― 36 ―
㻌䠄䠒䠅㻌 㻮㻺㻯㼀 䛾䛯䜑䛾 㻟 ḟඖ䝀䝹⥺㔞ィ䛾ᨺᑕᙳ㡪䛾᳨ウ㻌
㻌 ᗈᓥᅜ㝿Ꮫಖ་⒪Ꮫ㒊㻌 ᯘៅ୍㑻㻌 㻌 ி㒔ᏛཎᏊ⅔ᐇ㦂ᡤ㻌 ḈⰋ᠇㻌 㻌 ி㒔ᏛᏛ㝔ᕤᏛ◊✲⛉㻌 ෆ⏣Ⰻᖹ㻌 㻌 ㏆␥ᏛཎᏊຊ◊✲ᡤ㻌 ⱝᯘ※୍㑻㻌 㻌
㻝㻚㻌 ⫼ᬒ䞉┠ⓗ㻌
ி㒔ᏛཎᏊ⅔ᐇ㦂ᡤ䛷䛿୰ᛶᏊ䜢⏝䛧䛯ᨺᑕ⥺⒪ἲ䛾୍✀䛷䛒䜛䠈䝩䜴⣲୰ᛶᏊᤕᤊ⒪
ἲ㻔㻮㻺㻯㼀㻦㻌㻮㼛㼞㼛㼚㻌㻺㼑㼡㼠㼞㼛㼚㻌㻯㼍㼜㼠㼡㼞㼑㻌㼀㼔㼑㼞㼍㼜㼥㻕䛾⮫ᗋ◊✲䛜⾜䜟䜜䛶䛔䜛䚹䝩䜴⣲䛾Ᏻᐃྠయ䛷䛒䜛 㻮㻙㻝㻜䛿୰ᛶᏊ྾᩿㠃✚䛜䛝䛟䠈⇕୰ᛶᏊ䛸䛾㻮㻙㻝㻜㻔㼚㻘䃐㻕㻸㼕㻙㻣ᛂ䛻䜘䜚䜰䝹䝣䜯⢏Ꮚ䛸䝸䝏䜴䝮ཎ Ꮚ᰾䜢⏕ᡂ䛩䜛䚹䛣䜜䜙䛾㔜Ⲵ㟁⢏Ꮚ䛾⏕య⤌⧊୰䛷䛾㣕⛬䛿㻝㻜㻌 䃛㼙௨ୗ䛷䛒䜚䠈⣽⬊䠍䛴䛸ྠ⛬
ᗘ䛷䛒䜛䛯䜑䠈⭘⒆⣽⬊䛾㑅ᢥⓗ䛺◚ቯ䛜ᮇᚅ䛷䛝䜛䚹῝㒊⭘⒆䛻ᑐ䛩䜛㻮㻺㻯㼀䛷䛿䠈䛻㻌 㼗㼑㼂㻌 㡿 ᇦ䛾䜶䝛䝹䜼䞊䜢䜒䛴⇕እ୰ᛶᏊ䜢⏝䛔䜛䚹↷ᑕ䛥䜜䛯⇕እ୰ᛶᏊ䛿䠈䝍䞊䝀䝑䝖䛻䜘䜛ᙎᛶᩓ䛻 䜘䛳䛶ῶ㏿䛥䜜䠈⭘⒆῝䛥䛷⇕㡿ᇦ䛾䜶䝛䝹䜼䞊䛸䛺䜛䚹䛣䛾䜘䛖䛻㻮㻺㻯㼀䛻䛚䛔䛶䛿୰ᛶᏊ䛾ᩓ
ᛂ䜢⏝䛩䜛䛯䜑䠈୰ᛶᏊ᮰ศᕸ䛺䜙䜃䛻⥺㔞ศᕸ䛿䝍䞊䝀䝑䝖䛾ᙧ≧䛚䜘䜃ᑍἲ䛻౫Ꮡ䛩䜛䚹䛭䛾 䛯䜑䠈㻟ḟඖ䝀䝹⥺㔞ィ䛻䜘䜛⏕య➼౯䛺ᙧ≧䛚䜘䜃ᑍἲ䛻䛚䛡䜛⥺㔞ศᕸ䛾᳨ド䛜ᮇᚅ䛥䜜䛶䛔 䜛䚹㻌
㻮㻺㻯㼀↷ᑕሙ䛻䛚䛔䛶䠈୰ᛶᏊ䝇䝨䜽䝖䝹䛿⨨䛻䜘䛳䛶ኚ䛧䠈䝍䞊䝀䝑䝖᰾✀䛸䛾┦స⏝䛻䜘 䜚ᵝ䚻䛺⢏Ꮚ䛜⏕ᡂ䛥䜜䜛䚹䝀䝹⥺㔞ィ䛾⢏Ꮚ⥺⒪䜈䛾ᛂ⏝䛻㛵䛩䜛◊✲䛻䛚䛔䛶䠈䝫䝸䝬䞊䝀 䝹⥺㔞ィ䛻䛿⥺㉁౫Ꮡᛶ䛜䛒䜛䛣䛸䛜ሗ࿌䛥䜜䛶䛚䜚㼇㻝㼉䠈⥺㔞ィ䛾ᛂ⟅ศᕸ䛛䜙⥺㔞ศᕸ䜢┤᥋ホ ౯䛩䜛䛣䛸䛜䛷䛝䛺䛔䚹ᮏ◊✲䛷䛿ி㒔ᏛཎᏊ⅔ᐇ㦂ᡤ䛻䛚䛡䜛㻝㻹㼃↷ᑕ䛻ඛ❧䛳䛶䠈㏆␥Ꮫ ཎᏊຊ◊✲ᡤ䛾㼁㼀㻾㻙㻷㻵㻺㻷㻵䜢⏝䛔䛶䠈䝫䝸䝬䞊䝀䝹⥺㔞ィ䜢㻮㻺㻯㼀䛻䛚䛡䜛྾⥺㔞 ᐃ䛻ᛂ⏝䛩 䜛䛯䜑䠈୰ᛶᏊ↷ᑕሙ䛻䛚䛡䜛⥺㉁౫Ꮡᛶ䜢ホ౯䛧䛯䚹㻌
㻌
㻞㻚㻌 ᪉ἲ㻌
ᮏ◊✲䛷䛿䠈䝫䝸䝬䞊䝀䝹⥺㔞ィ䛸䛧䛶ឤᗘ䛾㧗䛔㻹㻭㻳㻭㼀䠈୰ᛶᏊ⥺㔞䜢ቑ䛩䜛䛯䜑䛻䝸䝏䜴 䝮䛾ῧຍ䜢᳨ウ䛧䛯䚹䝸䝏䜴䝮䛾Ᏻᐃྠయ䛷䛒䜛㻸㼕㻙㻢䛿䠈㻸㼕㻙㻢㻔㼚㻘䃐㻕㻴㻙㻟ᛂ䛻䜘䛳䛶୰ᛶᏊ⥺㔞䜢 ቑ䛩䜛䛣䛸䛜䛷䛝䠈䜎䛯䠈㻮㻙㻝㻜䛸ẚ㍑䛧䛶㻞ḟ䜺䞁䝬⥺䛾ᨺฟ䛜↓䛔䛸䛔䛖≉ᚩ䛜䛒䜛䚹ᶆ‽ⓗ䛺 㻹㻭㻳㻭㼀䠄Ỉ㻤㻣㼣㼠㻑䠈䝯䝍䜽䝸䝹㓟㻡㼣㼠㻑䠈䝊䝷䝏䞁㻤㼣㼠㻑䛚䜘䜃㻞㻌㼙㻹㻌㼀㻴㻼㻯䠅䛻㻞㻡㻌㼙㻹䛚䜘䜃㻡㻜㻌㼙㻹䛾◲㓟 䝸䝏䜴䝮䜢ῧຍ䛧䛯⥺㔞ィ䜢సᡂ䛧䠈▼ⱥヨ㦂⟶䠄㻣㻌 㼙㻸䠅䛻ᑒධ䛧䛯䚹ຍ䛘䛶䠈↓ᶵሷ䛾ῧຍ䛻䜘䜛䝫䝸 䝬䞊䝀䝹⥺㔞ィ䛾ឤᗘୖ᪼㼇㻞㼉䛸୰ᛶᏊ⥺㔞䛾ቑ䛾ຠᯝ䜢ᘚู䛩䜛䛯䜑䠈⃰⦰䝸䝏䜴䝮䠄㻥㻢㻑㻌 㻸㼕㻙㻢䠅 䜢ྵ䜐◲㓟䝸䝏䜴䝮䜢ྠ㔞ῧຍ䛧䛯⥺㔞ィ䜢సᡂ䛧ẚ㍑䛧䛯䚹◲㓟䝸䝏䜴䝮ῧຍ䛻䜘䜛ឤᗘኚ䛾ホ ౯䛾䛯䜑䠈ி㒔ᏛཎᏊ⅔ᐇ㦂ᡤ䝁䝞䝹䝖㻢㻜䜺䞁䝬⥺↷ᑕ⨨䜢⏝䛔䛶䜺䞁䝬⥺䛻ᑐ䛩䜛⥺㔞ᛂ⟅
䜢 ᐃ䛧䛯䚹୰ᛶᏊ䛾↷ᑕ䛿䠈㏆␥ᏛཎᏊຊ◊✲ᡤ䛾ᩍ⫱⏝ཎᏊ⅔䠄㼁㼀㻾㻙㻷㻵㻺㻷㻵䠅୰ኸ䝇䝖䝸䞁䜺 䞊䛻䛶⾜䛳䛯䚹⥺㔞ィ䜢䜰䝹䝭〇䝣䝺䞊䝮䛻ᅛᐃ䛧䠈ฟຊ㻝㻌 㼃㐠㌿䛻㻞䛚䜘䜃㻠㛫䛾↷ᑕ䜢⾜䛳䛯䚹 㻹㻾㻵 ᐃ䛻䛿ᗈᓥᅜ㝿Ꮫ䛾㻜㻚㻟㻌 㼀㻌 㻹㻾㻵䝇䜻䝱䝘䠄㻭㻵㻾㻵㻿㻌 