƴೝ ǁƮ ೝ Ԕஇ પ ƕƲ ඄௫ ǚ࠷ Ɵ Ƨ º ୢ ਽ ࡍ ‫ ۍ‬ǚ ໙ ǔ Ǔ ൿ Շ ඈ ‫ ת‬৵ Ư Ʒ ¹  7 8ư Ԍ ࡑ ‫ ۊ‬ϱ ‫ ۼ‬ƶ ೝ Ԕ இ ॠ Ɵ ƌ ๺֞ ൝ ƶ֒ ຌ Ɣ પ൉ ൟ ǚ ৱ ǉƮ ƌ Ǔ º ƥǔ ϱ ӱ ƶࡶ Ƴ ԭ ॐ ॢ໾ ஷ ǚ ๺ ơǓ ໙ Џ ƶҲ ৵ Ư
Ʒ ¹ Ø 8ưƌ Ƣǔ Ǌ‫ ۂ‬Ɠ ƙर ۜƌ ๺֞ ൝ƶ Ѓ݉ ǚ࠷ ‫ މ‬ƟƮ ƌǓ ºਙ ઑஇ Ʋ‫ܕ ٲ‬
ưƟƮ¹9  ૮ 41  ૮¹ ȝȦೝ 41  ૮ƳƷฯ໱Ʋշ‫ٱ‬ƷీǉǑǔƲƓƫƧºƛ ǔ Ǒƶ ‫ ڤ‬ү Ʒ¹ Ҳ ৵ ‫઼ ڵ‬ໞ ࠃ ƶ ๺ ֞൝ ƶ ֬ ‫ے‬Ʒ ¹ ƥ ǔ Ʀǔ ƶ Ҳ ৵ ໙Џ ƶ ௾ ଦƳ ϴ ੻ƟƮࠊ౴ƝǔƮƌǓƛưƔ݂ƐǑǔǓº23'6 .- '6-%,+&1 %-' 1.30&(1 .)  +- 0+4(0 1612(,1 31+-*  %1 % 20%&(0   !  ! "  ! $ !# 
− 114 −

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࿾ਅ᳓ਛߩ & ߩಽ㔌੩ᄢ࡮Ἱ ‫਻ޔ‬ᄢ࡮" ࠮ࡦ࠲࡯‫਻ޔ‬ᄢ࡮ᄢ㒮ℂ ‫࡮⎇✚↥ޔ‬࿾࿤ ‫ޔ‬ᾢᄢ࡮ℂ ‫ޔ‬࿾⃿⎇  ٤ᄥ↰᦮ሶ '‫ޔ‬㚍ේ଻ౖ '‫⊖ޔ‬ፉೣᐘ (‫ޔ‬੗਄ผ჻ )‫ޔ‬੗Ꮉᕀ᰷㧠‫ޔ‬᎑↰ ⚐ ‫↰┄ޔ‬ථ⷗ '‫⼱ޔ‬ญ⌀ੱ *‫ߪ &ޤߦ߼ߓߪޣ‬ඨᷫᦼ '+ ᐕߩ᡼኿ᕈᩭ⒳ߢ޽ࠅ‫ޔ‬ṛ⇐ᤨ㑆߇ᢙ '+ ᐕߩࠬࠤ࡯࡞ߩ࿾
ਅ᳓ߩᐕઍ᷹ቯߦㆡ↪ߢ߈ࠆߎߣ߇ᦼᓙߢ߈ࠆ ',‫ޕ‬࿾ਅ᳓ਛߩ  ห૏૕ߪᄢ᳇↱᧪ߢ޽ࠆ߇‫ޔ‬⃻࿷‫ޔ‬ᄢ᳇ਛߩ  Ớᐲߪ ' -./) ߢ޽ࠆߩߢ‫ޔ‬ᄢ᳇ߣᐔⴧߩ࿾ਅ᳓ਛߩ  ߩỚᐲߪᭂૐỚᐲߢ޽ࠆ‫ߪ ޕ‬ᶧ૕ࠪࡦ࠴࡟࡯࡚ࠪࡦࠞ࠙ࡦ࠲࡯ 01 ߢ᷹ቯߢ߈ࠆ߇‫ࠍ ޔ‬ᬌ಴ߔࠆߚ߼ߦߪ‫'ޔ‬+2 0 ࠝ࡯࠳࡯ߩᄢ㊂ߩ⹜ᢱ᳓߆ࠄ  ห૏૕ࠍಽ㔌࡮᝝㓸ߔࠆᔅⷐ߇޽ࠆ‫ޕ‬࿾ਅ᳓ਛߩ  ߩಽ㔌ߪ⹜ᢱ᳓ࠍടᾲߒߡṁሽ  ࠍ    ߔࠆᚻᴺ (,ߥߤ߇޽ࠆ߇‫ޔ‬
ᄢ㊂ߩ⹜ᢱ᳓ࠍࡈࠖ࡯࡞࠼ߢಽ㔌ߔࠆᚻᴺߣߒߡߪ࿎㔍ߢ޽ࠆ‫ޕ‬ㄭᐕ‫ޔ‬3$   ),ߪ‫ޔ‬࿾ਅ᳓ਛߩ  ߩಽ㔌ߦਛⓨ♻⤑ࠍ೑↪ߒߚᚻᴺߩᬌ⸛ࠍⴕߞߡ޿ࠆ߇‫ߩߎޔ‬ᚻᴺߪࡈࠖ࡯࡞࠼
ߢᄢ㊂ߩ⹜ᢱ᳓߆ࠄṁሽࠟࠬߩߺࠍಽ㔌ߢ߈ࠆߩߢ‫ޔ‬ᓥ᧪ߩಽ㔌ᚻᴺߣᲧセߒߡࡈࠖ࡯࡞࠼
ߦㆡߒߡ޿ࠆߣ⠨߃ࠄࠇࠆ‫ߩߎޔߒ߆ߒޕ‬ᚻᴺߦࠃࠆ  ߩಽ㔌ല₸ߪ 4+㧑એਅߢ޽ࠅ‫ߐޔ‬ࠄߥࠆಽ㔌ല₸ߩᡷ⦟߇ᦸ߹ࠇߡ޿ࠆ‫╩ޕ‬⠪ࠄߪ‫ߢ࠼࡞࡯ࠖࡈޔ‬ᄢ㊂ߩ࿾ਅ᳓߆ࠄ  ࠍല₸ࠃߊಽ㔌࡮᝝㓸ߔࠆߚ߼ߦ‫ޔ‬ਛⓨ♻⤑ࠍ஻߃ઃߌߚ  ᛽಴࡜ࠗࡦࠍ૞ᚑߒ‫ޔ‬ಽ㔌ᚻᴺߩᬌ
⸛ࠍⴕߞߚ‫ޕ‬‫⹜࡯ࠨ࡯࡟࠻ ޣ‬㛎‫⹜ޤ‬ᢱ᳓ਛ䈱 㪢㫉 䈱ಽ㔌䈲䇮᳓↪䊐䉞䊦䉺䊷䇮ਛⓨ♻⣕᳇䊝䉳䊠䊷䊦䇮⌀ⓨ䊘䊮䊒䇮䉧䉴䊗䊮䊔䉕䈫䉍䈧䈔䈢䉅䈱䉕↪䈇䈢䇯᛽಴䊤䉟䊮䈲ో䈩 㪪㪬㪪 ⵾䈪䈅䉎䇯᛽಴ⵝ⟎䈱⹦⚦䈫ᕈ⢻․ᕈ╬䈲   2, 䈮⸥タ䈚䈩䈅䉎䇯 ࠻࡟࡯ࠨ࡯⹜㛎↪ߩ⹜ᢱ᳓ߪ‫ޔ‬㜞⚐ᐲ  ࠟࠬࠍ᳓㆏᳓߳ᷝടߐߖߚ߽ߩࠍ↪޿ߚ‫ࠍ ޕ‬ᷙวߐߖߚ⹜ᢱ᳓ࠍ  ᛽಴ⵝ⟎߳ㅢ᳓ߐߖ‫ޔ‬᛽಴ⵝ⟎߳ㅢߔ೨ᓟߩ⹜ᢱ᳓ࠍណขߒߚ‫⹜ޕ‬ᢱ᳓ਛߩ  ߩಽ㔌ല₸ߪ‫ ޔ‬᛽಴ⵝ⟎ߢࠟࠬࠍಽ㔌ߔࠆ೨ᓟߩ᳓ਛߩ  Ớᐲࠍᜰᮡߣߒߚ‫ ޕ‬᛽಴ⵝ⟎ߩಽ㔌ᕈ⢻ߩᬌ⸛ࠍⴕߞߚߣߎࠈ‫ޔ‬(20/ ߩಽ㔌ㅦᐲߢ 66㧑ߩ  ࠍ᳓ਛ߆ࠄಽ㔌ߔࠆߎߣ߇น⢻ߢ޽ߞߚ‫ޕ‬‫ߩ߳ࠢ࡯ࡢ࠼࡞࡯ࠖࡈޣ‬ᔕ↪‫ߩߎޤ‬᛽಴ⵝ⟎ࠍ↪޿ߡ‫ᧄޔ‬㇌ߩ ) ߟߩ࿾ਅ᳓߆ࠄ  ߩಽ㔌࡮᝝㓸ࠍⴕߞߚ‫ޕ‬᝝㓸ߒߚ  ࠍಽ㔌࡮♖⵾ߒ‫ߩ ޔ‬᡼኿⢻ᒝᐲߣ  ㊂ࠍฦ‫ޘ‬01 ߣ 81 ߢ᷹ቯࠍⴕߞߚ㧔01 ߦࠃࠆ  ߩ᷹ቯߩ⹦⚦ߪ    㧕ߦ⸥ㅀ߇޽ࠆ㧕‫ߩߎޕ‬ಽ㔌ᚻᴺࠍ↪

޿ߡࡈࠖ࡯࡞࠼ߦߡ‫'ޔ‬+20 ࠝ࡯࠳࡯ߩ࿾ਅ᳓߆ࠄല₸ࠃߊ  ߩ᛽಴ࠍⴕ߁ߎߣ߇น⢻ߢ޽ߞߚ‫ޕ‬‫ޣ‬ෳ⠨ᢥ₂‫ޤ‬', -     9;  ;   '2&)2 5(++',(,  #      9;    '46 5'642,

), 2TQDUV 3 1                  9;         :    5(++4,

2,      9;  ; 5 ,,       7  ; 5$,       
          ! "  #  $    %
− 115 −

ⅣႺ⹜ᢱਛߩᭂᓸ㊂࠙࡜ࡦ‫ޔࡓ࠙࡝࠻ޔ‬㋦߅ࠃ߮࡜ࡦ࠲ࡁࠗ࠼ߩ

3A09ㅙᰴࠗࠝࡦ੤឵ಽ㔌࡮ಽᨆේሶജᯏ᭴ ٤ችᧄ࡙࠲ࠞ‫ޔ‬቟↰ஜ৻㇢‫ޔ‬㑆ᨩᱜ᣿‫⾆᧛ᧁޔ‬ᶏ

Recovery / %‫ޤߦ߼ߓߪޣ‬U߿Th‫ޔ‬Pb‫ߩ࠼ࠗࡁ࠲ࡦ࡜ޔ‬ర⚛ሽ࿷ᐲ߿ห૏૕⚵ᚑߪጤ⍹߿㓓⍹㋶‛‫ޔ‬ᄢ᳇ᶋㆆߓࠎ╬ߩⅣႺ⹜ᢱߩᚑ࿃߿⿠Ḯߥߤࠍ⺞ߴࠆࡊࡠ࡯ࡉߦߥࠅᓧࠆ‫ࡉࠨޕ‬ng࡟ࡌ࡞㊂ߩߎࠇࠄߩర⚛ࠍICP-MSߢᱜ⏕ߦቯ㊂࡮ห૏૕Ყಽᨆߔࠆߚ߼ߦߪ◲ଢߥൻቇಽ㔌ᴺࠍ⏕┙ߔࠆߎߣ߇ᔅⷐߢ޽ࠆ‫ޕ‬㜞⚐ᐲ޽ࠆ޿ߪ↢ᚑ߇ኈᤃߥ⹜⮎߆ࠄᚑࠆṁ㔌ᶧߦࠃࠆන⚐ߥൻቇಽ㔌ᴺࠍᬌ⸛ߒߡ߈ߚ⚿ᨐ‫ޔ‬㈶㉄߿ࡔ࠲ࡁ࡯࡞ࠍਥᚑಽߣߔࠆṁ㔌ᶧࠍ↪޿ࠆߎߣߢㅙᰴಽ㔌߇น⢻ߣߥߞߚ‫ޔߒ߆ߒޕ‬Thߩṁ಴߇✭ᘟߢ޽ࠆߚ߼Pbߩಽ↹ߦThߩ৻ㇱ߇ᷙ౉ߔࠆ໧㗴߇ᱷߐࠇߡ޿ߚ(1)‫੹ޕ‬࿁‫ޔ‬㈶㉄㧗Ⴎ㉄ᷙวṁᇦࠍ↪޿ࠆߎߣߢቢోߥThಽ㔌߇㆐ᚑߢ߈‫ޔ‬ⅣႺ⹜
ᢱ߳ߩᔕ↪߇น⢻ߣߥߞߚߩߢႎ๔ߔࠆ‫ޕ‬‫ޣ‬ታ㛎ᣇᴺ‫(ࡓ࡜ࠞ⵾ࡦ࡟࠴ࠛ࡝ࡐޤ‬5.5 mmI42 mm [ࠞ࡜ࡓኈⓍ 1 ml])ߦ⹣߼ߚ㒶ࠗࠝࡦ੤឵᮸⢽(ࡓࡠࡑ࠶ࠢ 1x8‫ޔ‬Cl ᒻ‫ޔ‬100-200 mesh)ࠍࠗࠝࡦ੤឵ಽ㔌ߦ↪޿ߚ‫ޕ‬ICP-MS ᩞᱜṁᶧ߆ࠄ⺞⵾ߒߚ U, Th, Pb, ࡜ࡦ࠲ࡁࠗ࠼╬ߩర⚛ࠍ฽߻⹜ᢱṁᶧ 500µl(ฦర⚛㊂ 50 ng)ࠍࠞ࡜
ࡓߦๆ⌕ߐߖߚᓟ‫ޔ‬ṁ㔌ᶧߢಽ㔌ߒߚ(ᵹㅦ㧦0.1㨪0.4 ml/min.)‫ޕ‬4 ml Ფߦ࠹ࡈࡠࡦࡆࡦߦ㓸߼ߚࠞ࡜ࡓṁ಴ᶧࠍ 2㧑⎣㉄ṁᶧ 2 ml ߦ⺞ᢛߒ‫ޔ‬ర⚛ߩṁ಴㊂ࠍ ICP-MS ߢቯ㊂ߒߚ‫ޕ‬‫⚿ޣ‬ᨐߣ⠨ኤ‫ޤ‬㈶㉄߅ࠃ߮Ⴎ㉄ߩỚᐲࠍߘࠇߙࠇ 60㨪80%‫ޔ‬0.2M㨪1M ߣᄌ߃ߚ㈶㉄㧗Ⴎ㉄ᷙวṁᇦߢಽ㔌ߒ Th ߩṁ಴᜼േࠍ⺞ߴߚ⚿ᨐ‫ޔ‬㈶㉄Ớᐲࠍૐߊߔࠆ߶ߤ‫ߡߒߘޔ‬Ⴎ㉄Ớᐲࠍ㜞ߊߔࠆ߶ߤ Th ߇ᣧߊṁ㔌ߔࠆߎߣ߇ಽ߆ߞߚ‫ߚ߹ޕ‬㈶㉄Ớᐲࠍ 60%ߦߔࠆߣ Pb ߪ Th ߣߣ߽ߦṁ಴ߒߚ‫ޕ‬Th ಽ㔌ߦᦨㆡߥṁ㔌ᶧߩ⚵ᚑߪ 70㧑㈶㉄㧗1M Ⴎ㉄‫ޔ‬ᶧ㊂ߪ 22 ml ߢ޽ߞߚ‫ ߦᦝޕ‬0.005M ߩࡈ࠶ൻ᳓⚛㉄ࠍߎߩṁ㔌ᶧߦᷝടߔࠆߣ‫ޔ‬Th ߩṁ㔌ࡇ࡯ࠢ߇㍈ߊߥࠅ Th߇ṁ಴ߒ߿ߔߊߥߞߚ‫ߪࠇߎޕ‬㓁ࠗࠝࡦߩ Th ࡈ࡞ࠝࡠ㍲૕߇ᒻᚑߐࠇࠆߎߣߦࠃࠆ߽ߩߣ⠨߃ࠄࠇࠆ‫ޕ‬U ߢ߽ห᭽ߦ 0.5M Ⴎ㉄㧗0.005M ࡈ࠶ൻ᳓⚛㉄ߢṁ㔌ߔࠆߣṁ㔌ࡇ࡯ࠢ߇㍈ߊߥࠅṁ಴ߒ߿ߔߊߥߞߚ‫ߩࠄࠇߎޕ‬ṁ㔌ᶧࠍ૶ߞߡ⋡⊛ర⚛ࠍㅙᰴಽ㔌ߒߚṁ㔌ᦛ✢ߩ଀ࠍ࿑
1 ߦ␜ߔ‫ޕ‬ಽ㔌⋡⊛ߢ޽ࠆ U, Th, Pb,࡜ࡦ࠲ࡁࠗ࠼(La, Lu ߢઍ⴫)ߩઁߦห૏૕ಽᨆߩ㓙ߦࡑ࠻࡝࠶ࠢࠬലᨐߦࠃࠆ♽⛔⊛⺋Ꮕࠍਈ߃ࠆࠕ࡞ࠞ࡝㊄ዻ(Rb ߢઍ⴫)߿ࠕ࡞ࠞ࡝࿯㘃㊄ዻ(Sr ߢઍ⴫)‫ޔ‬Fe ߦߟ޿ߡ
㽳
㽴 Pb㽵
㽶
㽷
100 㽲
߽␜ߒߚ‫ޕ‬Sr ߿ FeTh
RbUߩ৻ㇱ߇ߘࠇߙࠇ
80
Sr࡜ࡦ࠲ࡁࠗ࠼߿ U
stand for
La
60
10 h
ߩಽ↹ߦᷙ౉ߔࠆ
Lu
߇‫⊛⋡ޔ‬ర⚛ߪ㒰
40Fe
ᨴଥᢙ 100 એ਄ߢ
20ㅙᰴಽ㔌ߔࠆߎߣ
߇಴᧪ߚ‫ߩߎޕ‬ㅙ
ᰴಽ㔌ᴺࠍᮡḰጤ⍹⹜ᢱߦᔕ↪ߒߚ⚿ᨐߦߟ޿ߡ߽ႎ
๔ߔࠆ‫ޕ‬

(Fe)

0

0

20

40

(Pb)

60
80
Effluent volume / ml

(Fe)

100

120

Fig. 1: Chromatogram of Rb, Sr, La, Lu, Th, Pb, Fe and U with the mixtures of
CH3COOH, HCl and HNO3.

