Levels of natural radionuclides in human excreta in the Berlin area.
Intakes of Radionuclides : Occupational and Public Exposure. Workshop. Avignon, FRA, 1997/09/15.
The determination of radionuclides in human excreta is one method for monitoring the internal exposure of workers handling radioactive material.
For the purposes of calculating the internal dose from such exposures one has to consider the natural background caused by the ubiquitous but area-dependent exposure to natural radionuclides.
This is especially true of monitoring of the exposure to long-lived natural radionuclides of the 238U and 232Th series.
To get a first impression of the natural background of some of these radionuclides the amount of various natural radionuclides present in faeces and urine of non-exposed persons from Berlin were measured.
In the faecal samples, each collected over a period of 24 h, the following levels were found : uranium ranged from 0.4 to 2.2 mugFd-1 mean 1.4 mug. d-1 226Ra from 38 to 121 mBq. d-1, mean 65 mBq. d-1,210Pb from 52 to 185 mBq. d-1, mean 111 mBq. d-1,232Th from 1.6 to 12 mBq. d-1, mean 5.4 mBq. d-1,230Th from 1.7 to 16 mBq. d-1, mean 9.8 mBq. d-1, and 228Th ranged from 11 to 39 mBq. d-1, mean 23 mBq. d-1.
Ten 24 h urine samples were analysed to determine 210Pb and 210Po.
Only one value for 210Pb and six for 210Po were above the detection limit of 6 mBq. l-1 and 2 mBq. l-1, respectively.
The highest value for 210Po was at 10 mBq. d-1.
Mots-clés Pascal : Berlin, Allemagne, Europe, Radioactivité naturelle, Excrétion, Homme, Monitorage, Dosimétrie, Limite détection, Exposition professionnelle, Produit radioactif
Mots-clés Pascal anglais : Berlin, Germany, Europe, Natural radioactivity, Excretion, Human, Monitoring, Dosimetry, Detection limit, Occupational exposure, Radioactive product
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0011342
Code Inist : 002A08F05. Création : 31/05/1999.