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Updated: May 11, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
[Radioactive contamination of foods marketed in saitama prefecture]
Terumitsu Yoshida1, Yoshiyuki Nagahama, Mikiko Takekuma
1Saitama Prefectural Institute of Public Health, Saitama 338–0824, Japan. yoshida.terumitsu@pref.saitama.lg.jp
Abstract:
Up to October 31, 2012, a total of 170 food samples marketed in Saitama Prefecture were examined following the setting of provisional regulatory limits for radioactivity in drinking water and foodstuffs by the Ministry of Health, Labour and Welfare on 1 April 2012. No sample exceeded the regulatory limits as determined by gamma ray spectrometry with a germanium semiconductor detector. However the radioactive cesium concentrations of food samples such as raw wood-shiitake and maccha (powdered green tea) produced in Saitama were nearly at the regulatory limits, being 74 Bq/kg and 84 Bq/kg, respectively.
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