Development of Estimation Method of <sup>222</sup>Rn Level in Water Considering Its Diffusion from Polyethylene Bottle to Atmosphere

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  • KAWABATA Kuniyo
    Admission Center, Institute for Comprehensive Education, Kagoshima University Graduate School of Science and Engineering, Kagoshima University
  • KITAMURA Yujin
    Graduate School of Science and Engineering, Kagoshima University
  • TOMIYASU Takashi
    Graduate School of Science and Engineering, Kagoshima University

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Other Title
  • ポリエチレン保存容器から大気への拡散を考慮した水中ラドン濃度推定法の開発
  • ポリエチレン ホゾン ヨウキ カラ タイキ エ ノ カクサン オ コウリョ シタ スイチュウ ラドン ノウド スイテイホウ ノ カイハツ
  • Development of estimation method of 222 Rn level in water considering its diffusion from polyethylene bottle to atmosphere

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Abstract

<p>222Rn is a radioactive noble gas that occurs naturally in Earth’s crust as an intermediate step in the normal radioactive decay chain of uranium series. A high concentration of radon exposure in air and water causes damage to human cells, therefore the radon concentration in buildings and the diffusive coefficient of shield films have been studied. On the other hand, Radon shows a high solubility for water, and thus a high mobility through groundwater in Earth’s crust. The concentration of radon in crustal fluid and groundwater can provide a clue to understand the state of crustal deformation as crack formation and change in the strain state, because its release rate depends mainly on the rock surface area. The radon concentration in groundwater is usually measured on the sampling site, due to a decrease after sampling by its continuous decay and diffusion to air. To measure the radon concentration at a laboratory, we tried to estimate a diffusion coefficient of the radon for a polyethylene bottle used for keeping water samples in this study. We collected water samples from three hot springs at Sakurajima district in Kagoshima, Japan. We estimated the diffusion coefficient by measuring the radon concentration in the water at different times after several hours of keeping. The estimated diffusion coefficients are 1.6 - 2.4 × 10−11 m2s−1 (averaged: 1.9 × 10−11 m2s−1). The values are similar to those from an experiment using polyethylene films, suggesting that the diffusion coefficient obtained in this study is reasonable. Concerning the error on the estimated diffusion coefficient obtained here, we used maximum residual value range of the estimated value, 20 %, because the residual error on the estimated values was larger than that on the measurement.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 68 (5), 333-338, 2019-05-05

    The Japan Society for Analytical Chemistry

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