雑誌名 八戸工業大学エネルギー環境システム研究所紀要

電解濃縮前処理を用いた青森県太平洋沿岸海水のト リチウム濃度測定

著者 山下 惇, 村中 健

著者別名 YAMASHITA Jun, MURANAKA Takeshi

雑誌名 八戸工業大学エネルギー環境システム研究所紀要

巻 9

ページ 9‑14

発行年 2011‑03‑24

URL http://id.nii.ac.jp/1078/00002308/

Creative Commons : 表示 ‑ 非営利 ‑ 改変禁止

̶ 9 ̶

̶ 9 ̶

ࢺࣜࢳ࣒࢘⃰ᗘ ᐃ

ᒣୗ ᝡ

࣭ᮧ୰ ೺

Measurement of Tritium Concentrations in Seawater Collected along the Pacific Coast in Aomori Prefecture after Enrichment by Electrolysis

Jun YAMASHITA

Takeshi MURANAKA

A

The nuclear fuel reprocessing plant is constructed in Rokkasho village in Aomori prefecture and the tritium-contaminated waste are discharged into the atmosphere and the ocean. Then we collected coastal seawater along the Pacific coast in Aomori prefecture and measured tritium concentration after enrichment by electrolysis. The stable hydrogen isotope ratio in the non- enriched water samples and the enriched ones were also measured to calculate tritium concentration before the enrichment. Tritium concentration in the samples collected at Lake Obuchi was gradually lowered from January 2008 to April 2010 except the concentration in the sample collected in January 2009. The tritium concentrations in the samples collected at other three sites were below 0.5 ੯ /L, except the concentration in the samples collected in January 2008 at Misawa fishing port and Shirahama beach. These increased tritium concentrations will be due to the tritium-contaminated waste water discharged from the nuclear fuel processing plant.

Key Words:tritium concentration, seawater, tritium-contaminated waste water

࣮࣮࢟࣡ࢻ㸸ࢺࣜࢳ࣒࢘⃰ᗘ㸪ᾏỈ , ࢺࣜࢳ࣒࡛࢘ởࢀࡓᗫỈ

1. ࡣࡌࡵ࡟

ࢺࣜࢳ࣒࢘ࡣࠊ༙ῶᮇ 12.3 ᖺࡢỈ⣲ࡢᨺᑕᛶྠ

఩య࡛⮬↛⏺࡛ࡣᏱᐂ⥺ࡢᙳ㡪࡟ࡼࡾ኱Ẽᅪୖ

ᒙ࡛Ⓨ⏕ࡋ࡚࠸ࡿࠋࡲࡓࠊேⅭⓗⓎ⏕※࡜ࡋ࡚

ࡣཎᏊຊⓎ㟁ᡤࡸ᰾⇞ᩱ෌ฎ⌮᪋タࠊ᰾ᐇ㦂࡞

࡝ࡀᣲࡆࡽࢀࡿࠋ㟷᳃┴භࣨᡤᮧ࡛ࡣ࢘ࣛࣥ⃰

⦰ᕤሙࠊపࣞ࣋ࣝᨺᑕᛶᗫᲠ≀ᇙタࢭࣥࢱ࣮ࠊ 㧗ࣞ࣋ࣝᨺᑕᛶᗫᲠ≀㈓ⶶ⟶⌮ࢭࣥࢱ࣮ࠊࡑࡋ

࡚෌ฎ⌮ᕤሙࡢ୍㒊࡛࠶ࡿ౑⏝῭ࡳ⇞ᩱཷࡅධ

ࢀ࣭㈓ⶶ᪋タࡀ᧯ᴗࡋࠊᖺ᭶᪥࠿ࡽࡣ෌

ฎ⌮ヨ㦂ࡀ㛤ጞࡉࢀࠊᗄࡘ࠿ࡢᨺᑕᛶ᰾✀ࡀ⎔

ቃ୰࡟ᨺฟࡉࢀ࡚࠸ࡿࠋཎᏊຊ᪋タࡢ࿘㎶ఫẸ

➼ࡢ೺ᗣ࡜Ᏻ඲ࢆᏲࡿࡓࡵࠊཎᏊຊ᪋タ࡟㉳ᅉ ࡍࡿᨺᑕ⬟ཪࡣᨺᑕ⥺ࡢᨺฟ≧ἣࢆㄪ࡭ࡿᚲせ ࡀ࠶ࡾࠊ㟷᳃┴ཎᏊຊࢭࣥࢱ࣮

ࠊ⎔ቃ⛉Ꮫᢏ⾡

◊✲ᡤ

ࡀ኱ẼࠊỈࠊᅵࠊ⏕≀ヨᩱ࡟ࡘ࠸࡚ࣔࢽ ࢱࣜࣥࢢㄪᰝࢆ⾜ࡗ࡚࠸ࡿࠋᡃࠎࡣᾏὒ୰࡟ᨺ ฟࡉࢀࡿỈ⣲ࡢᨺᑕᛶྠ఩య࡛࠶ࡿࢺࣜࢳ࣒࢘

࡟╔┠ࡋࠊඵᡞᕷ࠿ࡽභࣨᡤᮧࡲ࡛ࡢኴᖹὒἢ

ᖹᡂ23ᖺ1᭶14᪥ཷ⌮

͊ ᕤᏛ◊✲⛉ᶵᲔ࣭⏕≀໬ᏛᕤᏛᑓᨷ༤ኈ๓ᮇㄢ⛬࣭2ᖺ

͊͊ ኱Ꮫ㝔ᕤᏛ◊✲⛉ᶵᲔ࣭⏕≀໬ᏛᕤᏛᑓᨷ/ࣂ࢖࢜⎔ቃ ᕤᏛ⛉࣭ᩍᤵ

八戸工業大学エネルギー環境システム研究所紀要 第 9 巻

40㼻15ƍ

140㼻00ƍ 142㼻00ƍ

䐟 䐠 䐢

㟷᳃┴

ኴᖹὒ

30km

㽢 41㼻00ƍ

䐡

ヨᩱỈ䛾᥇ྲྀ

⵨␃᧯స(ῶᅽ⵨␃)