(1) ችᧄઁ‫ ╙ޔ‬52 ࿁᡼኿ൻቇ⸛⺰ળⷐᣦ㓸 (J.Ncul.Radiochem.Sci., suppl. 9) p.27 (2008).

Sequential ion-exchange separation and analysis of trace uranium, thorium, lead and lanthanides inenvironmental samples
MIYAMOTO, Y., YASUDA, K., MAGARA, M., KIMURA, T.
− 116 −

ᮾ㒊ኴᖹὒ (2003 ᖺ)࡟࠾ࡅࡿ Am-241 ࡢᾏỈ୰⃰ᗘศᕸ

3A10㔠ἑ኱㝔࣭⮬↛⛉Ꮫࠊ⟃Ἴ኱࣭ᛂ⏝ຍ㏿ჾࠊ㔠ἑ኱࣭⌮ᕤ ‫ۑ‬Ọᒸ ⨾ెࠊ㝮 ㈗ᘯࠊᮌୗဴ୍ࠊᶓᒣ ᫂ᙪࠊ୰す Ꮥ࠙ࡣࡌࡵ࡟ࠚ኱Ẽᅪෆ᰾ᐇ㦂㸦 ᖺ㸧࡟ࡼࡾ✀ࠎࡢேᕤᨺᑕᛶ᰾✀(᰾ศ⿣⏕ᡂ≀ࡸ㉸࢘ࣛࣥ᰾✀)ࡀ⎔ቃ୰࡟ᨺฟࡉࢀ㸪ᆅ⌫⾲㠃✚ࡢ⣙  %ࢆ༨ࡵࡿᾏὒࡀ୺࡟ởᰁࡉࢀࡓࠋ
241

Pu࠿ࡽ⏕ᡂࡋࡓ241Amࡶ᰾ᐇ㦂࡟⏤᮶ࡍࡿ⎔ቃởᰁ᰾✀࡛࠶ࡿࠋ241AmࡣȘᨺᑕయ࡛࠶ࡾ㸪ᾏ⏘≀ࢆ㏻ࡋ࡚యෆ࡬ᦤྲྀࡉࢀࡿ࡜ෆ㒊⿕ࡤࡃࡢཎᅉ࡜࡞ࡿࡢ࡛㸪ᾏὒ࡛ࡢAmྠ఩యࡢศᕸ
ࡸᣲື࡟㛵ࡍࡿ▱ぢࢆᚓ࡚࠾ࡃᚲせࡀ࠶ࡿࠋࡲࡓᾏὒ࡟࠾࠸࡚ᨺᑕᛶ᰾✀ࡣᾏὒ⎔ቃ୰࡛㉳ࡇࡿ⏕≀ᆅ⌫໬Ꮫⓗ㐣⛬࡟⤌ࡳ㎸ࡲࢀ㸪Amࡣ⢏Ꮚぶ࿴ⓗ㸪Puࡣ⁐Ꮡⓗ࡛࠶ࡿ࡜ࡉࢀ㸪Amࡢ
᪉ࡀᾏᗏ᪉ྥ࡬㏿ࡸ࠿࡟㝖ཤࡉࢀࡿ࡜⪃࠼ࡽࢀࡿࠋࡋ࠿ࡋࡲࡔ㸪ᾏὒࡢࢹ࣮ࢱࡣ༑ศ࡛ࡣ࡞
࠸ࡓࡵ㸪ᵝࠎ࡞ᾏᇦ࡛ᾏỈ࡜ᾏᗏሁ✚≀ࡢAmࡢ◊✲ࡀ⾜ࢃࢀ࡚࠸ࡿࠋ
࠙ᐇ㦂ࠚᮾ኱ᾏὒ◊ⓑ㬅୸KH-㸦HY㸧 ◊✲⯟ᾏࡢ㝿࡟㸪ᮾ㒊ኴᖹὒ㸦Ⅼ㸧࡛῝ᗘู

ᾏỈࡀ⣙ Lࡎࡘ᥇ྲྀࡉࢀࡓ㸦Fig.㸯㸧ࠋᾏỈ
ヨᩱࡣ⯪ୖ࡛ሷ㓟㓟ᛶ࡜ࡋ㸪᪤▱㔞ࡢ཰⋡ࢺ࣮ࣞࢧ࡜Fe3+ᢸయࡀῧຍࡉࢀ㕲ඹỿࡀ⾜ࢃࢀࡓࠋ㝣ୖ࡟ᣢࡕᖐࡽࢀࡓỈ㓟໬≀ỿẊ࠿ࡽ㸪㝜࢖࢜ࣥ஺᥮ᶞ⬡࣒࢝ࣛἲ࡟ࡼࡗ࡚Amࢆ⢒ศ㞳ࡋ㸪ࡉࡽ࡟⢭〇ࡢᚋ㸪㟁╔⥺※ࢆㄪ〇ࡋ࡚Ș⥺ࢫ࣌ࢡࢺ࣓ࣟࢺࣜ࡟ࡼࡾ241Amࢆᐃ㔞ࡋࡓࠋ
Ⅼ࡟࠾ࡅࡿ239,240Pu㸪

241Amࡢ῝ᗘศᕸ㸪ཬࡧ241Am/239,240Puᨺᑕ⬟ẚࡢ୍౛ࢆFig.㸰࡟♧ࡍࠋࡇࡢ

0241

Am ࡢ῝ᗘศᕸࣃࢱ࣮ࣥࡣ࠾࠾ࡼࡑ

1000

239,240

Pu࡟ఝ࡚࠸ࡿࠋࡋ࠿ࡋ㸪ᾏᗏ௜㏆࡛

Am/

239,240

3000

Puᨺᑕ⬟ẚ࡟࠾࠸࡚㸪⾲ᒙ࡜ᾏᗏ௜㏆࡛ప࠸್ࡀほࡉࢀࡓࠋࡇࢀࡣ㸪⾲ᒙ࠿ࡽ୰ᒙ࡟࠿ࡅ࡚Amࡢỿ㝆ࡀ㏿ࡸ࠿࡛࠶ࡿࡇ࡜㸪ࡲࡓᾏᗏ௜㏆࡛ࡶAm࡜
Puࡢỿ㝆ᣲື࡟ᕪࡀ࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋ

20

40

1000

(a)

Fig. 2

1

Pu activity ratio
2
3

(b)

2000

3000

4000

5000

239,24002000

Depth /mࡽࢀࡿࡢ࡟ᑐࡋ㸪Am࡛ࡣ㏫࡛࠶ࡿࠋ
241

Am /
0

0

Ⅼ࡛ࡢ

ࡣPuࡢ෌⁐ゎ࡜ࡳࡽࢀࡿ⃰ᗘࡢቑຍࡀぢ241

1

Activity / ȝBqL䈴

Depth /m࠙⤖ᯝ࡜⪃ᐹࠚྠ

Fig. 1 Location of sampling stations

4000
Am-241
Pu-239,240

Global fallout
5000(a) Depth profiles of 241Am and 239,240Pu and(b) 241Am / 239,240Pu activity ratio at HY-3 station

Distribution of 241Am concentration in water column of eastern Pacific in 2003.
NAGAOKA, M., SUMI, T., KINOSHITA, N., YOKOYAMA, A., NAKANISHI, T.
− 117 −

3A11

223

Ra ࠍ෼₸࠻࡟࡯ࠨߦ↪޿ߚ 226Ra ߩᶧ૕ࠪࡦ࠴࡟࡯࡚ࠪࡦ᷹ቯ

(㊄ᴛᄢ㒮⥄ὼ 1㧘㊄ᴛᄢℂᎿ 2)٤਄᧖ᱜ᮸ 1㧘ᣣධቬ৻㇢ 1㧘ᮮጊ᣿ᒾ 2㧘ਛ⷏ ቁ 2‫ ޤߦ߼ߓߪޣ‬㘶ᢱ᳓߿࿾ਅ᳓ߦ฽߹ࠇࠆ 226Ra ߪᭂᓸ㊂ߢ޽ࠅ㧘ǫ✢ࠬࡍࠢ࠻ࡠࡔ࠻࡝
࡯ߦࠃࠆಽᨆߢߪ 100 L ⒟ᐲߩ⹜ᢱ߆ࠄߩ Ra Ớ㓸߇ᔅⷐߢ㧘BaSO4 ౒ᴉᴺ߇ᐢߊⴕࠊࠇߡ
޿ࠆ‫ޕ‬ᶧ૕ࠪࡦ࠴࡟࡯࡚ࠪࡦ㧔ᶧࠪࡦ㧕ᴺ߿ǩ✢ࠬࡍࠢ࠻ࡠࡔ࠻࡝࡯ߦࠃࠆಽᨆߢߪ࿁෼
₸᷹ቯ↪ߩ Ba ߩ૶↪㊂ߦ೙⚂߇޽ࠆ‫ߩࡓ࠙ࠫ࡜ޕ‬࿁෼₸⵬ᱜ↪࠻࡟࡯ࠨߦੱᎿ᡼኿ᕈᩭ
⒳ 133Ba㧔T1/2=10.5y㧕ࠍ૶↪ߔࠆ႐ว߽޽ࠆ߇㧘ǫ✢᷹ቯ߿ᶧࠪࡦ᷹ቯߢߪ૶߃ߥ޿‫৻ޕ‬
ᣇ㧘223Ra㧔T1/2=11.4d㧕ߪࡑࠗ࠽࡯ߥᄤὼ᡼኿ᕈᩭ⒳ߢ޽ࠅ㧘154keV ߣ 269keV ߩǫ✢߇ਥⷐߥǫ✢ߢ޽ࠆ‫ ߚ߹ޕ‬223Ra ߦߪ㐳ኼ๮ߩሶቊᩭ⒳ߪሽ࿷ߖߕ㧘ǫ✢᷹ቯߢ࿁෼₸ࠍ᳞߼ߚᓟ㧘᡼⟎ߔࠇ߫ᶖṌߔࠆ‫ߢߎߘޕ‬㧘223Ra ࠍ࡜ࠫ࠙ࡓߩỚ㓸෸߮ᶧࠪࡦ᷹ቯߩ࠻࡟࡯ࠨߦ
↪޿ߡଏ⹜㊂ߩ೥ᷫࠍ࿑ࠆߎߣࠍ⠨߃ߚ‫ ߦࠄߐޕ‬Ra Ớ㓸ᴺߦߟ޿ߡߪ㧘Ba2+ᜂ૕ࠍ૶↪ߒ
ߥ޿ᣇᴺߣߒߡ᳓㉄ࠕࡄ࠲ࠗ࠻[HAp㧦Ca10(PO4)6(OH)2]౒ᴉᴺߩㆡ↪ࠍᬌ⸛ߒߚ‫ߚ߹ޕ‬㧘ᶧࠪࡦ᷹ቯߢߪ᷹ቯኈེਛߩ࡜࠼ࡦߩ⒖േ㧘ǫ✢ߩ⸘ᢙ߳ߩᓇ㗀ߦߟ޿ߡᬌ⸛ߒߚ‫ޕ‬‫ޣ‬ታ 㛎‫ ޤ‬Ԙ 223Ra ࠻࡟࡯ࠨߩ⺞⵾㧦227Ac㧔T1/2=21.8y㧕ࠍᷝ⌕ߒߚ㓁ࠗࠝࡦ੤឵᮸⢽ࠞ࡜ࡓ߆ࠄ㧘3M HNO3 ߢṁ㔌ߒߚ‫ޕ‬ԙ ᳓㉄ࠕࡄ࠲ࠗ࠻౒ᴉᴺߦࠃࠆ Ra Ớ㓸ߩᬌ⸛㧦Ra ߩỚ㓸ߦ߅޿ߡ㧘Ca2+ᜂ૕㊂ߣỚ㓸₸ߩ㑐ଥࠍ⺞ߴߚ‫⹜ޕ‬ᢱ᳓ߦ 223Ra (10 Bq)㧘Ca2+ᜂ૕㧔10㨪70 mg/L ߩ▸࿐ߢ㧢Ბ㓏㧕෸߮࡝ࡦ㉄ࠕࡦࡕ࠾࠙ࡓࠍട߃㧘ࠕࡦࡕ࠾ࠕ᳓ߢ pH ࠍ 9 ߣߒߡ᳓㉄ࠕࡄ࠲ࠗ࠻ࠍ↢ᚑߐߖߚ‫ޕ‬ᴉᲚࠍ㆙ᔃಽ㔌ߒ㧘⎣㉄ߢṁ⸃ߒߚᓟ㧘᷹ቯኈེߦ⒖ߒߡǫ✢᷹ቯࠍⴕߞߚ‫ޕ‬Ԛ ♖⵾ಽ㔌ߣ᷹ቯ㧦ࠞ࡜ࡓߦ㓁ࠗࠝࡦ੤឵᮸⢽ 1㨓ࠍ⹣߼ߡࠗࠝࡦ੤឵᮸⢽ࠞ࡜ࡓࠍ⺞⵾ߒ㧘ԙߢᓧߚ⎣㉄ṁᶧߦࠢࠛࡦ㉄ࠕࡦࡕ࠾࠙ࡓࠍᷝടߒ㧘pH ࠍ 3 ߦ⺞ᢛߒߚᓟ㧘ࠗࠝࡦ੤឵᮸⢽ࠞ࡜ࡓߦᵹߒߚ‫ޕ‬ㅢᶧᓟߩࠗࠝࡦ੤឵᮸⢽ࠍ 25 mL ࡃࠗࠕ࡞ߦ⒖ߒ㧘࠻࡞ࠛࡦࠪ
ࡦ࠴࡟࡯࠲ 10 mL ࠍട߃ߡኒᩖࠍߒߚ‫ߦߜ⋥ޕ‬ǫ✢ࠍ᷹ቯߒ㧘223Ra ⸘ᢙ₸߆ࠄ Ra ߩ࿁෼₸ࠍ᳞߼ߚ‫ޕ‬1 ࡩ᦬ᓟ㧘ᶧࠪࡦᴺߢ 226Ra ࠍ᷹ቯߒߚ‫ߩߎޕ‬ᶧࠪࡦᴺߢߪ㧘223Ra ෸߮ሶቊᩭ⒳߇᡼಴ߔࠆǫ✢ߩ⸘ᢙ₸ነਈࠍ⷗Ⓧ߽ߞߚ‫ ߚ߹ޕ‬226Ra 0.3Bq ࠍ฽߻ 3 ⹜ᢱ㧔᳓ṁᶧ㧘㓁ࠗࠝࡦ੤឵᮸⢽㧘⎫㉄ࡃ࡝࠙ࡓ㧕ࠍ᳓ጀߦ౉ࠇ㧘ࠪࡦ࠴࡟࡯࠲ 10 mL ࠍട߃ߡ߆ࠄᤨ㑆ࠍㅊߞߡࠪࡦ࠴࡟࡯࡚ࠪࡦ᷹ቯࠍⴕ޿㧘⸘ᢙ₸ߩᄌൻ߆ࠄ࡜࠼ࡦߩ⒖േࠍⷰኤߒߚ‫ޕ‬‫⚿ޣ‬ᨐߣ⠨ኤ‫ ޤ‬㧝㧚᳓㉄ࠕࡄ࠲ࠗ࠻౒ᴉᴺߢ Ca2+ᜂ૕ 30 mg/L એ਄ߢ࡜ࠫ࠙ࡓߩ 95㧑એ਄߇࿁෼ߢ߈ߚ‫ޕ‬㧞㧚㓁ࠗࠝࡦ੤឵᮸⢽ࠞ࡜ࡓߦࠃࠆ♖⵾ߦ߅޿ߡ㧘ᜂ૕ߩ Ca2+ߪࠢࠛࡦ㉄ᷝടߦࠃࠅ Ra߆ࠄಽ㔌ߐࠇߚ㧔Ca2+߇ࠞ࡜ࡓࠍㅢㆊߒ㧘Ra2+߇ࠞ࡜ࡓߦ᝝㓸ߐࠇࠆ㧕‫ޕ‬㧟㧚࡜࠼ࡦ߇᷹ቯࡃࠗࠕ࡞ਛߢࠗࠝࡦ੤឵᮸⢽߆ࠄ᳓߳㧘ߐࠄߦࠪࡦ࠴࡟࡯࠲߳ߣ⒖േ
ߔࠆ㓙㧘222Rn㧔T1/2=3.8d㧕[φ 226Ra]ߣ 219Rn㧔T1/2=4s㧕[φ 223Ra]ߩኼ๮ߩᏅߦࠃࠅ 222Rn
ߣ 219Rn ߇ಽ㔌ߐࠇ㧘222Rn ߩߺ߇⸘ᢙߐࠇࠆߎߣࠍ⏕⹺ߒߚ‫ޕ‬㧠㧚ᶧ૕ࠪࡦ࠴࡟࡯࡚ࠪࡦࠬࡍࠢ࠻࡞ߩ 223Ra ߦ⿠࿃ߔࠆǫ✢ߩነਈߪૐࠛࡀ࡞ࠡ࡯ࡄ
࡞ࠬߩಾᝥߡߢ೥ᷫߐࠇࠆ‫ޕ‬એ਄ߦࠃࠅ㧘226Ra ߩቯ㊂ߦ 223Ra ࠻࡟࡯ࠨ߇᦭ലߢ޽ࠆߎߣ߇ಽ߆ߞߚ‫ޕ‬
Determination of 226Ra by liquid scintillation spectrometry using 223Ra as yield tracer
UESUGI, M., HINAMI, S., YOKOYAMA, A., NAKANISHI, T.
− 118 −3A12

