ఋ᬴ܱឪเƷFallout
Cs 137 䠄༙ῶᮇ30.2ᖺ䠅
Cs-137䠄༙ῶᮇ30 2ᖺ䠅⟃Ἴ኱Ꮫ䜰䜲䝋䝖䞊䝥⎔ቃືែ◊✲䝉䞁䝍䞊㉳※䠖1950䠉1960ᖺ௦䛻⾜䜟䜜䛯᰾ᐇ㦂㻲㼍㼘㼘㼛㼡㼠㻌㻾㼑㼏㼛㼞㼐㻝㻢㻜㻜㻝㻞㻜㻜㻮㼝㻛㻛㼙㼊㻞⚟ᓥཎⓎ஦ᨾ⏤᮶䛾ᨺᑕᛶ᰾✀䛾⛣⾜ㄪᰝ䠖䝕䝕䞊䝍䛛䜙ㄞ䜏ྲྀ䜜䜛⛣⾜䛾ᐇែ䛸௒ᚋㄞែᚋ㻤㻜㻜㻠㻜㻜㻜㻝㻥㻡㻤 㻝㻥㻢㻟 㻝㻥㻢㻤 㻝㻥㻣㻟 㻝㻥㻣㻤 㻝㻥㻤㻟 㻝㻥㻤㻤 㻝㻥㻥㻟ᜠ ⿱ᜠ⏣⿱୍Walling (2003) modified䛚䜘䛭ྜィ7kBq/m2

Cs-137⃰ᗘ (Bq kg-1)

ᅵተ䛾῝䛥 (ccm)

06
5100

200

300

0
10611 Bq m -2
3.7 t ha-1 y -1

2030461128 Bq m -2
2 9 t ha-1 y -1
2.9㔜せ䛺䝫䜲䞁䝖

52071 Bq m -2
1.4 t ha-1 y -1

321 䛒䜛ᆅᇦ䛾⵳✚㔞䜢⾲䛩ሙྜ䛿䠈

41586 Bq m -2
2.1 t ha-1 y -1

 ẝỦ‫؏ע‬ỉᔛᆢ᣽ửᘙẴ‫ئ‬ӳỊύẮẼỤẝỦ‫؏ע‬ỉᔛᆢ᣽ửᘙẴ‫ئ‬ӳỊ ẮẼỤ䠄⵳✚㔞䠗inventory) 䚹3

1666 Bq m -2

Bq/m2

22.0 t ha-1 y -1
2784 Bq m -2
ᶆ㧗 (m)

10.3 t ha-1 y -1

ࢭࢩ࣒࢘ࡢ῝ᗘศᕸ࡜౵㣗ᅵ◁㔞ࡢᖹ㠃ศᕸ 䛒䜛≀㉁䛾⃰ᗘ䜢▱䜚䛯䛔ሙྜBq/kg ⃰ᗘ (concentration)ขࡇЎࠋầẝỦỉỂύ੔ӕขẰỆợẾềẟẦợạỆ
ờ‫٭‬ỪụộẴ

Fukuyama, T., Onda, Y., Takenaka, C., and Walling. D.E. (2008) Journal ofGeophysical Research, Earth Surface 113, F02007, doi:10.1029/2006JF000657.

䝇䜽䝺 䝟 䝥䝺䜲䝖䝇䜽䝺䞊䝟䞊䝥䝺䜲䝖㻝ᕝಛ⏫ㄪᰝ⤖ᯝಛᯝ
1cm䜎䛷64%2cm䜎䛷87%5cm䜎䛷98%

༙ῶᮇ30ᖺ

1cm䜎䛷64%2cm䜎䛷87%1cm䜎䛷54%2cm䜎䛷79%5cm䜎䛷98%5cm䜎䛷100%

༙ῶᮇ2ᖺ
༙ῶᮇ
ᖺ

༙ῶᮇ8᪥
༙ῶᮇ

5cm䜎䛷䝃䞁䝥䝸䞁䜾䛩䜜䜀䜋䜌䛩䜉䛶䛾⵳✚㔞䠄inventory)

Kato, H., et al., Depth distribution of 137Cs, 134Cs, and 131I in soil profile after
Fukushima Daiichi Nuclear Power Plant Accident, Journal of Environmental
Radioactivity (2011), doi:10.1016/j.jenvrad.2011.10.003