䝖䝸䝏䜴䝮䛾㟁ゎ⃰⦰

⵨␃᧯స(ᖖᅽ⵨␃)

 ᐃ⏝䝞䜲䜰䝹సᡂ

㔜Ỉ⣲⃰ᗘ ᐃ 䝖䝸䝏䜴䝮⃰ᗘ ᐃ

ᾏỈ୰䛾䝖䝸䝏䜴䝮⃰ᗘ⟬ฟ 㟁 ゎ ๓ 㟁 ゎ ᚋ

ᓊᆅᇦ࡟࠾࠸࡚ᾏỈࢆ᥇Ỉࡋ㟁ゎ⃰⦰ฎ⌮ࢆ⏝

࠸࡚ࠊࢺࣜࢳ࣒࢘⃰ᗘࢆ⢭ᗘࡼࡃ ᐃࡋࡓࠋࡑ

ࢀࡽࡢ⤖ᯝ࡟ࡘ࠸࡚ሗ࿌ࡍࡿࠋ

2. ヨᩱ᥇ྲྀ

Fig.1 ࡟Ỉヨᩱ᥇ྲྀᆅⅬࢆ♧ࡍࠋࢺࣜࢳ࣒࢘ࢆྵ

ࡴ᤼ᾮᨺฟᆅⅬࡣࠊභࣨᡤᮧᑿ㥨἟௜㏆ࡢᾏᓊ

࠿ࡽ⣙ 3km ᮾ᪉࡞ࡢ࡛ࠊᾏỈ᥇ྲྀᆅⅬ࡜ࡋ࡚ࡣᨺ ฟᆅⅬࡼࡾ༡ࡢձඵᡞᕷⓑ὾ᾏᓊࠊղ୕ἑ⁺ ࠊ ճᨺฟᆅⅬ࡟㏆࠸ᑿ㥨἟ࠊࡑࡋ࡚ᨺฟᆅⅬࡼࡾ

໭ࡢմἩᾏᓊࡢ 4 ᆅⅬ࡜ࡋࠊ 3L ࡎࡘ᥇ྲྀࡋࡓࠋ

Fig.1 ᥇ྲྀᆅⅬ

ձⓑ὾ᾏᓊ ( ඵᡞᕷ ) ղ୕ἑ⁺  ( ୕ἑᕷ ) ճᑿ㥨἟ ( භࣨᡤᮧ ) մἩᾏᓊ ( භࣨᡤᮧ )

ݳ෌ฎ⌮ᕤሙ ( භࣨᡤᮧ ) ەࢺࣜࢳ࣒࢘ࢆྵࡴ᤼ᾮ ᨺฟᆅⅬ ( ᾏᓊ࠿ࡽ 3 㹩㹫ᆅⅬ )