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HIROSE, K., KIKAWADA, K., DOI, T., SU, C.-C., YAMAMOYO, M.
− 120 −

研究発表要旨
9 月 30 日（水）3B01 〜 3B13：口頭発表

B 会場（会議室 2）

3B01

㧗㏿୰ᛶᏊࢆ⏝࠸ࡓ་⒪⏝ 5, ࡢ〇㐀◊✲ཎᏊຊᶵᵓ ‫ึۑ‬ᕝ㞝୍ࠊᶫᮏ㞞ྐࠊỌ஭Ὀᶞࠊ㔠ᨻᾈࠊ℩ᕝ㯞㔛Ꮚࠊཎ⏣⚽㑻ࠊ௒㔝ຊࠊⴠྜㅬኴ㑻ࠊ㧗಴⪔♸ࠊᒾᮏಙஅࠊᒾᮏಟ

࠙ࡣࡌࡵ࡟ࠚ 99Mo/99mTc ࢪ࢙ࢿ࣮ࣞࢱ࣮ࢆึࡵ࡜ࡋ࡚ᨺᑕᛶྠ఩యࡣᖜᗈࡃ་⒪ࡢศ㔝࡛฼⏝ࡉࢀ࡚࠸ࡿࡀࠊከࡃࡢ RI ࡣ㍺ධ࡟㢗ࡗ࡚࠸ࡿࡢࡀ⌧≧࡛࠶ࡿࠋ౛࠼ࡤ 99Mo/99mTc ࢪ࢙ࢿ࣮ࣞࢱ࣮ࡣᾏእࡢཎᏊ⅔࡛㧗⃰⦰࢘ࣛࣥࢆ↷ᑕࡋࡑࡢ᰾ศ⿣⏕ᡂ≀ࡼࡾ 99Mo ࢆศ㞳ࡋ࡚〇㐀ࡋ࡚࠸ࡿࠋࡋ࠿ࡋࠊ〇㐀࡟⏝࠸ࡽࢀ࡚࠸ࡿཎᏊ⅔ࡢ⪁ᮙ໬ࡸ㧗⃰⦰࢘ࣛࣥࡢ฼⏝➼࡟ၥ㢟ࡀ
㸦1㸧࠶ࡾࠊᑗ᮶ⓗ࡟Ᏻᐃ࡞౪⤥ࡀ␲ၥどࡉࢀ࡚࠸ࡿࠋ
ࡑࡇ࡛᪂ࡓ࡞་⒪⏝ 5, ࡢ〇㐀ἲࡢ㛤Ⓨࡀᮇᚅࡉࢀ࡚࠾ࡾࠊ⌧ᅾཎᏊ⅔୰ᛶᏊࢆ⏝࠸ࡓ
98
Mo(nth,J)99Mo ཯ᛂ࡟ࡼࡿ〇㐀◊✲ࡶ㐍ࡵࡽࢀ࡚࠸
ࡿࠋ㸦2㸧Ⓨ⾲⪅ࡽࡣ 99Mo/99mTc ࢪ࢙ࢿ࣮ࣞࢱ࣮ࡢ〇㐀࡟࠾ࡅࡿຍ㏿ჾ୰ᛶᏊࢆ⏝࠸ࡓ 100Mo(n,n)99Mo ཯ᛂࡢ᭷⏝ᛶ࡟ࡘ࠸࡚ᣦ᦬ࡋ࡚ࡁࡓࠋ㸦3㸧ᚑ᮶ࡢ◊✲࡟ᇶ࡙ࡁୖグࡢ㸰ࡘࡢ཯ᛂ᩿㠃✚ࢆẚ㍑ࡍࡿ࡜
98
Reimer-KRI(2005)
Mo(nth,J)99Mo ཯ ᛂ ࡀ 140mb ࡛ ࠶ ࡿ ࡢ ࡟ ᑐ ࡋ ࡚
Reimer-IRMM(2005)
100
99
Mo(n,n) Mo ཯ᛂ࡛ࡣ 10MeV ௨ୖࡢ୰ᛶᏊ࡟ᑐࡋ
࡚ 1~1.5b ࡯࡝ࡢ㧗࠸᩿㠃✚࡟࡞ࡗ࡚࠸ࡿࠋ㸦ᅗ-1㸧
ᅗ-1 㧗㏿୰ᛶᏊ࡟ࡼࡿ㸦n,2n㸧཯ᛂࡢບ㉳㛵ᩘ㸦4㸧ᮏ◊✲࡛ࡣຍ㏿ჾ࡟ࡼࡾⓎ⏕ࡍࡿ㧗㏿୰ᛶᏊࢆ⏝࠸ࡿࡇ࡜࡟ࡼࡾ᪂ࡋ࠸ᨺᑕᛶྠ఩యࡢ〇㐀᪉ἲࢆ㛤Ⓨࡍࡿࡇ࡜ࢆ┠ⓗ࡜ࡋ㧗㏿୰ᛶᏊ࡟ࡼࡿ་⒪⏝5,〇㐀ࡢ᭷ពᛶ࡟ࡘ࠸࡚ᐇ㦂ⓗ࡟☜࠿ࡵࡿࡶࡢ࡛࠶ࡿࠋ
࠙ᐇ㦂ࠚ ᐇ㦂ࡣཎᏊຊᶵᵓࡢ᰾⼥ྜ୰ᛶᏊᕤᏛ⏝୰ᛶᏊ※᪋タ㸦Fusion Neutronics Source㸹FNS㸧࡟࡚⾜࠸ࠊD-T ୰ᛶᏊ᰾⼥ྜ཯ᛂ࡟ࡼࡾ⏕ᡂࡍࡿ 14MeV ࡢຍ㏿ჾ୰ᛶᏊࢆ⏝࠸ࡓࠋFNS
ࡣ 400 keV 㔜㝧Ꮚຍ㏿ჾ࡛ 0°࡜ 80°ࡢ 2 ࡘࡢࣅ࣮࣒ࣛ࢖ࣥࢆ᭷ࡍࡿࠋ0°ࣅ࣮࣒ࣛ࢖࡛ࣥࡣ 20
mA 㔜㝧Ꮚࣅ࣮࣒࡛ 41012 n/s ࡢ୰ᛶᏊࡀⓎ⏕ࡋ, 80°ࣅ࣮࣒ࣛ࢖࡛ࣥࡣ 2 mA ࡛ 21011 n/sࡢ୰ᛶᏊࢆᚓࡿࡇ࡜ࡀฟ᮶ࡿࠋᮏ◊✲࡛ࡣ 80°ࣅ࣮࣒ࣛ࢖ࣥࢆ౑࠸୰ᛶᏊ⥺※఩⨨࠿ࡽ 10cm
ࡢ㊥㞳࡟ Mo ࡸ TiࠊCs ࡞࡝ࢆࢱ࣮ࢤࢵࢺ࡜ࡋ࡚タ⨨ࡋ 6 ᫬㛫࠿ࡽ 24 ᫬㛫ࡢ㧗㏿୰ᛶᏊ↷ᑕࢆ⾜࠸ࠊ㐺ᙜ࡞෭༷ᮇ㛫ࡢᚋ Ge ༙ᑟయ᳨ฟჾ࡛࣐࢞ࣥ⥺ ᐃࢆ⾜ࡗࡓࠋࢱ࣮ࢤࢵࢺࡣࡑࢀࡒ
ࢀ Nb ࣇ࢛࢖ࣝࢆୖὶഃࠊୗὶഃ࡟タ⨨ࡋ 93Nb(n,n)92mNb ཯ᛂࡢ཯ᛂ⋡࠿ࡽ୰ᛶᏊࣇࣛࢵࢡ
ࢫࢆ⟬ฟࡋࠊᚓࡽࢀࡓ࣐࢞ࣥ⥺ᙉᗘ࠿ࡽ཯ᛂ᩿㠃✚ࢆồࡵࡓࠋ࠙ࡲ࡜ࡵࠚ 100Mo(n,n)99Mo ཯ᛂ࡟ຍ࠼࡚ࠊTi, Cs ࢆࢱ࣮ࢤࢵࢺ࡜ࡍࡿ㧗㏿୰ᛶᏊ࡜ࡢ㸦n,p㸧,
㸦n,D㸧཯ᛂࡢ཯ᛂ᩿㠃✚ࢆᚓࡿࡇ࡜ࡀฟ᮶ࡓࠋᚓࡽࢀࡓ཯ᛂ᩿㠃✚࠿ࡽᐇ㝿ࡢ⏕ᡂ㔞ࡢぢ✚ࡶࡾࢆ⾜࠸᪂ࡓ࡞་⒪⏝ RI 〇㐀ἲ࡜ࡋ࡚ྍ⬟ᛶࢆㄽࡌࡿࠋᩥ⊩1)͇ᥦゝ-ᡃࡀᅜ࡟࠾ࡅࡿᨺᑕᛶྠ఩ඖ⣲ࡢᏳᐃ౪⤥࡟ࡘ࠸࡚͇᪥ᮏᏛ⾡఍㆟ 2008 ᖺ 7 ᭶ 24 ᪥2)ᒣᯘᑦ㐨ࠊ➨ 46 ᅇ࢔࢖ࢯࢺ࣮ࣉ࣭ᨺᑕ⥺◊✲Ⓨ⾲఍ண✏㞟㸦2009 ᖺ 7 ᭶㸧3)Y. Nagai and Y. Hatsukawa, J. Phys. Soc. Jpn., 78, 033201 (2009)4)P. Reimer, et al., Phys. Rev. C71, 044617 (2005)
Production of Radioisotopes for Nuclear medicine using fast neutron reactions HATSUKAWA, Y.,
HASHIMOTO, M., NAGAI, Y., KIN, T., SEGAWA, M., HARADA, H., KONNO, C., OCHIAI, K.,
TAKAKURA, K., IWAMOTO, N., IWAMOTO, O.
− 122 −

3B02

nat

3 ᮡ⊛ࠍ↪޿ߚᏗ࿯㘃ర⚛ࡑ࡞࠴࠻࡟࡯ࠨ࡯ߩ⵾ㅧ

ℂ⎇ੳ⑼࠮٤ᳯፒ⼾㧘⠀႐ብశ㧘═᧻⦟ፏ‫ޤ⸒✜ޣ‬Ꮧ࿯㘃ర⚛㧔$㧕ߩࡑ࡞࠴࠻࡟࡯ࠨ࡯ߪ㧘ᄙᢙߩ $ ࠍห৻ታ㛎᧦ઙਅߢหᤨߦㅊ〔ߔࠆߎߣ߇น⢻ߢ㧘ߎࠇ߹ߢߦൻቇ㧘↢‛㧘࿾⾰ቇ߿ⅣႺ⑼ቇߥߤߩ᏷ᐢ
޿ಽ㊁ߢ೑↪ߐࠇߡ߈ߚ,  -㧚ߎࠇ߹ߢℂ⎇ $ ࡑ࡞࠴࠻࡟࡯ࠨ࡯ߪ㧘ℂ⎇  ࡝ࡦࠣࠨࠗࠢࡠ࠻ࡠࡦ㧔$$㧕߆ࠄߩ  2( :A08  ! ࡆ࡯ࡓߦࠃࠆ  A ᮡ⊛ߩᩭ⎕⎈෻ᔕᓟ‫ޔ‬A ߩ㈶㉄ࠛ࠴࡞ࠍ↪޿ߚ᛽಴㒰෰ߦࠃߞߡ⵾ㅧߐࠇߡ߈ߚ,  -㧚ߒ߆ߒߥ߇
ࠄߎߩᚻᴺߢߪ㧘  A ߆ࠄ↢ᚑߔࠆ 3 ߆ࠄ #@ ߹ߢߩᄙᢙߩ᡼኿ᕈᩭ⒳ߩߚ߼㧘Ȗ ✢ࠬࡍࠢ࠻ࡠࡔ࠻࡝࡯ߦ߅ߌࠆ $ ߩᬌ಴ᗵᐲߪૐߊ㧘߹ߚቯ㊂ߢ߈ࠆ $ ߩᢙ߽௖߆
ᢙర⚛ߣ㒢ࠄࠇߡ߈ߚ㧚ߘߎߢᧄ⎇ⓥߢߪ㧘ᄤὼห૏૕⚵ᚑߩ nat 3 ࠍᮡ⊛ߣߒߡ㧘$
ߦ․ൻߒߚࡑ࡞࠴࠻࡟࡯ࠨ࡯ߩ⵾ㅧᴺࠍ㐿⊒ߔࠆߎߣࠍ⋡⊛ߣߔࠆ㧚㊄ዻ 3 ᮡ⊛ߪᓥ᧪ߩ A ᮡ⊛ࠃࠅ߽ᄢᒝᐲ㊀ࠗࠝࡦࡆ࡯ࡓߩ㐳ᤨ㑆ᾖ኿ߦ቟ቯߢ㧘ߐࠄߦ $ ห૏૕ߩ↢ᚑᢿ㕙Ⓧ߇  A ࠃࠅ߽ᄢ߈޿ߥߤߩ೑ὐ߇޽ࠆ㧚‫ޣ‬ታ㛎‫ޤ‬㊄ዻ nat 3 ▗㧔⚐ᐲ 㧘ෘߐ 94 09 㧕ࠍ ᨎ㧘 A ㊄ዻ▗㧔ෘߐ 94 09 㧕ߣࡆ࡯ࡓࡕ࠾࠲࡯↪ nat A ㊄ዻ▗㧔ෘߐ 94;3 nat 3@.>42@9;30!"  9;30
 94 09 㧕 ᨎߕߟࠍᮡ⊛ࡎ࡞࠳ߦࠬ࠲
9;3 "㩷
࠶ࠢߒ㧘$$ ߆ࠄߩ  2( :A08  ! ࡆ94;3.  0.>>62>6: 9;3  8
9 ;3 " 9;30࡯ࡓ㧔ࡆ࡯ࡓᒝᐲ㧦 <ȝ㧕ࠍᾖ኿ߒߚ㧚
C.6@3;>96:⍴ኼ๮ߣ㐳ኼ๮ߩᩭ⒳ࠍല₸⊛ߦቯ㊂ߔ
ࠆߚ߼㧘 96: ߣ 5 ߩ ࿁ߩᾖ኿ࠍⴕ ?A< <<@9;3 "ߞߚ㧚ᾖ኿ᓟ㧘 nat 3 ᮡ⊛ ᨎࠍ 64 ߦ 16?0.>194;3 "  9;30!"␜ߒߚᚻ㗅ߦᓥߞߡൻቇಽ㔌ߒ㧘ઁᣇࠍ
94;32  0.>>62>6:  9;3  8
9;3 " 9;3.=! 2D02??
㕖⎕უ⹜ᢱߣߒߡൻቇ෼₸߿ಽ㔌ଥᢙߩ<<@⹏ଔߦ↪޿ߚ㧚৻ᣇ㧘  A ᮡ⊛ࠍ↪޿ߚ ?A<
9;308
16?0.>1
ᓥ᧪ᴺߣᲧセߔࠆߚ߼㧘64 ߣห᭽ߩ52.@@;1>E:2??
9;308 9;308G 㒶࡮㓁ࠗࠝࡦ੤឵ᴺߢ  A ᮡ⊛߆ࠄ $
9;308G
ࠍಽ㔌ߒߚ㧚ಽ㔌ߒߚࡑ࡞࠴࠻࡟࡯ࠨ࡯
:6;:2D05.:42;C2D )F
ߦኻߒߡ㧘2 ᬌ಴ེࠍ↪޿ߡ Ȗ ✢ࠬࡍࠢ
92?561 99G 99࠻ࡠࡔ࠻࡝࡯ࠍⴕߞߚ㧚52.@@;1>E:2??
‫⚿ޣ‬ᨐ‫ ޤ‬nat 3 ߩ⍴ᤨ㑆ᾖ኿ߦ߅޿ߡߪ㧘 9 ;3   8  92@5.:;8 9 ;3   8  92@5.:;8੍஻⊛ߥ߇ࠄ㧘*㧘2㧘A㧘1㧘&/㧘E㧘9;3  8 92@5.:;8G
;㧘>㧘&9㧘*/ ෸߮ A ߩว⸘  ᩭ⒳9;3 8Gࠍหቯߢ߈ߚ㧚ൻቇ෼₸ߪ  એ਄ߢ㧘
.@6;:2D05.:42;C2D )F
 92?561 99G 99
3 ߦኻߔࠆಽ㔌ଥᢙߪ㧘  3 ߩ  72(
ߩ Ȗ ✢߆ࠄ⹏ଔߒߡ㧘 G F ߢ޽ߞߚ㧚
16?0.>1
REE multitracer⸛ ⺰ ળ ߢ ߪ 㧘 㐳 ᤨ 㑆 ᾖ ኿ ߩ ⚿ ᨐ ߿  A 64 %0529.@6016.4>.93;>?2<.>.@6;:;3ᮡ⊛ߩ⚿ᨐ߽วࠊߖߡႎ๔ߔࠆ㧚@52$9A8@6@>.02>3>;9. nat 3‫ޣ‬ෳ⠨ᢥ₂‫ޤ‬, -9/221$!$2B13 , -%:;9;@;et al6;921$2?&>.028292:@?16 
, -%9/2et al5292@@20   #>;1A0@6;:;3>.>22.>@59A8@6@>.02>3>;9nat3@.>42@+*% &%'*− 123 −

