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Doses from Radiation exposure
The Task Group on Internal Dosimetry (INDOS) recently completed work for Publication 95 on doses to infants from the transfer of radionuclides in breast-milk. This followed from Publication 88 on doses to the embryo, fetus and newborn child from intakes of radionuclides by the mother and completed a series of publications giving dose coefficients for intakes of radionuclides by infants, children and adults.
With the forthcoming publication of new recommendations by ICRP the emphasis of the work of C2 on internal dosimetry is now concerned with occupational exposure. It is intended to replace Publications 30 and 68, that give biokinetic data and dose coefficients for intakes of radionuclides by inhalation and ingestion, and Publications 54 and 78, that give information for bioassay interpretation, with a single series of publications. The first report will cover radionuclides of the 31 elements covered in the series of publications on dose coefficients for the public. Biokinetic models are being reviewed and updated as appropriate. The new ICRP model of the human alimentary tract will be used and revisions to the Human Respiratory Tract Model are being considered. Doses will be calculated using revised nuclear decay data and new anatomical phantoms (see Task Group on Dose Calculations, DOCAL).
The publications on occupational exposure will be accompanied by a supporting Guidance Document (GD) that will give advice on the interpretation of bioassay data. Recent inter-laboratory comparisons have shown variations in the way that bioassay data can be interpreted in different laboratories and have demonstrated the need for improved guidance. In addition to the data for bioassay interpretation given in previous publications, tables of “dose per unit content” are proposed. These will give effective dose directly as a function of measured activity in body tissues or excreta. This should facilitate the assessment of doses from bioassay data. A consultation draft of the GD was posted on the ICRP web-site in January 2006.
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