3.  ᐃ

3.1  ᐃࡢὶࢀ

ヨᩱ᥇ྲྀ࠿ࡽ⃰ᗘ⟬ฟࡲ࡛ࡢὶࢀࢆ Fig.2 ࡟♧

ࡍࠋ

Fig.2  ᐃࡢὶࢀ

᥇ỈࡋࡓỈヨᩱࡣῶᅽ⵨␃ࢆ⾜࠸ሷศ࡞࡝ࡢ

୙⣧≀ࢆྲྀࡾ㝖ࡁࠊ㟁ゎ⃰⦰ࢆ⾜࠸ヨᩱỈ୰ࡢ ࢺࣜࢳ࣒࢘⃰ᗘࢆୖࡆࡿࠋࡑࡢᚋ㟁ゎ⃰⦰᫬࡟

Ⓨ⏕ࡍࡿ୙⣧≀ࢆྲྀࡾ㝖ࡃࡓࡵ࡟ᖖᅽ⵨␃ࢆ⾜

࠺ࠋᖖᅽ⵨␃ࡀ⤊஢ࡋࡓヨᩱỈ࡟ᾮయࢩࣥࢳࣞ

࣮ࢱࢆΰྜࡋ ᐃ⏝ࣂ࢖࢔ࣝࢆసᡂࡋࡓࠋసᡂ ࡋࡓࣂ࢖࢔ࣝࢆᾮయࢩࣥࢳ࣮ࣞࢩࣙࣥ࢝࢘ࣥࢱ

࣮࡟࡚ ᐃࠊ⃰⦰๓ᚋࡢỈヨᩱࡢ㔜Ỉ⣲⃰ᗘࢆ

 ᐃࡋࠊ⃰⦰๓ࡢࢺࣜࢳ࣒࢘⃰ᗘࢆ⟬ฟࡍࡿࠋ

3.2 ῶᅽ⵨␃

᥇Ỉࡋࡓヨᩱࡣ 70mL ࡎࡘࢆ 2 ᅇ ࠊ 1 ヨᩱ࡟ࡘ ࡁ 4 ᫬㛫࡛ῶᅽ⵨␃ࢆ⾜࠸୙⣧≀ࢆྲྀࡾ㝖ࡃࠋ⵨

␃ᚋࡢఏᑟ⋡ࡣ 1 ȣ6FP ௨ୗ࡜࡞ࡿࠋ

3.3 2ẁ㝵㟁ゎ⃰⦰ἲ

୙⣧≀ࢆྲྀࡾ㝖࠸ࡓヨᩱࡣ㟁ゎ⃰⦰ࢆ⾜࠺ࠋ

➨ 1 ẁ㝵࡛ࡣᕷ㈍㟁ゎ⿦⨨ࢺࣜࣆࣗ࢔࣓࣌ࣝࣞ

ࢵࢡ㟁ᴟࢆ⏝࠸࡚ 1000mL ࠿ࡽ 200mL ࡲ࡛ࢆ 50A

୍ᐃ࡛⃰⦰ࢆ⾜࠺ࠋ➨ 2 ẁ㝵࡛ࡣ 200mL ࡢ࠺ࡕ

180mL ࢆ⮬స㟁ゎ⣲Ꮚࢆ⏝࠸ࡓ⿦⨨

࡛ 60mL ࡲ࡛

5A ୍ᐃ࡛⃰⦰ࡍࡿࠋ 2 ẁ㝵⃰⦰࡟ࡼࡾయ✚ῶᐜ⋡

15 ಸࡢ㟁ゎ⃰⦰ࢆ⾜ࡗࡓࠋ

3.4 ࢺࣜࣆࣗ࢔༢య⃰⦰

2009 ᖺ 4 ᭶࡟᥇ྲྀࡋࡓヨᩱࡲ࡛ࡣ኱㟁ὶ㟁ゎ⃰

⦰⿦⨨࡜⮬స㟁ゎ⿦⨨ࢆ⏝࠸ࡓ 2 ẁ㝵⃰⦰ἲࢆ⏝

࠸࡚ࢺࣜࢳ࣒࢘⃰⦰ࢆ⾜ࡗ࡚ࡁࡓࠋࡋ࠿ࡋẁ㝵 㟁ゎ⃰⦰ἲࡣࢺࣜࢳ࣒࢘⃰ᗘ⟬ฟࡲ࡛㠀ᖖ࡟᫬

㛫ࡀ࠿࠿ࡿࠋࡑࡇ࡛᫬㛫ࢆ▷⦰ࡍࡿࡓࡵ࡟ࠊ2009 ᖺ 10 ᭶࡟᥇ྲྀࡋࡓヨᩱ࠿ࡽࢺࣜࣆࣗ࢔༢య⃰⦰࡟

ษࡾ᭰࠼ࡿ஦࡟ࡋࡓࠋ

ࢺࣜࣆࣗ࢔༢య⃰⦰࡛ࡣ᥇ྲྀࡋࡓỈヨᩱࢆ

800mL ࠿ࡽ 200mL ࡲ࡛ 50A ࡛ࠊࡑࡢᚋࠊ 20A ࡛ 80mL ࡲ࡛㟁ゎ⃰⦰ࢆ⾜࠺ࠋࡋࡓࡀࡗ࡚ࠊ 800mL

࠿ࡽ 80mL ࡲ࡛ࡢయ✚ῶᐜ⋡ 10 ಸ⃰⦰ࢆ⾜ࡗࡓࠋ

3.5 ࢺࣜࢳ࣒࢘⃰ᗘ ᐃ

㟁ゎ⃰⦰ࡋࡓヨᩱࡣ୙⣧≀ࢆྲྀࡾ㝖ࡃⅭ࡟ᖖ ᅽ⵨␃ࢆ⾜࠸ࠊࡑࡢᚋࢸࣇࣟࣥࣂ࢖࢔ࣝ࡟⵨␃

ࡋࡓヨᩱỈ 40mL ࡜ࢩࣥࢳ࣮ࣞࢱ࣮ 60mL ࢔ࢡ࢔

̶ 11 ̶

̶ 11 ̶

i

T T

i

f

D

D

f i

i f i i

f f

V V

T T V T

V R T

/ /

˜

˜

> @ ^{1 1000}

/

/ ¸¸ ¹ u

¨¨ ·

©

§

ST SA

H D

H D ͙ D