3B03ࣇ࢕ࢵࢩ࣭ࣙࣥࢺࣛࢵࢡἲ࡟ࡼࡿ 3D ග᰾ศ⿣཯ᛂ᩿㠃✚ࡢᐃ㔠ἑ኱㝔⮬↛ࠊᮾ໭኱᰾⌮◊ࠊ㔠ἑ኱⌮ᕤ ‫ۑ‬すᕝ ᜨࠊ኱ᵳ ໅ࠊᘅ℩೺ኴ㑻ࠊబ⸨ ΅ࠊᶓᒣ᫂ᙪࠊ୰す Ꮥ࠙ࡣࡌࡵ࡟ࠚࣇ࢕ࢵࢩ࣭ࣙࣥࢺࣛࢵࢡἲࡣࠊᨺᑕ⬟ ᐃࡀ୙ྍ⬟࡞࠸ࡋࡣᅔ㞴࡞Ᏻᐃࡲࡓࡣ
㉸㛗༙ῶᮇ᰾ศ⿣∦ࡸ㉸▷༙ῶᮇ᰾ศ⿣∦ࡢ᳨ฟࡶྍ⬟࡛࠶ࡾࠊᑠࡉ࠸᰾ศ⿣཯ᛂ᩿㠃✚ࡢᐃ࡟ࡶ㐺ࡋ࡚࠸ࡿࠋࡇࢀࡽࡢ฼Ⅼࢆ⏕࠿ࡋ࡚ࠊᮏ◊✲࡛ࡣࣇ࢕ࢵࢩ࣭ࣙࣥࢺࣛࢵࢡἲ࡟ࡼ
ࡿග᰾ศ⿣཯ᛂ᩿㠃✚ࡢ ᐃࢆヨࡳࡓࠋᮏ◊✲࡛ ᐃᑐ㇟࡟ࡋࡓ᰾✀ࡣ231Pa㸦༙ῶᮇ 3.276
104ᖺࠊȘᨺᑕయ㸧࡛࠶ࡿࠋ231Paࡣࠊ◊✲࡟ᚲせ࡞㔞ࢆ☜ಖࡍࡿࡢࡀ㞴ࡋ࠸᰾✀࡛࠶ࡿࡤ࠿ࡾ
࡛࡞ࡃ⢭〇࠾ࡼࡧ⣧ᗘࡢ☜ㄆࡶᅔ㞴࡞᰾✀࡛࠶ࡿࠋࡑࡢࡓࡵ᰾཯ᛂ࡟㛵ࡍࡿᐇ ࢹ࣮ࢱࡢྲྀ
ᚓࡣ㐜ࢀ࡚࠸ࡿࠋࡑࡇ࡛ᮏ◊✲࡛ࡣࠊ᰾཯ᛂࢹ࣮ࢱࡢᐇ ⓗྲྀᚓࡀᑡ࡞࠸231Paࡢග᰾ศ⿣཯
ᛂ᩿㠃✚࡟ࡘ࠸࡚ࠊኳ↛࢘ࣛࣥ㸦௨ୗnU࡜グࡍ㸧࡜232Thࢆẚ㍑ᑐ㇟࡜ࡍࡿ͂ࣇ࢕ࢵࢩ࣭ࣙࣥ
ࢺࣛࢵࢡᩘࢱ࣮ࢤࢵࢺཎᏊᩘ̓ࡢ┦ᑐⓗ࡞ホ౯࠿ࡽ◊✲ࢆጞࡵࡿࡇ࡜࡜ࡋࡓࠋ࠙ᐇ 㦂ࠚ ᮏ◊✲࡛ࡣࠊࡲࡎࢺࣛࢵࢡ᳨ฟᮦࡢ✀㢮࡜᭱㐺࢚ࢵࢳࣥࢢ᮲௳ࢆ᳨ウࡍࡿࡓࡵ࡟ࠊ
ྜᡂ▼ⱥᯈ࡜ⓑ㞼ẕᯈࢆ᳨ฟᮦ࡜ࡍࡿᐇ㦂ࢆ⾜ࡗࡓࠋࢱ࣮ࢤࢵࢺ᰾✀㸦231PaࠊnUࠊ232Th㸧ࡢ⃰ᗘ᪤▱⁐ᾮࡢ᪤▱㔞ࢆࡑࢀࡒࢀ㧗⣧ᗘ▼ⱥᯈ㸦1cm1cm1mm㸧ୖ࡟⵨Ⓨ஝ᅛࡉࡏࠊࡇࢀ
࡟⇕࢔ࢽ࣮ࣜࣥࢢฎ⌮࡜⃰◪㓟↻ἛὙίࢆ᪋ࡋࡓⓑ㞼ẕᯈ㸦࢖ࣥࢻ ࣅࣁ࣮ࣝᕞ⏘ࠊ1cm1cm
ࡢⷧ∦㸧ࢆᐦ╔ࡉࡏ࡚࢔࣑ࣝࢽ࣒࢘⟩࡛ໟࡳࠊ↷ᑕヨᩱ࡜ࡋࡓࠋPaࠊUࠊThࡢྛ↷ᑕヨᩱ࡜ࣂࢵࢡࢢࣛ࢘ࣥࢻ⏝ヨᩱࠊࣅ࣮࣒ࣔࢽࢱ࣮⏝Co⟩ࢆ㸯ࢭࢵࢺ࡜ࡋ࡚ࠊᮾ໭኱ᏛཎᏊ᰾⌮Ꮫ◊✲᪋タ࡛᭱኱࢚ࢿࣝࢠ࣮20 MeVࡢไືᨺᑕ⥺㸦㟁Ꮚ⥺ᙧຍ㏿ჾ࠿ࡽࡢ㟁Ꮚࣅ࣮࣒ࢆⓑ㔠ᯈ࡛ไືᨺᑕ⥺࡟㌿᥮ࠊ㟁Ꮚ⥺࡟ࡼࡿࢺࣛࢵࢡ᳨ฟᮦࡢຍ⇕ࢆ㑊ࡅࡿࡓࡵ࡟ࢫ࢖࣮ࣉ࣐ࢢࢿࢵࢺ࡛ᮍ㌿᥮㟁Ꮚࢆ㝖ཤ㸧ࢆ↷ᑕࡋࡓࠋ↷ᑕᚋࠊ▼ⱥ࡜㞼ẕࢆ࢚ࢵࢳࣥࢢࡋࠊὙί࣭஝⇱ࢆ⾜ࡗ࡚࠿ࡽࠊࢹࢪࢱࣝࢫࢥ࣮ࣉࢆ⏝࠸࡚ࢺࣛࢵࢡࡢほᐹ࡜ィᩘࢆ⾜ࡗࡓࠋ࠙⤖ᯝ࡜⪃ᐹࠚ▼ⱥᯈࡣ⾲㠃࡟യࡸởࢀࡀᑡ࡞ࡃࠊࢺࣛࢵࢡ
ࡢィᩘࡀᐜ࡛᫆࠶ࡿ༙㠃ࠊ᳨ฟᮦࡑࡢࡶࡢࡢ࢚ࢵࢳࣥࢢ๣࡟
ࡼࡿ⭉㣗㸦ࣂࣝࢡ࢚ࢵࢳࣥࢢ㸧㏿ᗘࡀ㏿ࡃࠊ࢚ࢵࢳࣥࢢ᮲௳
ࡢࢥࣥࢺ࣮ࣟࣝࡀ㞴ࡋ࠸࡜࠸࠺ḞⅬࡀ࠶ࡿࠋ᳨ウࡢ⤖ᯝࠊ▼ⱥᯈ࡟ࡘ࠸࡚ࡣ 28%ࣇࢵ໬Ỉ⣲࢔ࣥࣔࢽ࣒࢘Ỉ⁐ᾮࢆ࢚ࢵࢳࣥࢢ๣࡟⏝࠸ࠊ㉸㡢Ἴࢆ༳ຍࡋ࡞ࡀࡽ 15 ศ㛫࢚ࢵࢳࣥࢢ
▼ⱥࢆ⾜࠺ࡢࡀ㐺ᙜ࡛࠶ࡿ࡜ศ࠿ࡗࡓ㸦ྑᅗୖ㸧ࠋ㞼ẕࡣࠊࣂࣝ
ࢡ࢚ࢵࢳࣥࢢࡀ࡯࡜ࢇ࡝↓࠸ࡓࡵࢺࣛࢵࢡ᳨ฟຠ⋡ࡀⰋ࠸㞼ẕ࡜ゝࢃࢀ࡚࠸ࡿࡀࠊ⾲㠃࡟യࡸởࢀࡀከ࠸ࡇ࡜ࠊኳ↛࢘ࣛࣥ࡟ࡼࡿࢺࣛࢵࢡࡀࣂࢵࢡࢢࣛ࢘ࣥࢻ࡜࡞ࡿࡇ࡜ࠊ࢚ࢵࢳࣥࢢ
୰ࡢ๤㞳࡟ࡼࡗ࡚ࢺࣛࢵࢡࡀኻࢃࢀࡿ࡞࡝ࡢḞⅬࢆࡶࡘࠋ᳨
ウࡢ⤖ᯝࠊ㞼ẕ࡟ࡘ࠸࡚ࡣ 48%ࣇࢵ໬Ỉ⣲㓟ࢆ⏝࠸ࠊ㉸㡢Ἴ
࡞ࡋ࡛ 40 ศ㛫࢚ࢵࢳࣥࢢࢆ⾜࠺ࡢࡀ㐺ᙜ࡛࠶ࡿࡇ࡜ࡀศ࠿
50µm
ࡗࡓ㸦ྑᅗୗ㸧ࠋ Ⓨ⾲࡛ࡣࠊྠ᫬࡟↷ᑕࡋࡓ231PaࠊnUࠊ232Th࡟ࡘ࠸࡚ࠊ͂ග
᰾ศ⿣ࢺࣛࢵࢡᩘࢱ࣮ࢤࢵࢺཎᏊᩘ̓㸦㹒㸧ࢆ㹒 231Pa 㹒nU ࠊ㹒(231Pa)/㹒 232Th)࡜ࡋ࡚ẚ㍑ࡋࡓ⤖ᯝࢆሗ࿌ࡍࡿࠋほᐹࡉࢀࡓࣇ࢕ࢵࢩ࣭ࣙࣥ
ࢺࣛࢵࢡ

Measurement of Pa-231 photofission cross-section by fission track method
NISHIKAWA, M., OHTUKI, T., HIROSE, K., SATO, W., YOKOYAMA, A., NAKANISHI, T.
− 124 −

