Assessmnt of Occupational Exposure to Extl Srcs of Radiation
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Additional resources for Assessmnt of Occupational Exposure to Extl Srcs of Radiation (IAEA RS-G-1.3)
The records should include the results of individual monitoring for both external radiation and intakes of radioactive material. 4. Modern individual monitoring services for external radiation, particularly the larger ones, have adopted a high degree of automation, often using fully integrated systems linking the dose record keeping to the labelling and issuing of dosimeters and their subsequent dose assessment. Such automated systems, especially if the 37 dosimeters are labelled with the wearer’s name (thus providing a further line of defence against errors in issuing dosimeters), offer a high degree of integrity — and hence quality — to the service being provided.
4. Skin contamination is never uniform and occurs preferentially on certain parts of the body, notably the hands. For routine control purposes, it is adequate to regard the contamination as being averaged over areas of about 100 cm2. Routine monitoring for skin contamination should therefore be interpreted on the basis of the average 45 dose equivalent over an area of 100 cm2. In most monitoring for skin contamination, the reading is compared with a derived limit — a level expressed in units of, say, Bq/cm2 which is considered to be capable of causing exposure equal to the relevant dose limit, and is usually established taking account of all potential exposure pathways (not just skin irradiation) — and the contamination is reduced when practicable.
This level should never be significantly above normal local background. g. using control dosimeters); these levels may be used in the routine monitoring programme to determine net doses by subtracting the background contribution. Dosimetry service records should include the results of routine background measurements. 12. The workplace controls should be adequate to ensure that no equipment or dosimeters are subjected to conditions likely to affect their performance. Factors that should be controlled include temperature, humidity, light levels, dust and reactive chemical vapours.