G

^D

^D

ln T T k ln

ᅇᩘ ⿦⨨ᐃᩘ

㻝ᅇ┠ 㻝㻚㻝㻣㻝

㻞ᅇ┠ 㻝㻚㻝㻤㻡

㻟ᅇ┠ 㻝㻚㻝㻤㻡

㻠ᅇ┠ 㻝㻚㻝㻜㻢

㻡ᅇ┠ 㻝㻚㻝㻢㻤

ᖹᆒ 㻝㻚㻝㻢㻟

ࢰࣝ 2 㸪ࣃ࣮࢚࣐࣮࢟ࣥࣝࢆ 60 Υ࡛᧠ᢾΰྜᑒ ධࡋࡓࠋࣂ࢖࢔ࣝࡢእഃ࡟㟼㟁Ẽ㝖ཤࢫࣉ࣮ࣞ

ࢆᄇ㟝ࡋࠊ ᐃ࡟ࡣᾮయࢩࣥࢳ࣮ࣞࢩࣙࣥィᩘ

⿦⨨ (LSC-LB Ϭ㸪࢔ࣟ࢝ ) ࢆ⏝࠸ࡓࠋ⺯ග࡟ࡼࡿ␲

ఝィᩘࢆ㝖ࡃࡓࡵࠊ⿦⨨ࡢࢱ࣮ࣥࢸ࣮ࣈࣝ࡟ࣂ

࢖࢔ࣝࢆࢭࢵࢺࡋࠊ 1 ᪥௨ୖᨺ⨨ࡋ࡚࠿ࡽ ᐃࢆ

⾜࠺ࠋ ᐃ᫬㛫ࡣ 1 ヨᩱ࡟ࡘࡁ 50 ศ 10 ࣜࣆ࣮ࢺࢆ 4 ࢧ࢖ࢡࣝࠊྜィ 2000 ศ࡛࠶ࡿࠋࡓࡔࡋࠊࢱ࣮ࣥࢸ

࣮ࣈࣝୖ࡛ࣂ࢖࢔ࣝࡀ⛣ືࡋࡓᚋ࡟Ⓨ⏕ࡍࡿ㟼 㟁Ẽ࡞࡝࡟ࡼࡿ␲ఝィᩘࢆ㑊ࡅ࡚ࠊᏳᐃࡋࡓィ

ᩘ್࡛⃰ᗘ⟬ฟࢆ⾜࠺ࡓࡵࠊྛࢧ࢖ࢡࣝࡢ࠺ࡕࠊ 㹼ࣜࣆ࣮ࢺ┠ࢆྲྀࡾ㝖ࡁ඲ಶࡢ ᐃࢹ࣮ࢱ࡛

⃰ᗘ⟬ฟࢆ⾜ࡗࡓࠋ

3.6 㔜Ỉ⣲⃰ᗘ ᐃ

ࢺࣜࢳ࣒࢘⃰ᗘࢆồࡵࡿࡓࡵ࡟ࠊ㟁ゎ⃰⦰๓ ࡢヨᩱỈࢆ 1.2ȝL ࠊ㟁ゎᚋࡢヨᩱỈ 0.6ȝL ࢆ 800 Υ࡟

⇕ࡋࡓ㔠ᒓࢡ࣒ࣟ⢊ᮎ࡟⁲ୗࡋヨᩱỈࢆ㑏ඖࡋ Ỉ⣲࢞ࢫࢆⓎ⏕ࡉࡏࠊᏳᐃྠ఩యẚ㉁㔞ศᯒィ

Delta Plus ࢧ࣮ࣔࣇ࢕ࢵࢩ࣮ࣕࢧ࢖࢚ࣥࢸ࢕ࢵ

ࢡ࡛ヨᩱ୰ࡢỈ⣲ࡢᏳᐃྠ఩యẚ įD ࢆ ᐃࡋࡓࠋ 1 ᘧ࡟įD ࡢᐃ⩏ࢆ♧ࡍࠋ

(1)

(1) ᘧ࡛ (D/H)

ࡣ ᐃヨᩱỈࡢỈ⣲ྠ఩యẚࠊ

(D/H)

ࡣᶆ‽ヨᩱỈࡢỈ⣲ྠ఩యẚࢆ♧ࡍࠋࡲࡓ

įD ࡢ༢఩ࡣ [ ༓ศ⋡ࠊࣃ࣮࣑ࣝࠊ͙ ] ࡛࠶ࡿࠋ

3.7 ⿦⨨ᐃᩘ㹩

㟁ゎ⃰⦰๓ࡢࢺࣜࢳ࣒࢘⃰ᗘࢆ⟬ฟࡍࡿࡓࡵ

࡟ࡣࠊ㟁ゎ⃰⦰⿦⨨ࡢ⿦⨨ᐃᩘ㹩ࢆ▱ࡿᚲせࡀ

࠶ࡿࠋ⿦⨨ᐃᩘ㹩ࡣ㟁ゎ๓ᚋࡢࢺࣜࢳ࣒࢘⃰ᗘ ࡢẚ (T

/ T

) ࡜㟁ゎ๓ᚋࡢ㔜Ỉ⣲ẚ (D

/ D

) ࡢᑐᩘẚ

࡛⾲ࢃࡉࢀࡿࠋ

(2)

(2) ᘧ࡛ࡣ (1) ᘧ࡟࠾ࡅࡿ ( 㹂 / 㹆 )

ࡢ࠺ࡕࠊ㟁ゎ⃰

⦰๓ࡢ ( 㹂 / 㹆 )

ࢆ㹂

ࠊ㟁ゎ⃰⦰ᚋࡢ ( 㹂 / 㹆 )

ࢆ

㹂

࡜ࡋࡓࠋ

3.8 ࢺࣜࢳ࣒࢘⃰ᗘ⟬ฟ

ࢺࣜࢳ࣒࢘⃰ᗘ⟬ฟᘧࢆ (3) ࡟♧ࡍ

ࠋ (3) ᘧ࡟࠾

࠸࡚ T

ࡣࠊ᥇ྲྀヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘ [ ੯ /L] ࠊ T

ࡣ㟁ゎᚋࡢࢺࣜࢳ࣒࢘⃰ᗘ [ ੯ /L] ࡛࠶ࡾࠊ (Df/Di)

ࡣ㟁ゎ⃰⦰ಸ⋡ࢆ⾲ࢃࡍࠋ

(3)

