2019 Fiscal Year Final Research Report

Tritiumu measurement in foods by whole quenching correction method in LSC

Research Project

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Project/Area Number	17K07006
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Nuclear engineering
Research Institution	University of Toyama
Principal Investigator	hara masanori 富山大学, 学術研究部理学系, 准教授 (00334714)
Co-Investigator(Kenkyū-buntansha)	阿蘇司富山高等専門学校, その他部局等, 教授 (30290737) 庄司美樹富山大学, 研究推進機構研究推進総合支援センター, 准教授 (30361950)
Project Period (FY)	2017-04-01 – 2020-03-31
Keywords	トリチウム測定 / 液体シンチレーションカウンタ / クエンチング校正
Outline of Final Research Achievements	To obtain the activity of tritium by LSC, the quenching correction is indispensable. The two-dimensional scintillation spectra were measured by the conventional LSC connected with an external multi-channel analyzer. In less quenching cocktail, two-dimensional scintillation spectra were extended along the 45 deg. line. The shape of spectrum was changed into a kind of sector with increasing the color quenching. Therefore, the shape of spectrum would give the information of color quenching. However, the influence of color quenching was, qualitatively, less significant for the relationship between the counting efficiency of tritium and the quenching index parameter. The analysis method of two-dimensional spectrum should be considered to clearly separate the influence of color quenching.
Free Research Field	トリチウム安全取扱い
Academic Significance and Societal Importance of the Research Achievements	福島第一原子力発電所事故の収束作業に伴い，トリチウムを含む処理水が日々発生し，敷地内に貯水されている．処理水中のトリチウム濃度を迅速に測定する手法と社会的な要請として食品中のトリチウム濃度測定を行う手法が必要である．液体シンチレーション計測法は，液体中のトリチウムを高感度で測定できる唯一の方法である．しかし，この計測法において正確なトリチウム濃度を求めるには，試料のクエンチング評価が必要不可欠である．カラークエンチングの影響を避けるための脱色処理に時間がかかるために迅速な測定ができない．本研究ではカラークエンチングの評価手法に関する研究を行った．