㻵㻵䠅䜢⏝䛔䠈㻞㻜䠈㻡㻜䠈㻥㻜䛚䜘䜃㻝㻠㻜㻌 㼙㼟䛾㻠䜶䝁 䞊㛫䛻䛚䛡䜛 ᐃ䛛䜙ᶓ⦆⋡䜢ホ౯䛧䛯䚹⥺㔞ィ⟬䛻䛿㻹㻯㻺㻼㻢㻚㻝䛺䜙䜃䛻㻼㻴㻵㼀㻿㻞㻚㻤㻤䜢⏝䛔䛯䚹 㻹㻯㻺㻼䜢⏝䛔䛶⮫⏺≧ែ䛻䛚䛔䛶⥺㔞ィ䛻ධᑕ䛩䜛୰ᛶᏊ䛚䜘䜃ගᏊ⥺᮰䜢ィ⟬䛧䠈䛭䛾୰ᛶᏊ䛚 䜘䜃ගᏊ䜢⥺※䛸䛧䛶⏕ᡂ䛥䜜䜛Ⲵ㟁⢏Ꮚ䛾䜶䝛䝹䜼䞊䜢㻼㻴㻵㼀㻿䛻䜘䛳䛶ィ⟬䛧䛯䚹㻌
― 37 ― 㻌
㻟㻚㻌 ⤖ᯝ䞉⪃ᐹ㻌
䝁䝞䝹䝖㻢㻜䜺䞁䝬⥺䜢⏝䛔䛯⥺㔞ᛂ⟅ ᐃ䛻䛚䛔䛶䠈ᅇ⏝䛔䛯◲㓟䝸䝏䜴䝮⃰ᗘ䛷䛿᭷ព䛺ឤ ᗘୖ᪼䛿ㄆ䜑䜙䜜䛺䛛䛳䛯䚹䛧䛯䛜䛳䛶䠈䝸䝏䜴䝮ῧຍ䛻䜘䜛ᛂ⟅䛾ኚ䛿䠈䛻㻸㼕㻙㻢䛾㻔㼚㻘䃐㻕ᛂ䛻 䜘䜛䜒䛾䛷䛒䜛䛸⪃䛘䜛䛣䛸䛜䛷䛝䜛䚹୰ᛶᏊ↷ᑕᐇ㦂䛻䜘䜚ᚓ䜙䜜䛯䠈ᶆ‽⤌ᡂ䠄㻿㼠㼍㼚㼐㼍㼞㼐䠅䠈㻞㻡䛚䜘䜃 㻡㻜㻌 㼙㻹ኳ↛◲㓟䝸䝏䜴䝮ῧຍ䠄㻺㼍㼠㻞㻡㼙㻹䠈㻡㻜㼙㻹䠅䛺䜙䜃䛻㻞㻡䛚䜘䜃㻡㻜㻌 㼙㻹⃰⦰◲㓟䝸䝏䜴䝮ῧຍ 䠄㻱㼚㻞㻡㼙㻹䠈㻡㻜㼙㻹䠅㻹㻭㻳㻭㼀⥺㔞ィ䛾⥺㔞ᛂ⟅䜢㻲㼕㼓㻚㻌 㻝䛻♧䛩䚹ᅗ䜘䜚⥺㔞ィ୰䛻Ꮡᅾ䛩䜛㻸㼕㻙㻢䛜ከ䛟 䛺䜛䛻䛴䜜䛶䠈༢⥺㔞䛒䛯䜚䛾ᛂ⟅䛜ᑠ䛥䛟䛺䜛䛣䛸䛜☜ㄆ䛷䛝䜛䚹ᶆ‽⤌ᡂ䛾㻹㻭㻳㻭㼀䛷䛿䠈䛻
㊴㝧Ꮚ䛸㻺㻙㻝㻠䛾㻔㼚㻘㼜㻕ᛂ䛛䜙ᡂ䜛㝧Ꮚ⥺㔞ᡂศ䛜䛚䜘䛭㻠㻜㻑䛷䛒䜛䛾䛻ᑐ䛧䠈㻡㻜㻌 㼙㻹䛾⃰⦰◲㓟䝸 䝏䜴䝮䜢ຍ䛘䛯ሙྜ䠈䜰䝹䝣䜯⢏Ꮚ䛚䜘䜃୕㔜㝧Ꮚ䛾ᐤ䛻䜘䜚㔜Ⲵ㟁⢏Ꮚ䛻䜘䜛⥺㔞ྜ䛜㻤㻡㻑䜎 䛷䛝䛟䛺䜛䚹⥺㔞ᡂศྜ䛾ኚ䜢ᐃ㔞ⓗ䛻ホ౯䛩䜛䛯䜑䠈⥺㔞ィ୰䛻䛚䛡䜛ᖹᆒ㻸㻱㼀䜢ィ⟬䛧䛯䚹 ឤᗘ䛾ኚ䛴䛔䛶䛿䝁䝞䝹䝖㻢㻜䜺䞁䝬⥺䛻ᑐ䛩䜛ᛂ⟅䜢ᇶ‽䛸䛧䠈ྠ䛨྾⥺㔞䛻ᑐ䛩䜛ᛂ⟅䛾ẚ 䠄┦ᑐຠ⋡䠅䜢⥺㔞ᛂ⟅䛾ഴ䛝䛛䜙ホ౯䛧䛯䚹ᖹᆒ㻸㻱㼀䛻ᑐ䛧䛶ྛ⥺㔞ィ䛾┦ᑐຠ⋡䜢䝥䝻䝑䝖䛧䛯䜒 䛾䛜㻲㼕㼓㻚㻌 㻞䛷䛒䜛䚹䛣䛾䜘䛖䛻ᐃ㔞ⓗ䛺⥺㉁౫Ꮡᛶホ౯䛻䜘䜚䠈୰ᛶᏊ↷ᑕሙ䛻ᑐ䛧䛶䜒䝫䝸䝬䞊䝀䝹