4 . ⤖ᯝ࡜⪃ᐹ

4.1 ኱㟁ὶ㟁ゎ⃰⦰⿦⨨ࡢ⿦⨨ᐃᩘ⟬ฟ ࢺࣜࣆࣗ࢔༢య࡛ࡢ⃰⦰ࢆ⾜࠺ࡓࡵࠊ⿦⨨ᐃ

ᩘ㹩ࢆồࡵࡿᚲせࡀ࠶ࡿࠋࡑࡇ࡛ࠊࢺࣜࢳ࣒࢘

⃰ᗘࢆ⣙ 5 ੯ /L ࡟ㄪ〇ࡋࡓᶆ‽Ỉ࡛ 800mL ࠿ࡽ

80mL ࡲ࡛ࡢ㟁ゎ⃰⦰ࢆ 5 ᅇ⧞ࡾ㏉ࡋࠊ㟁ゎ๓ᚋ ࡢ T

, T

ཬࡧ D

, D

ẚࢆ (2) ᘧ࡟㐺⏝ࡋᚓࡽࢀࡓ್

ࢆ Table 1 ࡟♧ࡍࠋࡇࡢ 5 ᅇࡢࢹ࣮ࢱࢆᖹᆒࡋࠊ

㹩㸻1.163s0.033 (㹬㸻5) ࡜࠸࠺⤖ᯝࢆᚓࡓࠋ

Table 1 ኱㟁ὶ㟁ゎ⿦⨨ࢺࣜࣆࣗ࢔ࡢ⿦⨨ᐃᩘ

4.2 ࢺࣜࢳ࣒࢘ᅇ཰⋡

኱㟁ὶ㟁ゎ⿦⨨࡜⮬స㟁ゎ⿦⨨ࢆ⏝࠸ࡓ 2 ẁ㝵

⃰⦰ἲ࡛ࡣࠊయ✚ῶᐜ⋡ 15 ಸࡢ⃰⦰ࢆ⾜࠸ࠊ኱

㟁ὶ㟁ゎ⿦⨨ࢺࣜࣆࣗ࢔༢యࡢ⃰⦰ἲ࡛ࡣࠊయ

✚ῶᐜ⋡ 10 ಸࡢ⃰⦰ࢆ⾜ࡗࡓࠋᐇ㝿࡟࡝ࡢ⛬ᗘ

࡟ࢺࣜࢳ࣒࢘ࡀ⃰⦰ࡉࢀ࡚࠸ࡿ࠿ࢆࢺࣜࢳ࣒࢘

ᅇ཰⋡࡜ࡋ࡚⟬ฟࡋࡓࠋ㟁ゎ⃰⦰࡟ࡼࡿࢺࣜࢳ

࣒࢘ᅇ཰⋡ R ࡣ (4) ᘧ࡛⾲ࢃࡉࢀࡿࠋ

(4)

㽢

八戸工業大学エネルギー環境システム研究所紀要 第 9 巻

᥇ྲྀᖺ ᭶᪥ ⓑ὾ᾏᓊ ୕ἑ⁺  ᑿ㥨἟ Ἡᾏᓊ

㻞㻜㻜㻥 㻝㻜᭶㻞㻞᪥ 㻜㻚㻤㻜㻌 㻜㻚㻣㻠㻌 㻜㻚㻣㻠㻌 㻜㻚㻣㻤㻌 㻞㻜㻝㻜

㻝᭶㻞㻥᪥ 㻜㻚㻣㻣㻌 㻜㻚㻣㻡㻌 㻜㻚㻣㻡㻌 㻜㻚㻣㻟㻌 㻠᭶㻞㻥᪥ 㻜㻚㻣㻠㻌 㻜㻚㻣㻠㻌 㻜㻚㻤㻜㻌 㻜㻚㻣㻡㻌 㻝㻜᭶㻞㻞᪥ 㻜㻚㻣㻜㻌 㻜㻚㻣㻟㻌 㻜㻚㻣㻠㻌 㻜㻚㻣㻟㻌

㼇䠂㼉

᥇ྲྀᖺ ᭶᪥ ⓑ὾ᾏᓊ ୕ἑ⁺  ᑿ㥨἟ Ἡᾏᓊ

㻝᭶㻟㻝᪥ 㻜㻚㻣㻠 㻜㻚㻣㻞 㻜㻚㻣㻞 㻜㻚㻢㻢

㻠᭶㻞㻥᪥ 㻜㻚㻣㻡 㻜㻚㻣㻠 㻜㻚㻤㻜 㻜㻚㻢㻡

㻝㻜᭶㻞㻣᪥ 㻜㻚㻣㻝 㻜㻚㻣㻜 㻜㻚㻣㻟 㻜㻚㻣㻝

㻝᭶㻞㻥᪥ 㻜㻚㻣㻥 㻜㻚㻢㻟 㻜㻚㻣㻜 㻜㻚㻣㻤

㻠᭶㻞㻥᪥ 㻜㻚㻣㻡 㻜㻚㻣㻢 㻜㻚㻣㻢 㻜㻚㻣㻡

㼇䠂㼉 㻞㻜㻜㻥

㻞㻜㻜㻤

Ͳ50 Ͳ40 Ͳ30 Ͳ20 Ͳ10 0 10 20

ⓑ὾ᾏᓊ ୕ἑ⁺  ᑿ㥨἟ Ἡᾏᓊ

᥇ྲྀヨᩱ䛾į䠠(‰)

ࡇࡇ࡛ࠊ V

ࡣ㟁ゎ๓ヨᩱయ✚ [mL] V

ࡣ㟁ゎᚋヨ

ᩱయ✚ [mL] ࡛࠶ࡿࠋ

Table 2 ࠾ࡼࡧ Table 3 ࡟ᚓࡽࢀࡓࢺࣜࢳ࣒࢘ᅇ

཰⋡ࢆ♧ࡍࠋ

Table 2 ࢺࣜࢳ࣒࢘ᅇ཰⋡ (2 ẁ㝵⃰⦰ἲ )

Table 3 ࢺࣜࢳ࣒࢘ᅇ཰⋡(༢య⃰⦰ἲ)

