Effects of Storage Time and Pre-Etching Treatment of CR-39 Detectors on Their Response to Alpha Radiation Exposure

Miroslaw Janik, Md. Mahamudul Hasan, Peter Bossew and Norbert Kavasi
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Miroslaw Janik: Department of Radiation Measurement and Dose Assessment, National Institute of Radiological Sciences (QST/NIRS), Chiba 263-8555, Japan
Md. Mahamudul Hasan: Department of Environment Systems, Graduate School of Frontier Sciences, Kashiwa Campus, The University of Tokyo, Chiba 277-8561, Japan
Peter Bossew: Section Radon and NORM, German Federal Office for Radiation Protection (BfS), 10318 Berlin, Germany
Norbert Kavasi: Department of Environmental Sciences, Jožef Stefan Institute, 1000 Ljubljana, Slovenia

IJERPH, 2021, vol. 18, issue 16, 1-18

Abstract: Radon passive monitors based on solid state nuclear track detectors (SSNTD), especially CR-39, are widely used in radon and thoron studies. They may be subjected to the influence of external factors, like changing of temperature, humidity, and pressure, both before and during the measurement. Evaluation of the exposed detectors involves chemical processing, whose conditions also influence the measurement results. The aim of this study was to check several factors, as to whether they may modify the response of CR-39 detector: concerning the phase before evaluation, storage time, and temperature during storage; and concerning the evaluation procedure, etching time, and pre-etching treatment using hot water and carbon dioxide atmosphere. Two experiments were conducted by irradiation of CR-39 detectors using alpha particles emitted from a mono-energetic 241 Am source and exposed in radon atmosphere. Track density dependence of the age of production was found to be statistically not significant. On the other hand, pre-etching treatment using hot water and carbon dioxide with different etching times showed statistically significant effects on track area, track sensitivity, and roundness. It was concluded that there are simple methods to increase performance of nuclear track detectors, and that storage time is not a factor of concern.

Keywords: radon; CR-39; ageing; sensitization; track density (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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