㻞ᩥ㒊⛉Ꮫ┬ᨺᑕ⥺㔞➼ศᕸ 䝑䝥ᣑ኱䝃䜲䝖ᩥ㒊⛉Ꮫ┬ᨺᑕ⥺㔞➼ศᕸ䝬䝑䝥ᣑ኱䝃䜲䝖
http://ramap.jaea.go.jp/map/㻟࿢‫ؾ‬ɶưƷᆆᘍᆆᘍᢅᆉỉʖยỉẺỜỉؕᄽἙὊἑὉ᧙̞ࡸᵊᴾἴἙἽᄂᆮỉẺỜỉИ஖͌ὉἣἻἳὊἑử੩̓‫̛ٓם‬᫢Ệểờễạ્‫ࣱݧ‬ఋᆔỉ‫ם‬ٓͨ૾ᆆѣỉ‫ܭ‬᣽҄ᮾᕤ኱䞉Ⲉᇛ኱䞉Ẽ㇟◊ౕ௎ẦỤ‫ٓם‬ồỉ્‫ࣱݧ‬ఋᆔỉᆆᘍỉܱ७ᚐଢ્‫ࣱݧ‬ཋឋửԃớ‫ࣇٓם‬ቩ‫܇‬ỉࠇẨɥậỉย‫ܭ‬2013ᖺ䠏᭶1᪥බ㛤⟃Ἴ኱⟃Ἴ኱ἯὊἑἨἽἄἽἰἝỸἲ౨Ј֥Ệ᣼‫ٳ‬Ểỉఋᆔ᣽ย‫ܭ‬ʻࢸỉ્‫ࣱݧ‬ཋឋỉᆆѣỉʖยᵟᶇᶐᵋᵠᶍᶐᶌᶃᴾἍὅἇὊఄദỆМဇ⟃Ἴ኱䞉ᮾᕤ኱⟃Ἴ኱ᮾ ኱ᵡᶑᵋᵏᵑᵒᵊᵏᵑᵕᵊᴾᵧᵋᵏᵑᵏ્‫ࣱݧ‬ఋᆔỉ‫נ܍‬᣽ύɦ૾ේᡢỉܱ७৭੮Ẽ㇟◊‫ٓם‬ẦỤඕ߷ύฯකύඕ߷ẦỤෙබồỉ્‫ࣱݧ‬ఋᆔ᝟ᒵ᣽ỉምЈᵡᶑᵋᵏᵑᵒᵊᵏᵑᵕ⟃Ἴ኱䞉ᗈᓥ኱ http://www.jaea.go.jp/fukushima/kankyoanzen/
http://www jaea go jp/fukushima/kankyoanzen/Ẽ㇟◊⟃Ἴ኱䞉ᗈᓥ኱ி㒔኱13൦ỉ્‫ࣱݧ‬ఋᆔỉឬ᭗ችࡇย‫ܭ‬්Ј‫ם‬ჿὉ්Ј൦ỉย‫ܭ‬ἋἁἾὊἣὊἩἾὊἚỆợỦᵓᶋᶋ᧓ᨠỂỉఋᆔ‫נ܍‬᣽ย‫ܭ‬

mapping_report/2nd-japanese/2ndlist.html

http://fmwse.suiri.tsukuba.ac.jp/ౕ௎ౕ௎ưƷఋᆔЎࠋཞ७ȷᆆᘍᢅᆉƷᚐௌఋᆔЎࠋཞ७ ᆆᘍᢅᆉ ᚐௌ䖃᳃ᯘ䛛䜙ᅵተ䜈䛾ᨺᑕᛶ᰾✀䛾⛣⾜䛾ᐇែ䜢ゎ᫂䛩䜛䚹᳃ᯘ䝍䝽䞊䛻䛚䛡䜛䝫䞊䝍䝤䝹䝀䝹䝬䝙䜴䝮᳨ฟჾ䜢⏝䛔䛯ᨺᑕ⬟ ᐃᯘᗋ㠃䝰䝙䝍䝸䞁䜾ᶞᖿὶ䚸ᯘෆ㞵䚸䝸䝍䞊䛾ィ16ᗈⴥᶞ䝇䜼ኊ㱋ᯘ䝇䜼ⱝ㱋ᯘᅵተỈ䛾᥇Ỉ

http://fmwse.suiri.tsukuba.ac.jp/㻠⣼ຍ⵳✚㔞ຍ⵳✚㔞㻡್䛾ኚ໬ 䝸䝍䞊䜢ྵ䜐䝸䝍 䜢ྵ䜐㻢ᅵተ౵㣗䛻క䛖ᨺᑕᛶ᰾✀䛾⛣⾜㻣Ἑᕝ䜈䛾⛣⾜Ἑᕝ䜈䛾⛣⾜ ἙᕝỈ୰䜈䛾

Cs-137䛾⛣⾜㻤ᕝᗏᅵ ẚ⾲㠃✚䛸ᨺᑕᛶྠ఩య⃰ᗘ䛾㛵ಀᕝᗏᅵ䠖ẚ⾲㠃✚䛸ᨺᑕᛶྠ఩య⃰ᗘ䛾㛵ಀᅵተ୰䛾Cs-137⃰ᗘ䛿䠈ẚ⾲㠃✚䛾0.65஌䛻ẚ౛

He and Walling (1996) Journal of Environmental Radioactivity, Vol. 30, pp. 117-137.