ᚓࡽࢀࡓࢺࣜࢳ࣒࢘ᅇ཰⋡ࡣ 2 ẁ㝵⃰⦰ἲ࡛ࡣ ᖹᆒ࡛ 0.73 s 0.04 (n=20) ࠊ༢య⃰⦰࡛ࡣ 0.75 s 0.03

(n=16) ࡛࠶ࡗࡓࠋ༢య⃰⦰ࡢ᪉ࡀᅇ཰⋡ࡢࡤࡽࡘ

ࡁࡀᑡ࡞࠿ࡗࡓࠋཪࠊ2 ẁ㝵⃰⦰ࡢሙྜࠊయ✚ῶ ᐜ⋡ࡀ኱㟁ὶ㟁ゎ⿦⨨༢యࡢሙྜࡼࡾ 1.5 ಸ኱ࡁ

࠸࡟ࡶ㛵ࢃࡽࡎࢺࣜࢳ࣒࢘ࡢᅇ཰⋡ࡀࡑࢀ࡯࡝

పୗࡋ࡞࠸ࡢࡣࠊ➨ 2 ẁ㝵ࡢ⮬స㟁ゎ⿦⨨࡟ࡼࡿ

ࢺࣜࢳ࣒࢘ᅇ཰⋡ࡀࡸࡸ㧗࠸ࡓࡵ

࡜᥎ ࡉࢀࡿࠋ

4.3 㔜Ỉ⣲ ț D

Fig.3 ࡟᥇ྲྀヨᩱࡢ㔜Ỉ⣲ț D ࡢ ᐃ⤖ᯝࢆ♧

ࡍࠋᾏỈࡢ įD ࡢ್ࡣ 0 ࡟㏆ࡃࠊ㝣Ỉࡸ㞵࡞࡝ࡢ ᙳ㡪ࢆཷࡅࡿ࡜࣐࢖ࢼࢫࡢᩘ್ࢆ♧ࡍࡼ࠺࡟࡞

ࡿࠋᑿ㥨἟ࡀᖖ࡟࣐࢖ࢼࢫࡢ್࡞ࡢࡣࠊᑿ㥨἟

ࡀ㝣Ỉࡢᙳ㡪ࢆཷࡅࡿỶỈ†ࡢࡓࡵ࡜⪃࠼ࡽࢀ

ࡿࠋࡑࢀ࡟ᑐࡋ㝣Ỉࡢᙳ㡪ࡢᑡ࡞࠸Ἡᾏᓊࡣẚ

㍑ⓗ 0 ࡟㏆࠸್ࢆ♧ࡋ࡚࠸ࡿࠋ

ඵᡞᕤᴗ኱Ꮫᵓෆ࡛᥇ྲྀࡋࡓỈ㐨Ỉ ( ᆅୗỈ ) ࡢ ț D ࡢᖹᆒࡣ -54.5 ͙࡛࠶ࡗࡓ

ࠋࡋࡓࡀࡗ࡚ࠊ

Fig.3 ࡟࠾࠸࡚ⓑ὾ᾏᓊ࡛ -33 ͙ࠊ୕ἑ⁺ ࡛ -22 ͙

ࡢ್ࡀ♧ࡉࢀ࡚࠸ࡿࡀࡇࢀࡽࡢᾏỈࡣ㝣Ỉࡢᙳ 㡪ࡀᙉ࠸ሙྜ࡛࠶ࡿࠋ

Fig.3 ᥇ྲྀヨᩱࡢ㔜Ỉ⣲ț D

ە:2008 1/31 ڦ:2008 4/29 ڸ:2008 10/27 ی :2009 1/29 ݳ :2009 4/29 ڧ :2009 10/22 ڹ :2010 1/29 ۍ :2010 4/29 ۑ :2010 10/22

4. 4 ࢺࣜࢳ࣒࢘⃰ᗘ

Fig.4 ࠿ࡽ Fig.7 ࡟ྛᆅⅬࡢࢺࣜࢳ࣒࢘⃰ᗘࡢ 

ᐃ⤖ᯝࢆ♧ࡍࠋ

2008 ᖺ 1 ᭶ 31 ᪥࡟ⓑ὾ᾏᓊ࡜୕ἑ⁺ ࡛᥇Ỉ ࡋࡓヨᩱỈ࡜ࠊ 2009 ᖺ 1 ᭶ 29 ᪥࡟ᑿ㥨἟࡛᥇Ỉ ࡋࡓヨᩱỈ࡛ࢺࣜࢳ࣒࢘⃰ᗘࡢୖ᪼ࡀ☜ㄆࡉࢀ

ࡓࠋ⃰ᗘୖ᪼᫬ࢆ㝖࠸ࡓྛᆅࡢᖹᖖ᫬ࡢࢺࣜࢳ

࣒࢘⃰ᗘࡣⓑ὾ᾏᓊࠊ୕ἑ⁺ ࠊἩᾏᓊࡢ 3 ࠿ᡤ

࡛ 0.3 ੯ /L ௨ୗ࡛࠶ࡾࠊᑿ㥨἟ࡣᑡࡋࡔࡅ㧗ࡃ 0.5 ੯ /L ௨ୗ࡜࡞ࡗࡓࠋᑿ㥨἟ࡣ㝣Ỉ࡜ᾏỈࡀΰ ࡊࡾྜ࠺ỶỈ†ࡢࡓࡵࡇࡢࡼ࠺࡞⤖ᯝ࡟࡞ࡗࡓ

࡜⪃࠼ࡽࢀࡿࠋࡲࡓࠊFig.6 ࡢ⤖ᯝࢆࡳࡿ࡜ 2008 ᖺࡼࡾ 2009 ᖺࠊ 2010 ᖺ࡟࠾࠸࡚ࢺࣜࢳ࣒࢘⃰ᗘ ࡀపୗࡋ࡚࠸ࡿࠋࡇࢀࡣ 2009 ᖺࠊ 2010 ᖺࡣ࢔ࢡ ࢸ࢕ࣈヨ㦂ࡀఇṆࡉࢀࢺࣜࢳ࣒࢘ࢆྵࡴ᤼ᾮࡢ ᨺฟ㔞ࡀపୗࡋࡓࡓࡵ࡜⪃࠼ࡽࢀࡿࠋ

