株式会社日本遮蔽技研（サンガホールディングス）Japan Shield Technical Research Co., Ltd. (SANGA Holdings) ◇ 963–8041 福島県郡山市富田町字権現林11番地 ◇ Gongen-bayashi 11, Tomita-machi, Koriyama-shi, Fukushima Pref. 963–8041, Japan
減塩しおでは，塩分の過剰摂取を防ぐため，塩の主成分である塩化ナトリウムの30あるいは50 wt％程度が，塩化カリウムに置き換えられている。カリウムには天然の40K（0.0117％）が含まれているため，減塩しおからは放射線が放出される。そこで減塩しおに圧縮成形法を適用して自然放射能線源を製作し，形状や1分間計数を調べるとともに放射線防護の三原則に関する測定試験を行って，線源教材としての実用性を評価した。
Low-sodium salt is produced to prevent over-consumption of salt by substituting potassium chloride (KCl) for 30 or 50 wt％ of sodium chloride (NaCl) in the usual salt produced from sea water. As 0.0117％ of naturally occurring potassium contains radioactive nuclide 40K, low-sodium salt emit radiation. Therefore, the compression and formation method was applied to fabricate disk-shaped natural radiation sources from the branded low-sodium salt (LSS-source), Yasashio (Ajinomoto Co., Inc.). Thus, 22 sources were fabricated and their weight, thickness, diameter, and 1-min counts were examined. Measurement tests on the three principles of radiation protection were performed to evaluate the practical suitability of the LSS-source for educational use. It was found that the individual differences of the 22 LSS-sources were very small. In addition, LSS-sources are useful educational radiation sources compared with KCl-natural radiation sources, and comprehensible results were obtained for LSS-sources more than for kelp-natural radiation sources.
Key words: radiation education; low-sodium salt; natural radiation source
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