3B04ਛ㑆ࠛࡀ࡞ࠡ࡯㗔ၞߩ Cu‫ޔ‬Nb ਛᕈሶᩭ෻ᔕᢿ㕙Ⓧ᷹ቯ(II)
(㒋ᄢ㒮ℂ 1‫ޔ‬ේሶജᯏ᭴ 2‫ޔ‬੩ᄢේሶἹ 3‫ޔ‬㒋ᄢ RCNP4‫ޔ‬㜞ࠛࡀ⎇ 5‫࡯ࡘ࠺ࡄޔ‬ᄢ 6‫ޔ‬࿖┙ᱧผ᳃ଶඳ‛㙚 7‫ࠕ࠾࡞ࠜࡈ࡝ࠞޔ‬ᄢ 8)٤የᧄ㓉ᔒ 1‫ޔ‬ੑች๺ᒾ 1, 2‫ޔ‬ਛ၂㤀ሶ 1‫ޔ‬㜞ᯅᚑੱ 1‫ޔ‬㑐ᧄବ 3‫ޔ‬ቝㇺችᢘ 3‫౎ޔ‬ፉᶈ 3‫ޔ‬ᩊ↰⺈৻ 3‫ޔ‬᎑㆐ᔒ 4‫ޔ‬ᧁਅື৻ 5‫᧛᧻ޔ‬ብ 5‫⪤ޔ‬ේ㓷ਯ 5‫ޔ‬ጤరᵗ੺ 2‫ޔ‬૒⮮ᄢ᮸ 2‫ޔ‬M. W. Caffee6‫ޔ‬੹᧛ፃ㓶 7‫⷏ޔ‬ᴰ㇌ᒾ 8‫◉ޔ‬ේෘ 1‫ޣ‬ᐨ⺰‫ߚ߈ߡࠇࠊⴕߢ߹ࠇߎޤ‬ਛᕈሶᩭ෻ᔕߩታ㛎ߪ‫ޔ‬ේሶἹ߿㊀㊄ዻ࠲࡯ࠥ࠶࠻߳ߩ⩄㔚☸ሶ౉኿ߢᓧߚ⊕⦡ਛᕈሶࠍ೑↪ߔࠆ႐ว߇߶ߣࠎߤߢ޽ࠅ‫ޔ‬ૐࠛࡀ࡞ࠡ࡯㗔ၞ(㧨10MeV)ߢߩታ㛎࠺࡯࠲ߪ⼾ንߦሽ࿷ߔࠆ߇‫ޔ‬ਛ㜞ࠛࡀ࡞ࠡ࡯㗔ၞ㧔㧪50MeV㧕ߩ࠺࡯࠲‫ߦ․ޔ‬න⦡ߩਛᕈሶࠍ↪޿ߚታ㛎ߪ߶ߣࠎߤߥ޿‫ޕ‬ਛᕈሶߪ㔚⩄ࠍᜬߚߥ޿ߚ߼‫ޔ‬ૐࠛࡀ࡞ࠡ࡯ߢߩᩭ
෻ᔕߪ࡙࠾࡯ࠢߥ᜼േࠍ␜ߔߩߦኻߒ‫ޔ‬㜞ࠛࡀ࡞ࠡ࡯ߢߪ㔚⩄ߩᓇ㗀߇⋧ኻ⊛ߦዊߐߊߥࠅ‫ޔ‬หߓࡂ࠼ࡠࡦߢ޽ࠆ㓁ሶߣૃߡ޿ࠆߣ੍᷹ߐࠇߡ޿ࠆ‫ߥ߁ࠃߩߎޕ‬Ꮕ⇣߇ߤߩ⒟ᐲߩࠛࡀ࡞
ࠡ࡯㗔ၞ߹ߢሽ࿷ߔࠆߩ߆‫ߚ߹ޔ‬ਛᕈሶߣ㓁ሶߩᩭ෻ᔕᯏ᭴ߩ⋧㆑ߦߟ޿ߡ⥝๧߇ᜬߚࠇߡ
޿ࠆ߇‫ޔ‬ਛ㜞ࠛࡀ࡞ࠡ࡯㗔ၞߦ߅޿ߡߪ㓁ሶߣᲧセߢ߈ࠆਛᕈሶᩭ෻ᔕߩታ㛎࠺࡯࠲ߪߥ޿‫ޕ‬߹ߚ‫ޔ‬ਛ㜞ࠛࡀ࡞ࠡ࡯ߩਛᕈሶߦࠃࠆᩭ෻ᔕߩ⍮⷗ߪ‫ޔ‬ടㅦེᣉ⸳ߩㆤ⭁૕ߩ⫾Ⓧ᡼኿⢻ߩ⹏ଔ߿‫ޔ‬㓓⍹߿࿾⴫㕙ߦኻߔࠆቝቮ✢ߩᾖ኿ᥲߩ⹏ଔߦ߅޿ߡၮ␆࠺࡯࠲ߣߒߡᔅⷐߣߐࠇ
ߡ޿ࠆ‫⎇ᧄޕ‬ⓥߢߪ‫ޔ‬ᤓᐕᐲႎ๔ߒߚ 368 MeV ߩන⦡ਛᕈሶࠍ↪޿ߚታ㛎[1]ߦട߃‫ޔ‬ᣂߚߦ
282 MeV ߩන⦡ਛᕈሶࠍ↪޿ߚታ㛎ࠍⴕߞߚߩߢႎ๔ߔࠆ‫ޕ‬‫ޣ‬ታ㛎‫⎇ᧄޤ‬ⓥࠣ࡞࡯ࡊߢߪ‫ޔ‬ᄢ㒋ᄢቇᩭ‛ℂ⎇ⓥ࠮ࡦ࠲࡯N0 ࠦ࡯ࠬߦ߅޿ߡ‫ޔ‬7Li(p,n)෻ᔕ
ߦࠃࠅ⊒↢ߔࠆਛᕈሶࠍੑߟߩᣇะߢ೑↪ߔࠆߎߣߢ‫ޔ‬ᣂߚߦන⦡ਛᕈሶࠍᓧࠆᚻᴺࠍ⏕┙ߒߚ[2]‫ᧄޕ‬ታ㛎ߢߪ 300 MeV ߩ㓁ሶߩ౉኿ߦࠃࠅਛᔃࠛࡀ࡞ࠡ࡯282 MeV ߩන⦡ਛᕈሶࠍᓧߚ‫ ࠍࠇߎޕ‬Cu ෸߮ Nb ߩ㊄ዻ᧼߳ᾖ኿ߒ‫ޔ‬HP-Ge ᬌ಴ེࠍ↪޿ߚࠟࡦࡑ✢ࠬࡍࠢ࠻ࡠࡔ࠻࡝
࡯ߦࠃࠅ‫ޔ‬ᾖ኿⹜ᢱਛߦ↢ᚑߒߚ᡼኿ᕈర⚛ࠍቯ㊂ߒ‫ޔ‬Cu‫ޔ‬Nb ߩ 282 MeV න⦡ਛᕈሶߦࠃ
ࠆਥߦᩭ⎕⎈↢ᚑ‛ߩ↢ᚑᢿ㕙Ⓧࠍዉ಴ߒߚ‫ޕ‬‫⚿ޣ‬ᨐߣ⠨ኤ‫ᧄޤ‬ታ㛎ߢᓧࠄࠇߚᩭ෻ᔕᢿ㕙Ⓧࠍ 368 MeV ߩන⦡ਛᕈሶ౉኿ߩታ㛎[1]ߣᲧセߒߚ⚿ᨐ‫ޔ‬ᮡ⊛ᩭ߆ࠄߩ⾰㊂ᢙᷫዋߩዊߐߥᩭ⒳ (Cu ਛߩ 60Co‫ޔ‬56Co ߥߤ)ߪห⒟ᐲߩ୯߇ᓧ
ࠄࠇߚߩߦኻߒ‫⾰ޔ‬㊂ᢙᷫዋߩᄢ߈ߥᩭ⒳(46Sc‫ޔ‬48V ߥߤ) ߢߪᧄታ㛎ߩᣇ߇ዊߐߥ୯߇ᓧࠄ
ࠇߚ‫↢ߩߎޕ‬ᚑ㊂ߩࠛࡀ࡞ࠡ࡯ଐሽᕈߪ‫ޔ‬㓁ሶ‫ޔ‬ǩ☸ሶߦࠃࠆᩭ⎕⎈෻ᔕߩ↢ᚑᩭಽᏓߣ߽
৻⥌ߔࠆ‫ߢߎߘޕ‬ਛᕈሶߦࠃࠆᩭ⎕⎈෻ᔕߦߟ޿ߡቯ㊂⊛ߥ⼏⺰ࠍⴕ߁ߚ߼ߦ‫ޔ‬ᩭ⎕⎈෻ᔕߦ㑐ߔࠆ Rudstam ߩ⚻㛎ᑼ[3]ࠍ↪޿ߡᩭ෻ᔕᢿ㕙Ⓧߩታ㛎୯ߩࡈࠖ࠶࠹ࠖࡦࠣࠍⴕߞߚ‫ޕ‬ᤓᐕᐲ⊒⴫ߒߚ࠺࡯࠲ࠍวࠊߖࠆߎߣߢ‫ޔ‬ਛᕈሶᩭ෻ᔕߦࠃࠆᩭ⒳↢ᚑ㊂ߪ㓁ሶߣห᭽ߩ౉኿
☸ሶࠛࡀ࡞ࠡ࡯ଐሽࠍ␜ߒߡ߅ࠅ‫৻ߚ߹ޔ‬ᣇߢ㓁ሶߣᲧߴߡ౉኿☸ሶߩ㔚⩄ߦነਈߔࠆߣ⠨߃ࠄࠇࠆ↢ᚑ㊂ߩᏅ߇޽ࠆߎߣ߇ಽ߆ߞߚ‫ޕ‬‫ޣ‬ෳ⠨ᢥ₂‫ޤ‬[1] የᧄ ઁ ╙ 52 ࿁᡼኿ൻቇ⸛⺰ળ 3A08(2008)[2] ੑች ઁ ╙ 52 ࿁᡼኿ൻቇ⸛⺰ળ 1P17(2008)[3] G. Rudstam Z. Naturforschg. 21 (1966) 1027
Cross section measurements of neutron-induced reactions for Cu and Nb in the intermediately energy
region (II)OMOTO, T., NINOMIYA, K., NAKAGAKI, R., TAKAHASHI, N., SEKIMOTO, S., UTSUNOMIYA, T.,
YASHIMA, H., SHIBATA, S., SHIMA, T., KINOSHITA, N., MATSUMURA, H., HAGIWARA, M.,
IWAMOTO, Y., SATOH, D., M. W. CAFFEE, IMAMURA. M., NISHIIZUMI, K., SHINOHARA, A.
− 125 −

3B05

7KJ ࡢ༙ῶᮇᐃ㜰኱㝔⌮ 㸪ᮾ໭኱ከඖ≀㉁⛉Ꮫ◊ 㸪ᮾᕤ኱ཎᏊ⅔◊  ‫⳥ۑ‬Ọⱥᑑ 㸪୕㢌⫄᫂ 㸪㕥ᮌ㐩ஓ 㸪㔝ᮧ㞞ኵ 㸪⠛ཎཌ ࠙ࡣࡌࡵ࡟ࠚ 229Th ࡣࢿࣉࢶࢽ࣒࢘⣔ิ㸦4n+1 ⣔ิ㸧࡟ᒓࡍࡿȘᨺฟ᰾✀࡛࠶ࡾ㸪ኳ↛࡟࡯࡜ࢇ࡝Ꮡᅾࡋ࡞࠸ࡓࡵ㸪ࢺ࣒ࣜ࢘ࢺ࣮ࣞࢧ࣮࡜ࡋ࡚⏝࠸ࡽࢀ࡚ࡁ࡚࠸ࡿ[1]ࠋ229Th ࡣᩘ༓ᖺࡢ
༙ῶᮇࢆᣢࡘࡓࡵ࡟㸪ᨺᑕ⬟ ᐃࡔࡅ࡛ࡣ࡞ࡃྠ఩యᕼ㔘㉁㔞ศᯒἲ࡛ࡢ ᐃࡶ⾜ࢃࢀ࡚࠾ࡾ[2]㸪ࡑࡢ༙ῶᮇࡣ㔜せ࡞್࡛࠶ࡿࠋࡋ࠿ࡋ࡞ࡀࡽ㸪ࡇࢀࡲ࡛⾜ࢃࢀࡓ༙ῶᮇ ᐃࡣ㸪7340
s160 y [3]㸪7880s120 y [2]࡜ 7%⛬ᗘࡢᕪࡀ࠶ࡿࠋࡑࡇ࡛ᮏ◊✲࡛ࡣ 233U-229Th㸪232U-228Th ࡢ
2 ࡘࡢቯኚ㐃㙐ࢆ⏝࠸࡚ 229Th ࡢ༙ῶᮇࢆồࡵࡓࡢ࡛ሗ࿌ࡍࡿࠋ
࠙ᐇ㦂ࠚ ㉁㔞ᩘ 233, 234, 235, 236, 238 ࡢྠ఩యẚࢆ TIMS ࡛ ᐃࡋ࡚࠶ࡿ⣙ 10 mg ࡢ U ྠ఩య࠿ࡽ㸪㝜࢖࢜ࣥ஺᥮ᶞ⬡࣒࢝ࣛ(Muromac 18, 200-400 mesh)ࢆ⏝࠸࡚ Th ྠ఩యࢆྲྀࡾ㝖
࠸ࡓࠋU ྠ఩యࡢ୍㒊ࢆศྲྀࡋ㸪Ỉ㓟໬ࢧ࣐࣒ࣜ࢘ඹỿἲ[4]࡛⥺※ࢆసᡂࡋ࡚Ș⥺ࢫ࣌ࢡࢺ࣓ࣟࢺ࣮ࣜࢆ⾜࠺ࡇ࡜࡛ 232U/233U ྠ఩యẚࢆồࡵࡓࠋ ḟ࡟㸪⢭〇ࡋࡓ U ྠ఩యࢆ 3 ᪥࠿ࡽ 289 ᪥ᨺ⨨ࡋ࡚㸪Th ྠ఩యࢆᡂ㛗ࡉࡏࡓࠋࡇࡢ Th ྠ఩యࢆ㝜࢖࢜ࣥ஺᥮ᶞ⬡࣒࢝ࣛ(Muromac 18, 200-400 mesh)ࢆ⏝࠸࡚ U ྠ఩య࠾ࡼࡧፉࡢ Raྠ఩య࠿ࡽศ㞳㸪⢭〇ࡋ࡚Ỉ㓟໬ࢧ࣐࣒ࣜ࢘ඹỿἲ[4]࡛⥺※ࢆసᡂࡋ࡚Ș⥺ࢫ࣌ࢡࢺ࣓ࣟࢺ
࣮ࣜࢆ⾜࠺ࡇ࡜࡛ 228Th/229Th ྠ఩యẚࢆồࡵࡓࠋ࠙⤖ᯝ࡜⪃ᐹࠚ ᚓࡽࢀࡓ U ྠ఩యࡢȘࢫ࣌ࢡࢺࣝࢆ
Fig. 1 ࡟♧ࡍࠋ232U ࡜ 233U ࡢȘࣆ࣮ࢡࡣ᫂☜࡟ศ࠿ࢀ࡚
࠾ࡾ㸪TIMS ࡛ ᐃࡋࡓ U ྠ఩యẚࡶ⪃៖ࡍࡿ࡜㸪232
U/233U ྠ఩యẚࡣ 4.6210-7 ࡛࠶ࡗࡓࠋFig. 2 ࡟ᚓࡽࢀࡓ Th ྠ఩యࡢȘࢫ࣌ࢡࢺࣝࢆ♧ࡍࠋ228Th/229Th ྠ఩యẚࢆồࡵࡿ㝿㸪228Th ࡢ 5423 keV ࣆ࣮ࢡ࡟ 224Ra ࡢ 5449
keV ࣆ࣮ࢡࡀ㔜࡞ࡿࡓࡵ㸪224Ra ࡢ 5685 keV ࣆ࣮ࢡࢆ⏝࠸࡚ࡑࡢᐤ୚ࢆぢ✚ࡶࡾ⿵ṇࡋࡓࠋ232U/233U ྠ఩యẚ㸪
Th ྠ఩యࡢᡂ㛗᫬㛫࠾ࡼࡧ 232U (T1/2 = 68.9s0.4 y [5])㸪
233
U (T1/2 = 159200s200 y [5])㸪228Th (T1/2 = 1.9116s
0.0016 y [5])ࡢྛ༙ῶᮇ࠿ࡽ 229Th ࡢ༙ῶᮇࢆồࡵࡓ࡜ࡇࢁ㸪 Fig. 1. U ྠ఩యࡢȘࢫ࣌ࢡࢺࣝ
7896s66 y ࡢ༙ῶᮇࡀᚓࡽࢀࡓࠋ
ࡇࡢ༙ῶᮇࡣ Goldsteinand Murrell [2]ࡢ್࡟୍⮴ࡋ࡚࠸ࡿࠋHagemann ࡽ[3]ࡢ್
࡜୍⮴ࡋ࡞࠸⌮⏤ࡣ㸪࠾ࡑࡽࡃ Th ྠ఩య࠿ࡽ U ྠ఩యࡢศ㞳ࡀ୙༑ศࡔࡗࡓࡓࡵ࡟ 233U ࡢィᩘࡀ 229Th ࡢィᩘ࡟ຍࢃࡾ㸪༙ῶᮇࡀ▷ࡃ⟬ฟࡉࢀࡓ࡜⪃࠼ࡽࢀࡿࠋ
ཧ⪃ᩥ⊩[1] M. T. Crespo, Appl. Radiat. Isot. 53, 897 (2007)[2] S. J. Goldstein and M. T. Murrell, Phys. Rev. C40 (1989) 2793.
[3] F. Hagemann et al., Phys. Rev. 79 (1950) 435.
[4] H. Kikunaga et al., Appl. Radiat. Isot. 67 (2009) 539.
[5] R. B. Firestone and V. S. Shirley, eds., Table of Isotopes (John Wiley& Sons, Inc., 1996), 8th ed.