4.5 ୕ἑ⁺ ࡜୕ἑᾏᓊࡢࢺࣜࢳ࣒࢘⃰ᗘ 2008 ᖺ 1 ᭶ 31 ᪥࡟୕ἑ⁺ ࡜୕ἑᾏᓊ࡛᥇Ỉ ࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘࡢ ᐃ⤖ᯝࢆ Fig.8 ࡟ࠊ

ࡲࡓ᥇ྲྀᆅⅬࡢ఩⨨㛵ಀࢆ Fig.9 ࡟♧ࡍࠋ

̶ 13 ̶

䘡䠞

0.0 0.3 0.6 0.9 1.2 1.5

1/31 4/29 10/27 1/29 4/29 10/22 1/29 4/29

2008 2009 2010

䝖䝸䝏䜴䝮⃰ᗘ䠄Bq/L)

10/22

0.0 0.3 0.6 0.9 1.2 1.5

1/31 4/29 10/27 1/29 4/29 10/22 1/29 4/29

2008 2009 2010

䝖䝸䝏䜴䝮⃰ᗘ䠄Bq/L)

10/22

0.0 0.3 0.6 0.9 1.2 1.5

1/31 4/29 10/27 1/29 4/29 10/22 1/29 4/29

2008 2009 2010

䝖䝸䝏䜴䝮⃰ᗘ䠄Bq/L)

10/22

୕ἑᾏᓊ

୕ἑ⁺ 

䝖䝸䝏䜴䝮⃰ᗘ䠄Bq/L)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

B

A ^{2008 ᖺ 1 ᭶ 31 ᪥ ᥇ྲྀ}

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

1/31 4/29 10/27 1/29 4/29 10/22 1/29 4/29

2008 2009 2010

䝖䝸 䝏 䜴 䝮 ⃰ ᗘ 䠄

10/22

Fig.4 ⓑ὾ᾏᓊ࡛᥇ྲྀࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘ

Fig.5 ୕ἑ⁺ ࡛᥇ྲྀࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘ

Fig.6 ᑿ㥨἟࡛᥇ྲྀࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘ

Fig.7 Ἡᾏᓊ࡛᥇ྲྀࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘ

Fig.8 ࢺࣜࢳ࣒࢘⃰ᗘࡢẚ㍑

A: ୕ἑ⁺  B: ୕ἑᾏᓊ

Fig.9 ୕ἑ⁺ ࡜୕ἑᾏᓊࡢ᥇ྲྀᆅⅬࡢ఩⨨㛵ಀ

A: ୕ἑ⁺  B: ୕ἑᾏᓊ

2008 ᖺ 1 ᭶ 31 ᪥࡟᥇ྲྀࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘

⃰ᗘࡣ A ࡢ୕ἑ⁺ ࡛ 3.9 ੯/LࠊB ࡢ୕ἑᾏᓊ࡛

1.4 ੯ /L ࡛࠶ࡗࡓࠋࡇࡢ⤖ᯝࡣࠊࡇࡢ᫬ᮇࡣ⃰ᗘ ῶᑡ᫬ᮇ࡛࠶ࡾࠊ୕ἑᾏᓊࡢ᪉ࡀᾏỈ࡟ࡼࡗ࡚

ᕼ㔘ࡉࢀࡸࡍ࠸ࡓࡵࠊ㜵Ἴሐෆഃࡢ୕ἑ⁺ ࡼ

ࡾ୕ἑᾏᓊࡢ᪉ࡀ⃰ᗘࡀపୗࡋࡓࡶࡢ࡜ゎ㔘࡛

ࡁࡿࠋ

ࡋ࠿ࡋࠊ 2008 ᖺ 4 ᭶ 29 ᪥࡟୕ἑ⁺ ࡛᥇Ỉࡋ ࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘࡣ 0.3 ੯ /L ⛬ᗘ࡛࠶ࡗࡓ ࡢ࡛ࠊ㜵Ἴሐࡢෆഃࡢ୕ἑ⁺ ࡛ࡣࠊ୕ἑᾏᓊ

