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Evolution of content of 137 Cs at Czech population after the Chernobyl accident

Every year, a monitoring of an internal contamination with 137Cs is carried out in SÚRO (NRPI) Prague. The monitoring is performed in whole-body counting laboratory on a reference group of 30 people (15 male and 15 female), mainly Prague inhabitants between the ages of 27 and 77 years. Based on those measurements in the year of 2016, the average activity of 137Cs in an individual body has been estimated to be 23 Bq.

As in previous years, national survey of internal contamination with 137Cs has been carried out based on the urinary excretion of 137Cs in 24-hour samples. Urine samples were collected from 44 females and 26 males, representatives of average population by their diet. Average activity of 137Cs excreted in 24-hour urine sample is 0.12 Bq, resulting in a calculated average body content of 137Cs (retention) of 20 Bq. Based on the results from the national survey, the committed effective dose from 137Cs is estimated to be 0.69 μSv. Development in time of the average retention of 137Cs obtained from the both data sets since the year 1986 is given in the picture.

A group of people having special dietary habits in terms of increased game meat consumption, namely wild boar meat, was also monitored in 2016. Annual intake of 137Cs for a person in this group is estimated to be 7300 Bq based on the average 24-hour urine excretion of 137Cs, resulting in the committed effective dose from 137Cs of 95 μSv.

Evolution of content of 137 Cs at Czech population after the Chernobyl accident