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Dr. Tsubokura's Radiation Lecture Vol.21

Author: Masaharu Tsubokura

Editors: Akihiko Ozaki M.D., Yuki Senoo

41. Determination of radiation abundance using cesium

A main cause of internal exposure is the ingestion of contaminated food. To prevent an excessive level of internal exposure from food, the reference value of cesium has been established as 100 Becquerel/kg.

Although the reference value is only determined for cesium, it does not mean that we do not consider the influence of other radioactive substances, including strontium, the measurement of which is not simple.

Currently, cesium is considered a predominant part of the radioactive substances that can enter our bodies, and previous studies reported a rough ratio of the amount of each radioactive substance in the environment compared to that of cesium.