Fig. 2. Th ྠ఩యࡢȘࢫ࣌ࢡࢺࣝ

Measurement of the half-life of Th-229g
KIKUNAGA, H., MITSUGASHIRA, T., SUZUKI, T., NOMURA, M., SHINOHARA, A.
− 126 −

3B06

Ꮧ࿯㘃㗔ၞ࠲࡯ࠥ࠶࠻ߣ㉄⚛ ㊀ࠗࠝࡦᩭⲢวബ⿠㑐ᢙߦ߅ߌࠆ
ᩭᄌᒻᐲߩᓇ㗀 ㊄ᴛᄢ㒮⥄ὼ 㒋ᄢ㒮ℂ ㊄ᴛᄢℂᎿ  ٤ᵻ㊁ᢕผ ⽴⼱⧷᮸ ⨹ᧁᐙᄦ ⷏Ꮉᕺ ᄢᳯ৻ᒄ ⩵᳗⧷ኼ 㜞ᯅᚑੱ ᮮጊ᣿ᒾ ෻ᔕᢿ㕙Ⓧ㪆㫄㪹

‫ޣ‬ᐨ⺰‫⃻ޤ‬࿷㊀ర⚛วᚑߢߪ‫࠼࠾࠴ࠢࠕ⿥ޔ‬ర⚛ࠍวᚑߔࠆࠃ߁ߥ㊀޿♽߇⥝๧ࠍᜬߚࠇߡ
޿ࠆ‫↢ߪߢ♽ߥ߁ࠃߩߎޕ‬ᚑᢿ㕙Ⓧ߇ᭂ߼ߡዊߐߊ‫ޔ‬ല₸ࠃߊวᚑߔࠆ᧦ઙࠍ⍮ࠆߚ߼ߦߪ
෻ᔕᯏ᭴ࠍℂ⸃ߔࠆߎߣ߇㊀ⷐߢ޽ࠆ‫࠼ࠗࡁ࠴ࠢࠕޕ‬ේሶᩭߪᄌᒻᩭߢ޽ࠅ‫ߩߘޔ‬ᄌᒻᐲߪᄢ߈޿‫ޕ‬ᮡ⊛ᩭߦߎߩࠃ߁ߥᄌᒻᩭࠍ↪޿ߚ႐ว‫⃿ޔ‬ᒻᩭࠍ↪޿ߚ႐วߣᲧߴ↢ᚑ⏕₸ߦᓇ㗀߇޽ࠄࠊࠇ‫ࡦࡠ࡯ࠢޔ‬㓚ო⒟ᐲߩૐࠛࡀ࡞ࠡ࡯ߦ߅޿ߡ⃿ᒻᩭࠍ↪޿ߚ႐วࠃࠅ߽߿߿ૐ
޿ࠛࡀ࡞ࠡ࡯ߢᩭⲢว߇ᆎ߹ࠆߎߣ߇ᦼᓙߐࠇࠆ‫ޕ‬ᧄ⎇ⓥߢߪᲧセ⊛ᄌᒻᐲߩᄢ߈޿ 169Tm(࿁ォᬦ౞૕ߩ࿁ォゲᣇะߩ㐳ߐࠍ a‫ޔ‬࿁ォゲߦု⋥ᣇะߩ㐳ߐࠍ b ߣߔࠆߣ a/b=0.95)ࠍ࠲࡯ࠥ࠶࠻ߣߒߡ↪޿‫ޔ‬16O ߣߩᩭⲢว෻ᔕߦࠃࠆ෻ᔕ
↢ᚑ‛ߩ᡼኿⢻߆ࠄᢿ㕙Ⓧࠍ᳞߼‫ޔ‬એ೨ⴕߞߚᄌᒻᐲߩዊߐ޿ natBa(a/b=1.01)‫߮ࠃ߅ޔ‬nat
La(a/b=1.01)ߩᢿ㕙Ⓧ߅ࠃ߮ℂ⺰⊛ߥബ⿠㑐ᢙߣᲧセߒ‫ޔ‬ᩭᄌᒻᐲ߇ബ⿠㑐ᢙߦߤߩࠃ߁ߥ
ᓇ㗀ࠍਈ߃ߡ޿ࠆ߆⠨ኤߒߚ‫ޕ‬‫ޣ‬ታ㛎‫ޤ‬ታ㛎ߪᄢ㒋ᄢቇᩭ‛ℂ⎇ⓥ࠮ࡦ࠲࡯ߦߡ 16O ࡆ࡯ࡓࠍ↪޿‫ࠢ࠶࠲ࠬޔ‬ᴺ㧔㐳ኼ๮↢ᚑ‛᷹ቯ㧕‫ޔ‬෸߮ࠟࠬࠫࠚ࠶࠻ᴺ㧔⍴ኼ๮↢ᚑ‛᷹ቯ㧕ߩ 2 ㅢࠅߩᣇᴺߦࠃߞߡⴕߥߞߚ‫ࠬޕ‬
࠲࠶ࠢᴺߢߪ㜞⚐ᐲߩࠕ࡞ࡒࡎࠗ࡞ 99.999㧑 ߦ㔚⌕ߒߚ Tm ࠲࡯ࠥ࠶࠻ࠍ 2 ᨎߥ޿ߒ 3 ᨎ㊀ߨวࠊߖߡࠬ࠲࠶ࠢߦߒ‫࠻࠶ࠥ࡯࠲ޔ‬ਛᔃࠛࡀ࡞ࠡ࡯72MeV㨪112MeV ߩ 16O ࠗࠝࡦࠍ 5 ಽ㨪
60 ಽ㑆ᾖ኿ߒߚ‫ޕ‬ᾖ኿ᓟฦ࠲࡯ࠥ࠶࠻ߦಽߌߡࡐ࡝ࠛ࠴࡟ࡦࠪ࡯࠻ߦኽ౉ߒ‫ޔ‬Ge ඨዉ૕ᬌ಴
ེࠍ↪޿ߡǫ✢᷹ቯࠍⴕߞߚ‫࠻࠶ࠚࠫࠬࠟޕ‬ᴺߢߪࠬ࠲࠶ࠢᴺߣห᭽ߩ࠲࡯ࠥ࠶࠻ߦߟ޿ߡ
ห᭽ߩ 16O ࠗࠝࡦߢ 1 ಽ㑆‫ޔ‬5 ಽ㑆‫ޔ‬20 ಽ㑆ߩᾖ኿ࠍߘࠇߙࠇⴕߞߚ‫ޕ‬෻ᔕ↢ᚑ‛ߪ↢ᚑᓟࠍ⋥ߜߦ KCl ࠢ࡜ࠬ࠲࡯ߦๆ⌕ߒ‫ޔ‬He ࠟࠬߣߣ߽ߦࠠࡖࡇ࡜࡝࡯࠴ࡘ࡯ࡉߦࠃߞߡ 70 m 㔌ࠇߚ RI ታ㛎ቶ߹ߢ៝ㅍߒߚ‫៝ޕ‬ㅍߐࠇߚ෻ᔕ↢ᚑ‛ࠍࡈࠖ࡞࠲࡯ߢ᝝㓸ߒࡐ࡝ࠛ࠴࡟ࡦࠪ࡯
࠻ߦኽ౉ߒห᭽ߩǫ✢᷹ቯࠍⴕߞߚ‫ޕ‬‫⚿ޣ‬ᨐߣ⠨ኤ‫ޤ‬᷹ቯߐࠇߚ↢ᚑ‛ߩ᡼኿⢻ߣࡕ࠾࠲࡯෻ᔕߦࠃࠆࡆ࡯ࡓ㊂᷹ቯ୯߆ࠄ‫ޔ‬୘‫ޘ‬ߩ↢ᚑ‛ߩ෻ᔕᢿ㕙Ⓧࠍ᳞߼ߚ‫ޕ‬Tm+O ߆ࠄᓧࠄࠇߚ↢ᚑ‛ߩᢿ㕙Ⓧࠍ࿑ߦ␜ߒ‫ߩࠄࠇߘޔ‬ᢿ㕙Ⓧࠍ⚿ࠎߛ߽ߩࠍታ✢ߢ‫ޔ‬La+O ߅ࠃ߮㪈㪅㪇㪜㪂㪇㪊
㪠㫉㪄㪈㪏㪉
Tm+O ߆ࠄᓧࠄࠇߚቢోⲢว෻ᔕ⚻↱↢ᚑ‛ߩ
Tm+O ోⲢวᢿ㕙Ⓧ
㪠㫉㪄㪈㪏㪈
ᢿ㕙Ⓧࠍߔߴߡ⿷ߒวࠊߖߚബ⿠㑐ᢙࠍ⎕✢ߢ㪠㫉㪄㪈㪏㪇
㪈㪅㪇㪜㪂㪇㪉
࿑ߦ␜ߒߚ‫ߩࡈ࡜ࠣޕ‬ᮮゲߪฦ㊀ᔃ♽ߩ౉኿ࠛࡀ࡞ࠡ࡯߆ࠄࠢ࡯ࡠࡦࡃ࡝ࠕࠍᏅߒᒁ޿ߚ୯ߢ
޽ࠆ‫ޕ‬2 ߟߩബ⿠㑐ᢙࠍᲧセߔࠆߣ Tm+O ߩᣇ㪈㪅㪇㪜㪂㪇㪈
߇ૐࠛࡀ࡞ࠡ࡯߆ࠄബ⿠㑐ᢙ߇┙ߜ਄߇ߞߡ޿
La+O ోⲢวᢿ㕙Ⓧࠆߎߣ߇ࠊ߆ࠆ‫ࠄ߆ߣߎߩߎޕ‬ᄌᒻᐲߩᄢ߈޿
㪈㪅㪇㪜㪂㪇㪇
㪄㪊㪇
㪄㪉㪇
㪄㪈㪇
㪇
㪈㪇
㪉㪇
㪊㪇
㪋㪇
Tm ߢߪ‫ޔ‬ᄌᒻᐲߩዊߐ޿ La ߦᲧߴᄌᒻߦࠃࠆ
Ecm㧙B / MeVᓇ㗀߇⴫ࠇߡ޿ࠆน⢻ᕈ߇⠨߃ࠄࠇࠆ‫ޕ‬

Nuclear deformation effect on the excitation function of heavy ion fusion reaction on rare earth
targets with the O-16 projectile.
Asano, A., Kaiya, H., Araki, M., Nishikawa, M., Ooe, K., Kikunaga., H., Takahashi, N., Yokoyama, A.
− 127 −

3B07

19

F + 209Bi ෻ᔕߦ߅ߌࠆࠨࡉࡃ࡝ࡗ࡯Ⲣว㒖ኂේሶജᯏ᭴࡮వ┵ၮ␆࠮ ‫ޔ‬ℂ⎇࡮ੳ⑼࠮ ‫᧲ޔ‬ᄢ࡮ℂ ‫ޔ‬ᣂẟᄢ࡮ಽᨆ࠮ ٤⷏ਛ৻ᦶ ‫⦟᧻═ޔ‬ፏ ‫⼱ޔ‬Ꮉൎ⥋ ‫ޔ‬ᓟ⮮⌀৻ ‫ޔ‬ᵻ੗㓷ੱ ‫ޤߦ߼ߓߪޣ‬ㄭᐕ‫ޔ‬㊀ࠗࠝࡦᩭⲢว෻ᔕߦ߅޿ߡⲢว㓚ოࠃࠅૐ޿ࠛࡀ࡞ࠡ࡯‫ࠨࠆࠁࠊ޿ޔ‬ࡉࡃ࡝ࡗ࡯㗔ၞߢߪ‫ޔ‬ᮡḰ⊛ߥℂ⺰ࡕ࠺࡞ߩ੍᷹ߦᲧߴߡ‫ޔ‬ᩭⲢว߇ᄢ߈ߊ㒖ኂߐࠇߡ޿ࠆ
ߎߣ߇⊒⷗ߐࠇ‫ޔ‬ේሶᩭ෻ᔕ⎇ⓥಽ㊁ߢߩ࠻ࡇ࠶ࠢࠬߣߒߡᵈ⋡ߐࠇߡ޿ࠆ[1]‫ࠨ߇ࠈߎߣޕ‬ࡉࡃ࡝ࡗ࡯㗔ၞߢߩᩭⲢวᢿ㕙Ⓧߩ᷹ቯߪ࿎㔍ߥߚ߼⎇ⓥ଀߇㒢ࠄࠇࠆ‫Ⲣ࡯ࡗ࡝ࡃࡉࠨޕ‬ว㒖ኂ⃻⽎ࠍ⺞ߴࠆߚ߼‫ޔ‬19F + 209Bi ෻ᔕߦ߅ߌࠆᩭⲢวᢿ㕙Ⓧߩബ⿠㑐ᢙࠍ᡼኿ൻᴺߢ᳞߼ߚ‫ޕ‬‫ޣ‬ታ㛎‫ޤ‬ේሶജᯏ᭴࠲ࡦ࠺ࡓടㅦེᾖ኿ࠦ࡯ࠬߦߡ‫ޔ‬83-135 MeV 19F ࡆ࡯ࡓࠍ⌀ⓨ⫳⌕ᴺߢ↢ᚑߒߚ 150-220 Pg/cm2 ෘߩ 209Bi ㊄ዻ⭯⤑࠲࡯ࠥ࠶࠻ߦ 30 ಽ߆ࠄ 8 ᤨ㑆ᾖ኿ߒߚ‫ޕ‬ᩭಽⵚ↢ᚑ‛ࠍ᝝㓸ߒߚࠕ࡞ࡒ▗ߣ⭯⤑࠲࡯ࠥ࠶࠻ࠍ᷹ቯ⹜ᢱߣߒ‫ޔ‬ǫ✢ࠬࡍࠢ࠻࡞ࡔ࠻࡝࡯ߦࠃ
ߞߡ↢ᚑᩭ⒳ࠍหቯߒ‫ޔ‬ቯ㊂ߒߚ‫ޕ‬90 MeV એਅߩ౉኿ࠛࡀ࡞ࠡ࡯ߢᾖ኿ߒߚ⹜ᢱߦߟ޿ߡߪ‫ޔ‬ࡕ࡝ࡉ࠺ࡦࠍൻቇಽ㔌ߒߡᩭಽⵚ↢ᚑ‛ 99Mo ߩ↢ᚑ㊂ࠍቯ㊂ߒߚ‫ޕ‬ൻቇ෼₸㧔49-80%㧕ߪ‫ޔ‬ේሶജᯏ᭴ JRR-3 ᳇ㅍ▤ࠍ↪޿ߚਛᕈሶ᡼኿ൻᴺߦࠃߞߡ᳞߼ߚ‫ޕ‬

ബ⿠㑐ᢙ
ෳ⠨ᢥ₂
[1] C. L. Jiang et al., Phys. Rev. Lett. 89 (2002) 052701-1-4.
[2] A. M. Samant et al., Eur. Phys. J. A 7 (2000) 59-64.
[3] B. B. Back et al, Phys. Rev. C 32 (1985) 195-213.
[4] T. Ichikawa et al., Phys. Rev. C 75 (2007) 064612-1-4.

Study of sub-barrier fusion hindrance in 19F + 209Bi reaction
NISHINAKA, I., KASAMATSU, Y., TANIKAWA, M., GOTO, S., ASAI, M.
− 128 −Mo (mb)99

Cross section of

Fission cross section (mb)‫⚿ޣ‬ᨐߣ⠨ኤ‫ޤ‬99Mo ߩ↢ᚑᢿ㕙Ⓧߣᩭಽⵚᢿ㕙Ⓧߩബ⿠㑐ᢙࠍ࿑㧔㤥ਣߣ㤥྾ⷺ㧕ߦ␜ߔ‫ޕ‬ᩭಽⵚᢿ㕙Ⓧ㧔0.08-650 mb㧕ߪ‫ޔ‬99Mo ߩ↢ᚑᢿ㕙Ⓧࠍోᩭಽⵚߦኻߔࠆ⋧ኻ෼₸ߢⷙᩰൻߒ
ߡ᳞߼ߚ‫⋧ޕ‬ኻ෼₸ߪ 90 MeV ࠃࠅᄢ߈޿౉኿ࠛࡀ࡞ࠡ࡯ߢߩᩭಽⵚ↢ᚑ‛ߩ⾰㊂෼₸ᦛ✢߆ࠄ߽ߣ߼ߚ‫ޕ‬ඨዉ૕ᬌ಴ེࠍ↪޿ߡ᷹ቯߒߚᢥ₂୯㧔⊕ਣ㧕[2]ࠃࠅ߽⚂㧞ᩴዊߐ޿ᩭಽⵚ
ᢿ㕙Ⓧ߹ߢ᷹ቯߔࠆߎߣ߇ߢ߈ߚ‫ߩߎޕ‬෻ᔕ♽ߢߪⶄวᩭ߇ᩭಽⵚߖߕߦᱷ⇐ᩭࠍᒻᚑߔࠆ
⏕₸ߪᭂ߼ߡዊߐ޿‫ߡߞ߇ߚߒޕ‬ᩭಽⵚᢿ㕙ⓍࠍⲢวᢿ㕙Ⓧߣ⷗஖ߔߎߣ߇ߢ߈ࠆ‫ޕ‬౉኿ࠛࡀ࡞ࠡ࡯86 MeV એਅߢߪ‫Ⲣޔ‬วᢿ㕙
10000Ⓧߪ৻ᰴరߩⲢว㓚ოㅘㆊࡕ࠺࡞[3]ߦࠃ
100
1000
ࠆ੍᷹୯㧔ታ✢㧕ࠃࠅ߽ዊߐߊߥࠆ௑ะࠍ
10100␜ߒߚ‫ޔߪ࡯ࠡ࡞ࡀࠛߩߎޕ‬ේሶᩭߩ⾰㊂1
10౏ᑼ߆ࠄ੍᷹ߐࠇࠆ࠲࡯ࠥ࠶࠻ᩭߣ౉኿ᩭ
0.1
ߣ߇ធߒߚ㈩⟎ߢߩࡐ࠹ࡦࠪࡖ࡞ࠛࡀ࡞ࠡ
1
0.01
࡯VKNS = 86.8 MeV [4]ߣࠃߊ৻⥌ߒߚ‫ޕ‬
VKNS
0.1
0.001
⻠Ṷߢߪ‫⚿ޔ‬ว࠴ࡖࡦࡀ࡞⸘▚ߥߤߩࡕ࠺
0.01
80
90
100
110
120
࡞⸘▚߿‫ߩઁޔ‬෻ᔕ♽ߢߩታ㛎࠺࡯࠲ߣߩElab (MeV)Ყセࠍⴕ޿‫Ⲣޔ‬ว㒖ኂ⃻⽎ߩᯏ᭴ߦߟ޿ߡ
99⠨ኤߔࠆ‫ޕ‬࿑ Mo ߩ↢ᚑᢿ㕙Ⓧߣᩭಽⵚᢿ㕙Ⓧߩ