⥺㔞ィ䛾ᛂ⏝䛜ᮇᚅ䛷䛝䜛䚹㻌
䠄䛣䜜䜙䛾⤖ᯝ䛿ୗグᴗ⦼୍ぴ䛾Ꮫ䛻䛶ཱྀ㢌Ⓨ⾲䛥䜜䛯䠅䚹㻌 㻌
㻌 㻌
ཧ⪃ᩥ⊩㻌
㼇㻝㼉㻌 㻌㼀㻚㻌 㻹㼍㼑㼥㼍㼙㼍㻌 㼑㼠㻌 㼍㼘㻚㻘㻌 㻾㼍㼐㼕㼛㼘㼛㼓㼕㼏㼍㼘㻌 㼏㼔㼍㼞㼍㼏㼠㼑㼞㼕㼟㼠㼕㼏㼟㻌 㼛㼒㻌 㻹㻾㻵㻙㼎㼍㼟㼑㼐㻌 㼂㻵㻼㻌 㼜㼛㼘㼥㼙㼑㼞㻌 㼓㼑㼘㻌 㼡㼚㼐㼑㼞㻌 㼏㼍㼞㼎㼛㼚㻌 㼎㼑㼍㼙㻌㼕㼞㼞㼍㼐㼕㼍㼠㼕㼛㼚㻘㻌㻾㼍㼐㼕㼍㼠㼕㼛㼚㻌㻼㼔㼥㼟㼕㼏㼟㻌㼍㼚㼐㻌㻯㼔㼑㼙㼕㼟㼠㼞㼥㻘㻌㻝㻝㻜㻣㻘㻌㻣㻙㻝㻝㻌㻔㻞㻜㻝㻡㻕㻌
㼇㻞㼉㻌 㻌㻿㻚㻌 㻴㼍㼥㼍㼟㼔㼕㻌 㼑㼠㻌 㼍㼘㻚㻘㻌 㻱㼒㼒㼑㼏㼠㻌 㼛㼒㻌 㼕㼚㼛㼞㼓㼍㼚㼕㼏㻌 㼟㼍㼘㼠㻌 㼛㼚㻌 㼠㼔㼑㻌 㼐㼛㼟㼑㻌 㼟㼑㼚㼟㼕㼠㼕㼢㼕㼠㼥㻌 㼛㼒㻌 㼜㼛㼘㼥㼙㼑㼞㻌 㼓㼑㼘㻌 㼐㼛㼟㼕㼙㼑㼠㼑㼞㻘㻌 㻾㼍㼐㼕㼍㼠㼕㼛㼚㻌㻼㼔㼥㼟㼕㼏㼟㻌㼍㼚㼐㻌㻯㼔㼑㼙㼕㼟㼠㼞㼥㻘㻌㻤㻤㻝㻘㻌㻤㻤㻠㻙㻤㻤㻤㻌㻔㻞㻜㻝㻞㻕㻌
㻌 㻌 㻌 㻌
Fig. 1. Dose-response characteristic for standard and Li-added MAGAT
Fig. 2. LET dependence of relative
efficiency for MAGAT-type polymer
― 38 ― ᴗ
ᴗ⦼୍ぴ㸦㸦ཱྀ㢌Ⓨ⾲㸧