ἍἉỸἲỊኬቩễ‫ٓם‬ቩ‫܇‬ỆԈბẰủởẴẟᕝᗏᅵ䠖ൔ᠋ƷƨǊ ƸᲦ્‫ࣱݧ‬ӷˮ˳ຜࡇƷቩࡇᙀ ƕ࣏ᙲൔ᠋ƷƨǊƴƸᲦ્‫ࣱݧ‬ӷˮ˳ຜࡇƷቩࡇᙀദƕ࣏ᙲ䕿䝉䝅䜴䝮䛿⣽⢏䛺ᅵተ⢏Ꮚ䛻྾╔䛥䜜䜔䛩䛔䠄ẚ⾲㠃✚䛜኱䛝䛔䛯䜑䠅䕿ᇶ‽⢏ᗘ䜢Ỵᐃ䛧䠈⢏ᗘ⤌ᡂ䛾㐪䛔䛻䜘䜛ᨺᑕᛶྠ఩య⃰ᗘ䜈䛾ᙳ㡪䜢⿵ṇ䠄ᐇ㝿䛻䛿 䜒 䛸ᕪ䛜኱䛝䛟䛺䜚䜎䛩䠅䠄ᐇ㝿䛻䛿䠈䜒䛳䛸ᕪ䛜኱䛝䛟䛺䜚䜎䛩䠅ᅵ◁ࡢᨺᑕᛶྠ఩య⃰ᗘ§·Enrichment Ratio ¨¸© ౪⤥※ᅵተࡢᨺᑕᛶྠ఩య⃰ᗘ ¹
䠄He and Walling (1996) 䜢ᨵኚ䠅䕔ሁ✚ᅵ◁䛾⢏ᗘ⿵ṇಀᩘP’䛾ồ䜑᪉§S ·P ' ¨¨ ds ¸¸© S ms ¹⣽⢏⢏Ꮚ䛜㞟✚䛩䜛䛸Cs-137⃰ᗘ䛜㣕㌍ⓗ䛻ୖ䛜䜛䠄ሙྜ䛻䜘䛳䛶䛿100ಸ௨ୖ䠅䛔䜟䜖䜛䇾䝬䜲䜽䝻䝩䝑䝖䝇䝫䝑䝖䠛䇿䛾ᙧᡂ㧗⃰ᗘ䛾䝉䝅䜴䝮(Bq/kg)䛜᳨ฟ䛥䜜䛯䛣䛸䛻䜘䛳䛶䠈䇾㧗⃰ᗘởᰁᆅᇦ䇾䛸䛔䛖䛾䛿㛫㐪䛳䛯ゎ㔘䚹v䛣䛣䛷䠈Sds䠗ሁ✚ᅵ◁䛾ẚ⾲㠃✚ (m2/g)
Sms䠗㐠ᦙ䛥䜜䜛ᅵ◁䛾ẚ⾲㠃✚ (m2/g)v䠗ᨺᑕᛶ᰾✀䛾ᅵተ⢏Ꮚ䜈䛾྾╔≉ᛶ䜢䛒䜙䜟䛩ᐃᩘ
䠄137Cs䛿0.65䠗䜲䜼䝸䝇䠈䝕䝪䞁䛾ᅵተ䛾ሙྜ䠅㻥㻝㻜

Cs-1377⃰ᗘ䠄ᕝᗏ
ᗏᅵ䞉⏕䝕䞊䝍
䝍䠅 Bq/kg⢏ᗘ⿵ṇ䜢䛩䜛䛸ἙᕝỈ䛾Cs137⃰ᗘ䛸ᗏ㉁䛾Cs-137⃰ᗘ䛾㛫䛻Ⰻ䛔┦㛵䟿

y = 6834x + 1008.3
R² = 0.8294

16000
14000
12000
10000
8000
6000
4000
2000
000.5

1

1.5

22.5

Cs-137⃰ᗘ䠄ἙᕝỈ䠅 Bq/L
Cs--137⃰ᗘ䠄ᕝᕝᗏᅵ䞉⢏ᚄ
ᚄ⿵ṇ䠅Bq/kggἙᕝỈCs-137⃰ᗘ䛸
ᗏ㉁䛾Cs 137⃰ᗘ䛾㛵ಀ
ᗏ㉁䛾Cs-137⃰ᗘ䛾㛵ಀ
(1ᅇ┠᥇ྲྀ䠅16000
y = 7740.7x - 928.79
R² = 0.883