− 129 −"# ┤⤖ᆺ࢞ࢫࢪ࢙ࢵࢺᦙ㏦ࢩࢫࢸ࣒࡟ࡼࡿ㉸㔜ඖ⣲໬Ꮫᐇ㦂ᑐ㇟᰾✀



"0

ࡢ〇㐀

⌮◊ோ⛉ࢭ㸪㜰኱㝔⌮ 㸪ཎᏊຊᶵᵓඛ➃ᇶ♏◊✲ࢭ‫⩚ۑ‬ሙᏹග㸪኱Ụ୍ᘯ 㸪኱㛵࿴㈗㸪➟ᯇⰋᓫ㸪ຍ἞኱ဢ㸪ᕤ⸨♸⏕㸪ᑠ᳃᭷ᕼᏊ 㸪బ⸨ ᮃ 㸪⠛ཎ ཌ 㸪᳃⏣ᾈ௓㸪᳃ᮏᖾྖ㸪⡿⏣ ᫭ $   ,   ,

,1+0/ (#࠙ࡣࡌࡵ࡟ࠚ ᡃࠎࡢࢢ࣮ࣝࣉ࡛ࡣ㸪⌮◊㔜࢖࢜ࣥࣜࢽ࢔ࢵࢡ᪋タ㸦"㸧࡟᪤タࡢẼయ඘ሸᆺ཯㊴᰾ศ㞳⿦⨨㸦"#㸧ࡢ↔Ⅼ㠃࡟࢞ࢫࢪ࢙ࢵࢺᦙ㏦⿦⨨ࢆタ⨨ࡋ㸪≀⌮ⓗ࡟๓ẁศ㞳ࡉࢀࡓ㉸㔜ඖ⣲㸦ཎᏊ␒ྕ ZӍ  㸧ࢆᾮయࢡ࣐ࣟࢺࢢࣛࣇࡸ࢞ࢫࢡ࣐ࣟࢺࢢࣛࣇ࡞࡝ࡢ໬
Ꮫศᯒ⿦⨨࡟ᑟධࡍࡿ᪂ࡋ࠸໬Ꮫศᯒࢩࢫࢸ࣒ࡢ㛤Ⓨࢆ㐍ࡵ࡚࠸ࡿ㸬ࡇࢀࡲ࡛㸪ࡑࢀࡒࢀ
$6 : n㸪 !, : n࡞ࡽࡧ࡟ % / n཯ᛂ࡟ࡼࡗ࡚⏕ᡂࡍࡿ :㸪 6㸪 8ࢆ⏝࠸࡚㸪"# ┤⤖ᆺ࢞ࢫࢪ࢙ࢵࢺᦙ㏦⿦⨨ࡢ㛤Ⓨ◊✲ࢆ⾜ࡗ࡚ࡁࡓ)  *㸬௒ᅇ㸪኱ཱྀᚄࡢ࢞ࢫࢪ࢙ࢵࢺࢳࣕࣥࣂ࣮࡜ᅇ㌿ᘧ 6 ᶆⓗࢆ᪂ࡓ࡟㛤Ⓨࡋ㸪 6   n཯ᛂ࡟ࡼࡗ࡚⏕ᡂࡍࡿ  ␒ඖ⣲ "0 ࡢ໬Ꮫᐇ㦂ᑐ㇟᰾✀  "0 ࢆ໬Ꮫᐇ㦂ᐊࡲ࡛ᘬࡁฟࡍࡇ࡜࡟ᡂຌࡋࡓ) *㸬࠙ᐇ㦂ࠚ"# ࡢ↔Ⅼ㠃࡟࢞ࢫࢪ࢙ࢵࢺࢳࣕࣥࣂ࣮㸦 66 66㸧ࢆタ⨨ࡋ㸪㛤ཱྀ⋡ࡢࢧ࣏࣮ࢺࢢࣜࢵࢻ࡛ᨭᣢࡋࡓཌࡉ  ȝ6 ࡢ࣐࢖࣮ࣛ⟩ࢆ⏝࠸࡚୧⪅ࢆ௙ษࡗࡓ㸬"࡛ຍ㏿ࡉࢀࡓ  ࢖࢜ࣥ㸦  /&㸪 9ȝ㸧ࢆ $3 ⟩㸦61-6 㸧࡟㟁╔ࡋࡓ 6
ᶆⓗ
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㸦 ȝ1 -6 㸧࡟↷ᑕࡋ㸪 6  n཯ᛂ࡟ࡼࡗ࡚ "0㸦༙ῶᮇ ;㸧ࢆྜᡂࡋࡓ㸬"#㸦/ ࢞ࢫᅽ !+㸪☢Ẽ๛ᛶ  $6㸧࡟ࡼࡗ࡚㉁㔞ศ㞳ࡋࡓ  "0 ࢆ࢞ࢫࢪ࢙ࢵࢺࢳࣕࣥࣂ࣮ෆ࡛ / ࢞ࢫ୰࡟ᤕ⋓ࡋ㸪5 ࢚࢔ࣟࢰࣝ࡜࡜ࡶ࡟໬Ꮫᐇ㦂ᐊ࡟ᦙ㏦ࡋ㸪ᅇ㌿ᘧ Į ⥺㐃⥆ ᐃ⿦⨨㸦 㸧ࢆ⏝࠸࡚ Į ⥺ࢫ࣌ࢡࢺ࣓ࣟࢺ࣮ࣜࢆ⾜ࡗࡓ㸬࠙⤖ᯝ࡜⪃ᐹࠚ 31 ࡟㸪  ࡛ ᐃࡉࢀࡓ
"0 ࡢ Į ⥺ࢫ࣌ࢡࢺࣝࢆ♧ࡍ㸬ከ᰾Ꮚ⛣⾜཯ᛂ࡞࡝࡛⏕ᡂࡍࡿ኱㔞ࡢ๪཯ᛂ⏕ᡂ≀ࡣ "# ࡟ࡼࡗ࡚ศ㞳㝖ཤࡉࢀ㸪┠ⓗࡢ  "0 ࡜ࡑࡢፉ᰾✀8㸦 ;㸧ࢆᴟపࣂࢵࢡࢢࣛ࢘ࣥࢻୗ࡛ィ ࡍࡿࡇ࡜ࡀ࡛ࡁࡓ㸬/& ࡢࣆ࣮ࢡࡣ㸪ኳ↛ᨺᑕᛶ᰾✀ "7 ࡢፉ !8 ࡢ Į ⥺࡛࠶ࡿ㸬 "0 ࡢ࢞ࢫࢪ࢙ࢵࢺຠ⋡ࡣ㸪↔Ⅼ㠃 #3 ᳨ฟჾࢆ⏝࠸ࡓูࡢᐇ㦂ࡢ⤖ᯝ࡜ẚ㍑ࡋ࡚ồࡵ㸪 ? ࡛࠶ࡗ
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Fig.
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1*
,$
Į-.0'!)#/-#!0. *#/1.#" '+ 0&#7,) *ࢆ௬ᐃࡋ࡚㸪 66 ࡢ↔Ⅼ㠃࡟ᑐࡋ࡚/#2#+0,-"#0#!0,./,$$,./$0#. /nat? ࡛࠶ࡗࡓ㸬ウㄽ఍࡛ࡣ㸪 / xn (: #.,/,) !,))#!0',+ &# #* ",/# ,$  5  3/࡞ࡽࡧ࡟ nat.  xn 0 ཯ᛂࢆ⏝࠸࡚⾜ࡗࡓ "0 !!1*1)0#"&##$),3.0#3/*'+ +"0&#!&* #. -.#//1.# 3/  ( &# 0#*-#.01.# ,$ࡢ㍍࠸ྠ᪘ඖ⣲ࡢ〇㐀ᐇ㦂࡟ࡘ࠸࡚ࡶሗ࿌ࡍࡿ㸬 0&#)#.,/,)%#+#.0,.3/ ,࠙ཧ⪃ᩥ⊩ࠚ
) *+,+et al.=-5"+.38-2/6#-38  
) *+,+et al.=-5"+.38-2/6#-39  
) *+,+et al.2/6/<<38  
) *'+1+6/et al.=-5"+.38-2/6#-33   !:8.=-<38780  "008:-2/63-+5;<=.3/;=;371<2/1+;4/<<:+7;98:<;>;</6-8=95/.<8"#   (  #$#% '   % % '   " ' #$  # " "$ " $ ' 
− 130 −

3B10

Cf ᶆⓗࢆ⏝࠸ࡓ㛗ᑑ࿨ Fm, Es ࢺ࣮ࣞࢧ࣮ࡢ〇㐀࡜᰾ศග
ཎᏊຊᶵᵓ࣭ඛ➃ᇶ♏ࢭ ࠊ⌮◊࣭ோ⛉ࢭ 㸧‫ۑ‬ὸ஭㞞ே ࠊሯ⏣࿴᫂ ࠊ➟ᯇⰋᓫ ࠊబ⸨ဴஓ ࠊ㇏ᔱཌྐ ࠊỌ┠ㅍ୍㑻 ࠙ࡣࡌࡵ࡟ࠚ 㔜࢔ࢡࢳࣀ࢖ࢻࡢ໬Ꮫⓗᛶ㉁ࢆㄪ࡭ࡿ㝿ࠊ࣐ࢡࣟ㔞ࡢヨᩱࢆධᡭ࡛ࡁ࡞࠸ࡇ࡜
ࡣ኱ࡁ࡞ᐇ㦂ⓗไ⣙࡛࠶ࡿࠋࡑࡢࡓࡵከࡃࡢᐇ㦂ࡣࢺ࣮ࣞࢧ࣮㔞ࡢヨᩱࢆ⏝࠸࡚⾜ࢃࢀࡿࡀࠊ
Cm ࡼࡾࡶ㔜࠸ඖ⣲࡛ࡣࢺ࣮ࣞࢧ࣮㔞ࡢධᡭࡍࡽ㞴ࡋ࠸ࠋFm ࡢࢺ࣮ࣞࢧ࣮ࡣࠊ㔜࢖࢜ࣥຍ㏿ჾࢆ⏝࠸ࡿࡇ࡜࡛౛࠼ࡤ 238U(16O,4n)250Fm ཯ᛂ࡟ࡼࡗ࡚ྜᡂྍ⬟࡛࠶ࡿࠋࡋ࠿ࡋ 250Fm ࡢ༙ῶᮇࡣ 30 ศ࡛⏕ᡂ㔞ࡶᑡ࡞ࡃࠊୟࡘȘ⥺ ᐃ࡛ࡋ࠿ほ ࡛ࡁ࡞࠸ࡢ࡛౑࠸຾ᡭࡣᝏ࠸ࠋᮏ◊✲࡛ࡣࠊ༙ῶᮇ 1 ᪥௨ୖ࡛Ț⥺ ᐃ࡟ࡼࡗ࡚ほ ྍ⬟࡞ Fm ཬࡧ Es ྠ఩యࢆ㔜࢖࢜ࣥ᰾཯ᛂ࡟
ࡼࡗ࡚ẚ㍑ⓗ኱㔞࡟ྜᡂࡍࡿࡇ࡜࡟ᡂຌࡋࡓࡢ࡛ሗ࿌ࡍࡿࠋ
࠙ᐇ㦂ࠚ Fm, Es ྠ఩యࡣࠊCf ᶆⓗ࡟ 12C ࣅ࣮࣒ࢆ↷ᑕࡋ࡚ྜᡂࡋࡓࠋ┤ᚄ 1.4 mmࠊཌࡉ 420
Pg/cm2 ࡢ Cf ᶆⓗ㸦ྠ఩యẚ㸸63% 249Cf, 12% 250Cf, 25% 251Cf㸧ࢆసᡂࡋࠊཎᏊຊᶵᵓࢱࣥࢹ࣒
ຍ㏿ჾࢆ⏝࠸࡚⣙ 600 pnA ࡢ 12C ࣅ࣮࣒㸦71 MeV㸧ࢆࣆ࣏ࣥ࢖ࣥࢺ࡟↷ᑕࡋࡓࠋᶆⓗ࠿ࡽ཯㊴⬺ฟࡋࡓ⏕ᡂ᰾ࢆ He/KCl ࢞ࢫࢪ࢙ࢵࢺἲ࡟ࡼࡾᐇ㦂ᐊࡲ࡛ᦙ㏦ࡋࠊ⏕ᡂ᰾ࡢ௜╔ࡋࡓ KCl
ᚤ⢏Ꮚࢆⷧ⭷ୖ࡟ᤕ㞟ࡋࡓࠋᤕ㞟ࡋࡓ KCl ࡣ୍ᐃ᫬㛫ẖ࡟ 0.1 M ◪㓟࡟࡚⁐ゎ࣭ᅇ཰ࡋࠊィ
3 ᪥㛫ࡢ↷ᑕᚋ◪㓟࣓ࢱࣀ࣮ࣝ⣔ࡢ㝜࢖࢜ࣥ஺᥮ศ㞳ἲ࡟ࡼࡾࠊFm ཬࡧ Es ࢆ KCl ࡸ௚ࡢ᰾཯ᛂ⏕ᡂ≀ࠊ཯㊴࡟ࡼࡗ࡚㣕ࡧฟࡋࡓᶆⓗ≀㉁㸦Cf㸧࠿ࡽศ㞳ࡋࠊࢧ࣐࣒ࣜ࢘ඹỿἲ࡟ࡼࡾ
⥺※ࢆసᡂࡋࡓࠋ
࠙⤖ᯝࠚ Fig. 1 ࡟໬Ꮫศ㞳ࡋ࡚ᚓࡽࢀࡓ Fm, Es ⥺※ࡢȚ⥺ࢫ࣌ࢡࢺࣝࢆ♧ࡍࠋFm ཬࡧ Es ࡢEC ᔂቯ࡟ࡼࡗ࡚ᨺฟࡉࢀࡓ Es ཬࡧ Cf ࡢ≉ᛶ X ⥺ࡀ㠀ᖖ࡟ᙉࡃほ ࡉࢀ࡚࠸ࡿࠋX ⥺ᙉᗘࡢ᫬㛫ῶ⾶㸦Fig. 2㸧࠿ࡽࠊ୺࡞⏕ᡂ᰾ࡣ 253Fm㸦༙ῶᮇ 3 ᪥㸧࡜ 251Es㸦༙ῶᮇ 33 ᫬㛫㸧࡛࠶ࡿࡇ࡜ࡀุࡗࡓࠋ2 ᫬㛫ࡢ ᐃ࡛ 1 ୓࢝࢘ࣥࢺ௨ୖࡢ Es KD1X ⥺ࡀほ ࡉࢀ࡚࠾ࡾࠊᕤኵḟ➨࡛Fm ཬࡧ Es ࢆᑐ㇟࡟ࡋࡓᵝࠎ࡞໬Ꮫᐇ㦂ࡀྍ⬟࡛࠶ࡿࠋࡲࡓࠊȘ⥺ ᐃ࡟࠾࠸࡚ࡶ 100 Bq ⛬ᗘࡢ 252Fm㸦༙ῶᮇ 25 ᫬㛫㸧ࡸ 10 Bq ⛬ᗘࡢ 253Es㸦༙ῶᮇ 20 ᪥㸧ࡀほ ࡉࢀࡓࠋ௒ᅇࡢ↷ᑕᐇ㦂ࡣࠊඖࠎࡣ 259Rf㸦༙ῶᮇ 3 ⛊㸧ࡢȘ-Ț᰾ศගᐇ㦂ࡀ┠ⓗ࡛࠶ࡾࠊ↷ᑕᚋࡢ໬Ꮫศ㞳ࡶ 253Fm ࡢȘ-Ț᰾ศගᐇ㦂ࢆ┠ⓗ࡜ࡋࡓࡶࡢ࡛ࠊ௒ᅇࡢᡂᯝࡣࡑࡢ๪⏘≀࡜ࡋ࡚ᚓࡽࢀࡓࠋㅮ₇࡛ࡣඖࠎࡢ┠ⓗ࡛࠶ࡿ᰾ศගᐇ㦂ࡢ⤖ᯝ࡟ࡘ࠸࡚ࡶሗ࿌ࡍࡿࠋ
Cf,Es L X

10 3

Cf,Es K D X

250

Cf,Es K E X
272.3 Fm
+ 44
271.1 Sc

10

10

1

Cf KD1 X
T 1/2 = 33.40(6) h5.20(5) h

10 1
0

Es

Counts / sCounts10177.5 251 Cf

251

10 0

0

12

With chemical separation
2532

249-251

Cf + C
Irradiation time: 2.9 d
17Beam dose: 9.3 x 10 p

8.50(7) h100
200Energy (keV)

300

Fm

Es

Es KD1 X
T 1/2 = 3.068(10) d

0

251

253

Fm

50
100
150
Time from the End of Bombardment (h)200Fig. 1: Gamma-ray spectrum of the Fm and Es

Fig. 2: Decay curves of Es and Cf KD1X rays intracer measured for 2 h after 4.5-d cooling.

the Fm and Es tracer.