1) ෆ⏣Ⰻᖹ㸪ᯘៅ୍㑻㸪ᕥ㏆ᩔኈ㸪ⱝᯘ※୍㑻㸪⏣୰᠇୍㸪ḈⰋ᠇, “Li ῧຍ࣏࣐࣮ࣜࢤࣝ
⥺㔞ィࡢ୰ᛶᏊ↷ᑕሙ࠾ࡅࡿᛂ⟅≉ᛶ͇, ➨6 ᅇ3ḟඖࢤࣝ⥺㔞ィ◊✲, 2017ᖺ11᭶ 11᪥ࠥ2017ᖺ11᭶12᪥,㸦ᰣᮌ┴࣭ୗ㔝ᕷ㸧㻌
2) R. Uchida, S. Hayashi, A. Sakon, G. Wakabayashi, K. Tanaka and Y. Sakurai, ”Investigation of applicability of polymer gel dosimeters with Li compounds to dosimetry in boron neutron capture therapy”, The 9th Young Researchers' BNCT Meeting, 2017ᖺ11᭶13᪥ࠥ2017ᖺ11᭶15᪥, 㸦ி㒔ᗓ࣭Ᏹᕷ㸧
3) ෆ⏣Ⰻᖹ㸪ᯘៅ୍㑻㸪ḈⰋ᠇㸪⏣୰᠇୍㸪ⱝᯘ※୍㑻, “ࣜࢳ࣒࢘ࢆῧຍࡋࡓ࣏࣐࣮ࣜࢤ
ࣝ⥺㔞ィࡼࡿ୰ᛶᏊ⥺㔞ศᕸ ᐃྥࡅࡓᇶ♏ⓗ᳨ウ͇, ➨ 14 ᅇ᪥ᮏ୰ᛶᏊᤕᤊ⒪ἲᏛ
Ꮫ⾡, 2017ᖺ9᭶29᪥ࠥ2017ᖺ9᭶30᪥,㸦⚟ᓥ┴࣭㒆ᒣᕷ㸧㻌 㻌
㻌 ᐇ
ᐇ㦂䞉 ᐃ⿵ຓ⪅㻌㻌
㻌 㻌 㻌 ෆ⏣Ⰻᖹ㻌 㻌 㻌 㻌 ி㒔ᏛᏛ㝔ᕤᏛ◊✲⛉㻌 㻌 㻌 ༤ኈㄢ⛬ 㻟 ᖺ䠄㻰㻟䠅㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 䠄ィ㻌 㻝㻌 ྡ䠅㻌
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