14000
12000
10000
8000
6000
4000
2000
000.5

11.5

2Cs-137⃰ᗘ䠄ἙᕝỈ䠅 Bq/L2.5⎔ቃ┬ἙᗏᅵㄪᰝᆅⅬ㻝㻝㔜せ䛺䝫䜲䞁䝖Ỉ⏣䝥䝻䝑䝖 䛒䜛ᆅᇦ䛾⵳✚㔞䜢⾲䛩ሙྜ䛿䠈

Bq/m2

Plot Sita ẝỦ‫؏ע‬ỉᔛᆢ᣽ửᘙẴ‫ئ‬ӳỊύؕஜႎỆẮẼẝỦ‫؏ע‬ỉᔛᆢ᣽ửᘙẴ‫ئ‬ӳỊ ؕஜႎỆẮẼỤ䠄⵳✚㔞䠗inventory) 䚹᤼Ỉ㊰% P 䛒䜛≀㉁䛾⃰ᗘ䜢▱䜚䛯䛔ሙྜ

Bq/kgỈ⏣ճ ⃰ᗘ (concentration)ขࡇЎࠋầẝỦขࡇЎࠋầẝỦỉỂύ੔ӕขẰỆợẾềẟẦợạỆ੔ӕขẰ ợẦợạờ‫٭‬ỪụộẴỈ⏣༊ศࡅSita
43㽢17mScraping soil
surfaceN
Normall cultivation
lti tiUe
30㽢17mỈ⏣༊ศࡅᅵ◁⨨ሙⲨᆅྲྀỈỈ㊰% PྲྀỈỈ㊰㐨㊰road
46ほᮇ㛫Observation
periodSoil
puddling
period㻞㻜㻝㻝㻛㻢㻛㻝㻟㻢㻛㻝㻠㻙㻢㻛㻞㻜㻢㻛㻞㻝㻙㻣㻛㻟㻣㻛㻠㻣㻛㻡㻙㻣㻛㻝㻡㻣㻛㻝㻢㻙㻣㻛㻞㻞㻣㻛㻝㻢㻣㻛㻞㻞㻣㻛㻞㻟㻙㻣㻛㻟㻝㻤㻛㻝㻙㻤㻛㻢㻤㻛㻣㻙㻤㻛㻥㻤㻛㻝㻜㻙㻤㻛㻝㻤㻤㻛㻝㻥㻤㻛㻞㻜 㻤㻛㻞㻥㻤㻛㻞㻜㻙㻤㻛㻞㻥ᮇ㛫ྜィTotal㏻ᖖ⪔సNormalcultivation㻯㼟㻙㻝㻟㻣㻯㼟㻙㻝㻟㻠㻔㻮㼝㻕㻔㻮㼝㻕㻢㻞㻥㻤㻢㻟㻢㻜㻢㻢㻠㻡㻣㻢㻣㻣㻟㻜㻞㻢㻞㻥㻞㻟㻟㻜㻥㻡㻞㻣㻢㻝㻟㻢㻝㻝㻠㻟㻝㻤㻟㻢㻙㻙㻝㻠㻝㻡㻥㻝㻝㻥㻟㻟㻟㻠㻢㻣㻞㻥㻡㻝㻠㻝㻡㻟㻠㻤㻝㻝㻜㻜㻜㻜㻜㻜㻢㻥㻟㻥㻡㻟㻢㻢㻟㻥㻟㻤

intake⾲㠃䛿䛞䛸䜚
Surfacesoil scraped off㻯㼟㻙㻝㻟㻣㻯㼟㻙㻝㻟㻠㻔㻮㼝㻕㻔㻮㼝㻕㻞㻠㻤㻠㻟㻝㻥㻝㻣㻡㻟㻠㻥㻟㻡㻞㻢㻥㻣㻤㻢㻤㻥㻜㻡㻡㻜㻢㻥㻟㻙㻙㻙㻙㻜㻜㻞㻥㻞㻣㻞㻡㻣㻟㻝㻤㻝㻣㻡㻤㻞㻟㻡㻝㻞㻢㻜㻜㻜㻜㻟㻠㻞㻝㻞㻞㻤㻜㻝㻤㻝㻣㻝㻢㻢㻟㻝㻟㻞㻡㻤㻜47㻝㻞ᾋ㐟◁୰䛾ᨺᑕᛶ䝉䝅䜴䝮䛾ᖹᆒ⃰ᗘ䜋䛸䜣䛹䛜ᾋ㐟◁䛸䛧䛶ᾏ䛻ὶฟ䠗2011ᖺ䠖ᇶ‽್䛾10ಸ௨ୖ㻝㻟㻝㻠