Production of long-lived Fm and Es tracers using a Cf target and its application to nuclear spectroscopy
ASAI, M., TSUKADA, K., KASAMATSU, Y., SATO, T.K., TOYOSHIMA, A., NAGAME, Y.
− 131 −

− 132 −3B12

*U ߩวᚑ෸߮፣უ․ᕈߩ⎇ⓥ

ේሶജᯏ᭴వ┵ၮ␆⎇ⓥ࠮ ‫ޔ‬ℂ⎇ੳ⑼࠮ ‫ޔ‬੩ᄢၮ␆‛ℂ⎇ ‫᧲ޔ‬ᄢේሶᩭ⑼ቇ⎇ⓥ࠮ ‫╳ޔ‬ᵄᄢ ‫᧲ޔ‬੩ℂ⑼ᄢ ‫ޔ‬ၯ₹ᄢ  ٤૒⮮ᦸ ‫ޔ‬ടᴦᄢ຦ ‫ޔ‬᫪ᧄᐘม ‫ޔ‬⠀႐ብశ ‫ޔ‬ᏒᎹ㓉ᢅ ‫ޔ‬੗ᚻญᩕᴦ ‫ޔ‬ዊᶆኡਯ ‫ޔ‬Ꮏ⮮␭↢ ‫ޔ‬ዊᴛ㗼 ‫ޔ‬ᄢ㑐๺⾆ ‫ޔ‬૑↰⾆ਯ ‫ޔ‬ጊญ⾆ਯ ‫ޔ ᤩ↰☨ޔ‬ศ↰ᢕ ‫ޔ‬᫪↰ᶈ੺ ‫ޤߦ߼ߓߪޣ‬ේሶᩭ߇㐽Ზࠍᒻᚑߔࠆߎߣߢ቟ቯߥᕈ⾰ࠍ␜ߔ㓁ሶ߿ਛᕈሶߩᢙߪ㝷ᴺᢙߣ
๭߫ࠇߡ߅ࠅ‫⃻ޔ‬࿷ߪᦨᄢߩ㝷ᴺᢙߣߒߡ㓁ሶᢙ Z = 82‫ޔ‬ਛᕈሶᢙ N = 126 ߇⍮ࠄࠇߡ޿ࠆ‫ޕ‬߹ߚ‫ޔ‬ᰴߩ㝷ᴺᢙߪ‫ޔ‬ℂ⺰⊛ߦߪ Z = 114‫ޔ‬120 ╬߿ N = 184 ߢ޽ࠆߣ੍ᗐߐࠇߡ޿ࠆ‫ࠇߎޕ‬ࠄߩේሶᩭߪ⃿ᒻߣ੍ᗐߐࠇߡ޿ࠆ߇‫⿥ޔ‬㊀ᩭ㗔ၞߩ Z = 108‫ޔ‬N = 152‫ޔ‬162 ߦߪ‫ޔ‬ේሶᩭ߇ᄌᒻߒߡ޿ࠆߦ߽߆߆ࠊࠄߕ‫ߩઁޔ‬ᩭߦᲧߴߡǩ፣უࠛࡀ࡞ࠡ࡯߇ዊߐ޿ߣ޿߁቟ቯߥᕈ⾰ࠍᜬߟේሶᩭ߇ሽ࿷ߔࠆߎߣ߇ᦨㄭߩታ㛎ߦࠃߞߡ᣿ࠄ߆ߦߥߞߚ‫ޔߦ․ޕ‬ᄌᒻੑ㊀㝷ᴺᩭߩ 270Hs㧔Z = 108‫ޔ‬N = 162㧕߿ߘߩ๟࿐ߩᩭߪ⹦ߒ޿ᕈ⾰߇⎇ⓥߐࠇߡ޿ࠆ[1]‫ޔߒ߆ߒޕ‬ਛᕈሶߩዋߥ޿ Hs ห૏૕ߪ‫↢ޔ‬ᚑߐࠇߚ୘ᢙ߇ዋߥ޿ߎߣ߽޽ࠅ‫ߩߘޔ‬ᕈ⾰ߪ޽߹ࠅ⍮ࠄࠇߡ޿ߥ޿‫ޔߢߎߘޕ‬ℂൻቇ⎇ⓥᚲߦ߅޿ߡ 263,264,265Hs ߩวᚑታ㛎ࠍⴕ޿‫ߩࠄࠇߘޔ‬፣უ․ᕈࠍ
⎇ⓥߒߚ‫ޕ‬ ᧄ⻠Ṷߢߪ 264,265Hs ߩᕈ⾰ߦߟ޿ߡㅀߴࠆ‫ޕ‬263Hs ߦ㑐ߒߡߪ‫ޔ‬ടᴦ᳁߇⻠Ṷ⇟ภ 3B11 ߦߡ⻠Ṷ੍ቯߢ޽ࠆ[2]‫ޕ‬‫ޣ‬ታ㛎‫ޤ‬ℂ⎇✢ᒻടㅦེ RILAC ࠍ↪޿ߡ 208Pb(58Fe, xn) [x = 1,2]෸߮ 207Pb(58Fe, n) ෻ᔕߦࠃࠅ
264,265
Hs ࠍวᚑߒ‫ޔ‬᳇૕లႯဳ෻〡ಽ㔌ⵝ⟎ GARIS ߦࠃߞߡᩭⲢว↢ᚑ‛ࠍಽ㔌࡮෼㓸ߒ‫ޔ‬GARIS ߩὶὐ㕙ߦ⸳⟎ߐࠇߚ૏⟎ᬌ಴ဳࠪ࡝ࠦࡦᬌ಴ེߦࠗࡦࡊ࡜ࡦ࠻ߒߚ‫ⷰߢߎߘޕ‬᷹ߐࠇߚǩ✢߿⥄⊒ᩭಽⵚࠗࡌࡦ࠻ߦࠃࠅ‫ޔ‬፣უ․ᕈࠍ⎇ⓥߒߚ‫ޕ‬‫⚿ޣ‬ᨐ࡮⠨ኤ‫ޤ‬208Pb(58Fe, n)265Hs ෻ᔕߢߪ‫ޔ‬ᢿ㕙Ⓧߩᦨᄢ୯ߣߒߡ(51+46-29) pb ߇ᓧࠄࠇߚ‫ߎޕ‬ߩᤨߩ౉኿ࠛࡀ࡞ࠡ࡯ߪᮡ⊛ߩਛᔃߢ 220.5 MeV ߢ޽ࠅ‫ޔ‬౉኿♽ߦ Audi ࠄ[3]‫ⶄޔ‬วᩭߦ Myersand Swiatecki ߩ⾰㊂౏ᑼ[4]ࠍㆡ↪ߒߡ᳞߼ߚⶄวᩭߩബ⿠ࠛࡀ࡞ࠡ࡯ߪ⚂ 15 MeV ߦߥࠆ‫ޕ‬ߎࠇߪ‫ޔ‬ㆊ෰ߦℂ⎇ߢⴕࠊࠇߚ Pb ෸߮ Bi ᮡ⊛ࠍ↪޿ߚ⿥㊀ᩭวᚑߩ෻ᔕᢿ㕙Ⓧ߇ᦨᄢߣߥ
ࠆࠛࡀ࡞ࠡ࡯ߩ♽⛔ᕈࠍᡰᜬߔࠆ⚿ᨐߢ޽ࠆ[5]‫ޔߚ߹ޕ‬ᄌᒻ㝷ᴺᢙ N = 152 ߳ߩࠕࡊࡠ࡯࠴
264ߣߒߡ‫ޔ‬
Hs ߩ፣უ․ᕈߦ㑐ߔࠆ⛔⸘ࠍะ਄ߐߖࠆߎߣ߇ߢ߈ߚ‫ޕ‬ߘߩ⚿ᨐࠍ࿑ 1 ߦ␜ߔ‫ޕ‬‫ޣ‬ෳ⠨ᢥ₂‫ޤ‬[1] J. Dvorak et al., Phys. Rev. Lett. 100, 132503 (2008)[2] D. Kaji et al., J. Phys. Soc. Jap. 78, 035003 (2009)[3] G. Audi et al., Nucl. Phys. A 729, 337 (2003)[4]W. D. Myers and W. J. Swiatecki, Nucl. Phys. A 601, 141 (1996)[5]K. Morita, ᣣᧄ‛ℂቇળ⹹ 60, 698 (2005)
࿑ 1㧦264Hs ߩ፣უㅪ㎮‫ޕ‬Production and decay properties of 264,265Hs
SATO, N., KAJI, D., MORIMOTO, K., HABA, H., ICHIKAWA, T., IDEGUCHI, E., KOURA, H.,
KUDOU, Y., OZAWA, A., OZEKI, K., SUMITA, T., YAMAGUCHI, T., YONEDA, A., YOSHIDA, A.,
MORITA, K.
− 133 −

3B13

248

Cm+23Na ߦࠃࠆ 266Bh ߩ↢ᚑߣ፣უ․ᕈ

ℂ⎇ੳ⑼࠮ ‫ޔ‬ේሶജᯏ᭴వ┵ၮ␆⎇ⓥ࠮ ‫ޔ‬੩ᄢၮ␆‛ℂ⎇ ‫ޔ‬ጊᒻᄢቇ ‫ޔ‬ᣂẟᄢቇ ‫᧲ޔ‬ᄢේሶᩭ⑼ቇ⎇ⓥ࠮ ‫ޔ‬ᄢ㒋ᄢቇ ‫╳ޔ‬ᵄᄢ ‫ޔ‬ၯ₹ᄢ  ٤᫪ᧄᐘม 1, ᫪↰ᶈ੺ 1, ടᴦᄢ຦ 1, ⠀႐ብశ 1, ᄢ㑐๺⾆ 1, Ꮏ⮮␭↢ 1, ૒⮮ᦸ 12, ૑↰
⾆ਯ 1㧘☨↰ᤩ 1, ᏒᎹ㓉ᢅ 13, ⮮᫪ᐽਯ 4, ᓟ⮮⌀৻ 5,੗ᚻญᩕᴦ 6, ═᧻⦟ፏ 1, 㣮ข⾫ᴦ 1, ዊ᫪᦭Ꮧሶ 7, ዊᶆኡਯ 2, Ꮏ⮮ਭᤘ 5, ᄢᳯ৻ᒄ 7, ዊᴛ㗼 8, 㐷ฟ౻᮸ 4,Ⴆ↰๺᣿ 2, ጊญ⾆ਯ 9, ศ↰ᢕ 1‫ޔߦߢ߹ࠇߎޤߦ߼ߓߪޣ‬ℂ⎇᳇૕లႯဳ෻〡ᩭಽ㔌ⵝ⟎㧔GARIS㧕ࠍ↪޿ 209Bi(70Zn,n)278113
෻ᔕߦࠃࠆ 2 ଀ߩᣂర⚛ 278113 ߩ↢ᚑ߇ႎ๔ߐࠇߡ޿ࠆ[1,2]‫ߩߘޕ‬፣უㅪ㎮ߪᣢ⍮ᩭߢ޽ࠆ
266

Bh ߣߘߩᆷᩭߢ޽ࠆ 262Db ߦ೔㆐ߒߡ޿ࠆ߇‫ޔ‬266Bh ߩႎ๔଀ߪਲߒ޿[3,4]‫ޕ‬278113 ߩ፣უㅪ㎮ߣᣢ⍮ᩭߣߩߟߥ߇ࠅࠍࠃࠅ⏕ታߦߔࠆߚ߼ߦ‫ޔ‬GARIS ࠍ↪޿ߡ 248Cm(23Na,5n)266Bh ෻ᔕߦࠃࠆ 266Bh ߩ↢ᚑࠍ⹜ߺߘߩ፣უ․ᕈߩ⎇ⓥࠍⴕߞߚ‫ޕ‬‫ޣ‬ታ㛎‫ޤ‬ℂ⎇ RILAC ߆ࠄଏ⛎ߐࠇࠆ 126, 130 ߅ࠃ߮ 132MeV ߩ 23Na ࡆ࡯ࡓࠍ‫⋥ޔ‬ᓘ 10cm ߩ࿁ォᑼ 248Cm ࠲࡯ࠥ࠶࠻ߦᾖ኿ߒ 248Cm(23Na,5n)266Bh ෻ᔕߦࠃࠆ 266Bh ↢ᚑࠍ⹜ߺߚ‫⊒⫳ޕ‬ᱷ⇐ᩭߪ‫ࠬࠟޔ‬లႯဳ෻〡ᩭಽ㔌ⵝ⟎ GARIS ߢಽ㔌ߐࠇ‫ޔ‬ὶὐ㕙ߦ⸳⟎ߒߚࠪ࡝ࠦࡦᬌ಴ེ▫
ߦᛂߜㄟߺ᷹ⷰࠍⴕߞߚ‫ࡓ࡯ࡆޕ‬ᾖ኿ਛߪ⸘ᢙ₸߇㜞޿ߚ߼‫ ߪࡓ࡯ࡆޔ‬3 ⑽ ON ߘߩᓟ 3 ⑽OFF ࠍ➅ࠅ㄰ߒ‫⸘ޔ‬ᢙ₸ߩૐ޿ OFF ᦼ㑆ਛߦ 266Bh ߣᕁࠊࠇࠆ፣უ߇᷹ⷰߦ߆߆ߞߚ႐วߦ
ߪߐࠄߦࡆ࡯ࡓࠍ 100 ⑽ OFF ߦߒߡା㗬ᐲߩ㜞޿፣უㅪ㎮ߩ᷹ⷰࠍⴕߞߚ‫ޕ‬‫⚿ޣ‬ᨐ࡮⠨ኤ‫ޤ‬248
Cm+23Na ෻ᔕߦࠃࠅ‫ޔ‬ว⸘ 32 ߩ፣უㅪ㎮ࠍ᷹ⷰߒߚ‫ޔߜ߁ߩߘޕ‬14 ፣უㅪ㎮ߪ᣿⏕ߦ 266Bh߆ࠄߩ፣უㅪ㎮ߢ޽ࠆߣ⚿⺰ߒ‫ޔ‬10 ፣უㅪ㎮ࠍ 266Bh ߆ࠄߩ፣უㅪ㎮ߩน⢻ᕈ߇㜞޿ㅪ㎮ߢ޽ࠆߣ⚿⺰ߒߚ‫ޕ‬ᱷࠅߩ፣უㅪ㎮ߪ‫ޔ‬267Bh ߆ࠄߩ፣უㅪ㎮߅ࠃ߮หቯਇ⢻ߥ፣უㅪ㎮ߣߒߚ‫ޕ‬᷹ⷰߐࠇߚ 266Bh ߆ࠄߩǩ✢ߩࠛࡀ࡞ࠡ࡯ߪ 9.05 ߆ࠄ 9.23MeV ߦಽᏓߒߡ߅ࠅ‫ޔ‬ᆷᩭߢ޽ࠆ
262
Db ߪႎ๔ߐࠇߡ޿ࠆඨᷫᦼߣ⍦⋫ήߊǩ፣უ߅ࠃ߮⥄⊒ᩭಽⵚߔࠆ੐߇⏕⹺ߐࠇߚ[5]‫ߎޕ‬ࠇࠄߩ⚿ᨐߪ‫ޔ‬೨ㅀߩᣂర⚛ 278113 ߩ፣უㅪ㎮ਛߦ᷹ⷰߐࠇߡ޿ࠆ 266Bh ߅ࠃ߮ 262Db ߩ᷹ⷰ⚿ᨐࠍㅊ⹺ߔࠆ߽ߩߣߥߞߚ‫ޕ‬‫ޣ‬ෳ⠨ᢥ₂‫ޤ‬[1] K. Morita et al., J. Phys. Soc. Jan. 73, 2593 (2004)[2] K. Morita et al., J. Phys. Soc. Jan. 76, 045001 (2007)[3] P. A. Wilk et al., Phys. Rev. Lett. 85, 2967 (2000)[4] Z. Qin et al., Nucl. Phys. Rev. 23, 400 (2006)[5]K. Morita et al., J. Phys. Soc. Jpn. 78,064201 (2009)

Production and Decay Properties of 266Bh and its daughter nuclei
MORIMOTO, K., MORITA, K., KAJI, D., HABA, H., OZEKI, K., KUDOU, Y., SATO, N., SUMITA, T.,
YONEDA, A., ICHIKAWA, T., FUJIMORI, Y., GOTO, S., IDEGUCHI, E., KASAMATSU, Y.,
KATORI, K., KOMORI, Y., KOURA, H., KUDO, H., OOE, K., OZAWA, A., TOKANAI, F.,
TSUKADA, K., YAMAGUCHI, T., YOSHIDA, A.
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