Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 67(9): 427-434 (2018)


個人積算線量計を用いた樹体における環境放射能の簡易測定手法の開発Development of an Easy and Simple Method to Measure the Environmental Radioactivity in Trees with Efficient Personal Dosimeters

1量子科学技術研究開発機構高崎量子応用研究所Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology ◇ 370–1292 群馬県高崎市綿貫町1233 ◇ 1233 Watanuki, Takasaki-shi, Gunma Pref. 370–1292, Japan

2電力中央研究所環境科学研究所Laboratory of Environmental Science, Central Research Institute of Electric Power Industry (CRIEPI) ◇ 270–1194 千葉県我孫子市我孫子1646 ◇ 1646 Abiko, Abiko-shi, Chiba Pref. 270–1194, Japan

受付日:2018年4月17日Received: April 17, 2018
受理日:2018年5月30日Accepted: May 30, 2018
発行日:2018年9月15日Published: September 15, 2018


We have developed a simple method for the long-term monitoring of the seasonal variation of the radiocaesium radioactivity in trees using commercially available integrating dosimeters. Experiments and Monte Carlo simulations were performed to assess whether the proposed dosimeter-based method could measure the seasonal variation. From the experimental results, the performance variation among individual dosimeters was found to be 1.6%, which is sufficiently small compared with the expected seasonal variation. Moreover, the simulation results indicated that the measured value of the dosimeter increased owing to the photons passing through a stem, and a correction factor was necessary to compensate the influence of photon absorption and scattering in stem. We suggested that the simple and easy dosimeter-based method could be useful to measure the seasonal variations of radioactivity in trees.

Key words: radio caesium; PHITS (Particle and Heavy Ion Transport code System); dosimeter; environment; Monte Carlo simulation

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