兵庫医療大学薬学部School of Pharmacy, Hyogo University of Health Sciences
天然放射性核種の40K, 87Rb及び176Luは試薬として入手可能で，放射線管理が不要である。これらは教育用または汎用型計測器にて計測が可能である。遮蔽試験にて計数値は指数関数的に減衰し，核種毎で異なる半価層を示した。またγ線スペクトロメトリによる核種推定も可能であった。よって，天然放射性核種は放射線教育の有用な教材となりうる。
We developed an educational program to estimate attenuation properties for natural radionuclides from commercially available reagents. Potassium chloride, rubidium chloride and lutetium oxide were purchased and used as radiation sources for 40K, 87Rb and 176Lu, respectively. These nuclides have long half-lives and exhibit a variety of radioactive decays. The radiation counts decreased exponentially with the increased thickness of aluminum shields, and each radionuclide showed a specific half-value layer. In addition, the radionuclides in Doll stone were identified by the X-ray spectrometry. In conclusion, commercially available reagents are available for planning educational programs for radiation and radioactivity.
Key words: radiation education; reagent; potassium-40; rubidium-87; lutetium-176
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