{sup 125}I Measurements for Occupational Exposure Assessment
- Department of Radiological Protection and Nuclear Safety, ITN-Nuclear and Technological Institute, Estrada Nacional N 10, 2686-953 Sacavem (Portugal)
Whenever there is a risk of occupational exposure to dispersible radioactive material, it is necessary to have a monitoring program to assess the effective dose arising from the intake of radionuclides by workers. In this paper we present our experience in bioassay measurements of {sup 125}I in urine samples of workers using high resolution gamma spectrometry. For a 24-hour excretion period, we found activity values of the order of one Bq and estimated the committed effective doses to be less than one {mu}Sv. Although very small, these values led to a re-evaluation and improvement of the laboratory safety conditions. We discuss the calibration procedure followed for the activity measurements, the estimation of the uncertainty in the excreted activity, the calculation of detection and quantification limits and estimation of performance indicators. Aspects regarding the spectral analysis, true coincidence summing and matrix effects are also considered.
- OSTI ID:
- 21152371
- Journal Information:
- AIP Conference Proceedings, Vol. 1036, Issue 1; Conference: 1. international workshop on proficiency testing in applications of the ionizing radiation and nuclear analytical techniques in industry, medicine and environment, Bucharest (Romania), 6-9 Oct 2008; Other Information: DOI: 10.1063/1.2979078; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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