1 兵庫医科大学大学院薬学研究科Graduate School of Pharmacy, Hyogo Medical University
2 兵庫医科大学薬学部School of Pharmacy
空気中に存在する天然核種を線源とした新規放射線教育を提案する。空気清浄機にて捕集したHEPAフィルターでは様々な種類の放射線が検出された。計測値は捕集開始後90 minほどで定常状態に到達した後，約36 minの半減期にて減衰した。さらに波高弁別分析器によるγ線スペクトル解析では222Rn子孫核種である214Pb及び214Biが検出された。
We propose the novel source for radiation education using natural nuclides containing in the air. After sampling by air cleaner, remarkable radiation count was found at several survey meters in HEPA filter. These counts showed a gradually increase and reached the steady-state after 90 min collection time. Attenuation of radioactivity showed according to the first-order reaction equation and half-life was estimated about 36 min. Moreover, the energy peaks of 214Pb and 214Bi as progenies of 222Rn were detected in the γ-ray spectral analysis using multi-channel analyzer.
Key words: radiation education; radioactive dust; radon-222 and its progeny; gamma-ray spectra
© Japan Radioisotope Association 2025. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)© Japan Radioisotope Association 2025. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)
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