Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 67 , Issue 11
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Technical Report
  • Takao Kawano
    2018 Volume 67 Issue 11 Pages 559-569
    Published: November 15, 2018
    Released: November 15, 2018

    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.

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