Radioactivity of fertilizer and china (NORM) in Japan

Michikuni Shimo, Yuka Matsuura, Noriko Itoh, Kazutaka Ejiri, Kazuyuki Minami

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Radioactivity of 6 fertilizer samples, 7 china clay samples and 5 china glaze samples, which are commonly used in Japan, was measured using a NaI(Tl) scintillation spectrometer. Potassium activity of fertilizer was almost 540-740 Bq/kg, and the highest activity was 9,100 Bq/kg. Activity of fertilizer was 10 times higher for potassium than for uranium-series. Furthermore, these activities were 25 times for potassium and 18 times for uranium-series in comparison with those in natural soil. In china clay, activities of potassium, uranium-series nuclides and thorium-series nuclides were 543-823 Bq/kg, 74.6-94.3 Bq/kg, and 86.3-128 Bq/kg, respectively. These were 1.5-2.2, 2.1-2.6 and 2.3-3.5 times higher than activity of common soil. Activity of glaze was almost equal to that of china clay.

Original languageEnglish
Title of host publicationThe Natural Radiation Environment - 8th International Symposium (NRE VIII)
Number of pages4
Publication statusPublished - 26-09-2008
Event8th International Symposium on the Natural Radiation Environment, NRE VIII - Buzios, Rio de Janeiro, Brazil
Duration: 07-10-200712-10-2007

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other8th International Symposium on the Natural Radiation Environment, NRE VIII
CityBuzios, Rio de Janeiro

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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