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2018 Fiscal Year Final Research Report

Improvement of low radiation dose estimation by ESR dosimetry with tooth enamel for the radiation accidents

Research Project

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Project/Area Number 15K08697
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Medical Physics and Radiological Technology
Research InstitutionKumamoto University

Principal Investigator

SHIMASAKI Tatsuya  熊本大学, 生命資源研究・支援センター, 助教 (60264248)

Project Period (FY) 2015-10-21 – 2019-03-31
KeywordsESR / 低線量被ばく線量測定法 / 歯エナメル / 甲状腺被ばく線量 / 福島第一原発事故 / 長崎原爆被ばく線量 / 遠距離被ばく / 電子スピン共鳴法
Outline of Final Research Achievements

ESR (electron spin resonance) method has been applied to obtain the retrospective radiation doses given to human by various radiation accidents. Using analysis software "ESR Data Process" of the ESR measurement spectrum, we evaluated a radiation dose by subtraction technique to take away an organic radical ESR signal of the dentin of the background from the teeth enamel ESR signal of the tooth extraction sample. As a result, we were able to evaluate the low dose radiation exposure that was lower than about 0.1Gy. We assessed that the dose ranging 0.040-0.70 Gy would be due to dental diagnostic x rays. Furthermore, we will evaluate a radiation dose by subtraction technique about people exposed to radiation with Fukushima nuclear plant accident and at a long distance with Nagasaki atom bomb.

Free Research Field

放射線防護学

Academic Significance and Societal Importance of the Research Achievements

歯エナメルを線量測定素子としたESR線量測定法は、基本的な手法が確立され国際原子力機関(IAEA)のTECDOC-1331 や国際標準化機構(ISO)の13304-1で標準化が進められている。一方、これまでの放射線事故にも積極的に利用されてきた。特に長崎・広島の原爆被爆者の被ばく線量推定にも用いられてきた。しかしながら 0.10 Gy 以下の低線量に関しては、その検出限界によりESR線量測定法が十分に活用できていない。我々は、0.10 Gy 以下の低線量でも線量評価ができるESR線量測定法を確立し、福島や長崎で問題となっている低線量被ばく集団に適用し、精度の高い被ばく線量評価を目指している。

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Published: 2020-03-30  

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