ࡼࡾࡸࡸ㐜ࢀ࡚⃰ᗘࡀᖹᖖ್࡟ᅇ᚟ࡋࡓ࡜᥎ᐃ

ࡉࢀࡿࠋ

八戸工業大学エネルギー環境システム研究所紀要 第 9 巻

5. ࡲ࡜ࡵ

1) ኱㟁ὶ㟁ゎ⿦⨨ࢺࣜࣆࣗ࢔ࢆ⏝࠸ࡓヨᩱỈ

㔞 800mL ࠿ࡽ 80mL ࡲ࡛ࡢయ✚ῶᐜ⋡ 10 ಸ⃰⦰

ࡢ⿦⨨ᐃᩘࡣࠊ㹩㸻 1.163 s 0.033 (n 㸻 5) ࡀᚓࡽࢀ

ࡓࠋ

2) ࢺࣜࢳ࣒࢘ᅇ཰⋡ࡣ኱㟁ὶ㟁ゎ⿦⨨ࢺࣜࣆ

ࣗ࢔ࢆ⏝࠸࡚ 1000mL ࠿ࡽ 200mL ࡲ࡛ 5 ಸ⃰⦰ࡋࠊ

⮬స㟁ゎ⿦⨨ࢆ⏝࠸࡚ 200mL ࡢ࠺ࡕ 180mL ࢆ 60mL ࡲ࡛ 3 ಸ⃰⦰ࡍࡿྜィ 15 ಸࡢ 2 ẁ㝵⃰⦰࡛

ࡣ 0.73 s 0.045 (n=20) ࠋࡑࡋ࡚኱㟁ὶ㟁ゎ⿦⨨ࢺࣜ

ࣆࣗ࢔༢యࢆ⏝࠸࡚ 800ml ࠿ࡽ 80ml ࡲ࡛⃰⦰ࡍ

ࡿ༢య⃰⦰࡛ࡣ 0.75 s 0.027 (n=16) ࡜࠸࠺⤖ᯝࢆᚓ ࡓࠋ

3) ᑿ㥨἟ࡣ㝣Ỉࡢᙳ㡪ࢆཷࡅࡿỶỈ†ࡢࡓࡵࠊ 㔜Ỉ⣲ț D ࡀᖖ࡟࣐࢖ࢼࢫࡢ್ࢆ♧ࡍ࡜⪃࠼ࡽࢀ

ࡿࠋࡑࢀ࡟ᑐࡋ㝣Ỉࡢᙳ㡪ࡢᑡ࡞࠸Ἡᾏᓊࡣẚ

㍑ⓗ 0 ࡟㏆࠸್ࢆ♧ࡋ࡚࠸ࡿࠋࡲࡓࠊⓑ὾ᾏᓊࠊ

୕ἑ⁺ ࡛ࡣ᫬࡜ࡋ࡚㝣Ỉࡢᙳ㡪ࡀぢࡽࢀࡿࡇ

࡜ࡀ᥇ྲྀࡋࡓヨᩱỈࡢ㔜Ỉ⣲ț D ࡢ್࠿ࡽ᥎ ࡉ

ࢀࡓࠋ

4) 2008 ᖺ 1 ᭶ 31 ᪥࡟ⓑ὾ᾏᓊཬࡧ୕ἑ⁺ ࡛

᥇ྲྀࡋࡓᾏỈࠊཬࡧ 2009 ᖺ 1 ᭶ 29 ᪥࡟ᑿ㥨἟࡛

᥇ྲྀࡋࡓヨᩱỈࡢࢺࣜࢳ࣒࢘⃰ᗘࡣᖹᖖ᫬ࡢࢺ

ࣜࢳ࣒࢘⃰ᗘࡼࡾࡸࡸ㧗ࡃࠊࢺࣜࢳ࣒࢘ࢆྵࡴ

᤼ᾮᨺฟࡢᙳ㡪࡜᥎ ࡉࢀࡿࠋ

5) 2008 ᖺ 1 ᭶ 31 ᪥࡟୕ἑ⁺ ࡜୕ἑᾏᓊ࡛᥇

ྲྀࡋࡓヨᩱỈࡢࢺࣜࢳ࣒࢘⃰ᗘࢆẚ㍑ࡋࡓ⤖ᯝࠊ

୕ἑ⁺ ࡛᥇ྲྀࡋࡓヨᩱࡢࢺࣜࢳ࣒࢘⃰ᗘࡀ㧗

࠿ࡗࡓࠋࡇࡢࡇ࡜࠿ࡽࠊ୕ἑᾏᓊࡼࡾ୕ἑ⁺ 

ࡢ᪉ࡀ⃰ᗘῶᑡ࡟ࡸࡸ᫬㛫ࢆせࡍࡿࡇ࡜ࡀ♧၀ ࡉࢀࡓࠋ

ㅰ㎡

ᵝࠎ࡞࢔ࢻࣂ࢖ࢫࡸᣦᑟࢆࡋ࡚䛔䛯䛰䛔䛯䚸ᮏ Ꮫ኱Ꮫ㝔㻌 ᶵᲔ䝅䝇䝔䝮ᕤᏛᑓᨷ༤ኈᚋᮇㄢ⛬ಟ

஢䛾㻌 ᓥ㻌 㛗⩏༤ኈ䛻῝ㅰࡢពࢆ⾲ࡋࡲࡍ䚹ࡲࡓࢺ

ࣜࢳ࣒࢘⃰ᗘ⟬ฟࡢᐇ㦂࡟࠿࠿ࢃࡗࡓࠊ⏕≀⎔

ቃ໬ᏛᕤᏛ⛉ᖹᡂ 20 ᖺᗘ༞◊⏕ࡢஂಖᙲᏕྩ㸪 ᖹᡂ 21 ᖺᗘ༞◊⏕ࡢ኱ᔱ㐩ஓྩ㸪ᮧ஭኱ᖹྩ㸪 ᖹᡂ 22 ᖺᗘ༞◊⏕ࡢ㐲⸨⥲ྖᮁྩ࡟ឤㅰࡢពࢆ

⾲ࡋࡲࡍࠋ

ཧ⪃ᩥ⊩

1) 㟷᳃┴ཎᏊຊࢭࣥࢱ࣮㸸㟷᳃┴ཎᏊຊࢭࣥࢱ

࣮ᡤሗ➨ 4 ᕳ (2010)

2) ⎔ቃ⛉Ꮫᢏ⾡◊✲ᡤ㸸⎔ቃ⛉Ꮫᢏ⾡◊✲ᡤᖺ ሗᖹᡂ 20 ᖺᗘ (2009)

3) ᓥ 㛗⩏㸪ᮧ୰ ೺㸸 RADIOISTOPES, 56, 455- 461 (2007)

4) Hisayoshi Sato, Takeshi Muranaka, Nagayoshi Shima

and Susumu Takahashi 㸸 RADIOISTOPES, 54, 229-232

(2005)