Intake of exp 226 Ra by Ingestion and Its Evaluation in a Selected Population Group

摘要

The activity of exp 226 Ra was followed in drinking waters of Western Slovakian region and in the all-day-food. The volume activities of exp 226 Ra in drinking waters were in the range 0 to 63 mBq.1 exp -1 (0.0 to 1.7 pCi.1 exp -1 ) with a mean value 9.3 mBq.1 exp -1 (0.25 pCi.1 exp -2 ). The average activity of exp 226 Ra in the food, as expressed per person and day, was 47.7 mBq (1.29 pCi). The total intake of exp 226 Ra by ingestion in the observed group, also calculated per person and day was on the average 57 mBq (1.54 pCi). The value found was used for the evaluation of the group exposure of subpopulation, represented by members of a university catering establishment. Since a homogenous group was observed, the values obtained indicate an average exposure to exp 226 Ra in the members of public catering establishments. The calculated values for the annual dose equivalent of exp 226 Ra to the skeleton in adults were 2.48 mrem, with the corresponding commitment of dose equivalent being 0.119 rem; these values are small in view of the above-mentioned annual exp 226 Ra intake, but the recommendations of ICRP indicate that they are not negligible. (ERA citation 08:013095)