Monitoring of airborne contamination during the handling of technetium-99m and radioiodine

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Abstract
An air sampler was used to measure airborne radioactivity produced during the routine handling of large activities of 99mTc 125I and 131I. 99mTc was safely handled in environments without direct exhaust of the ventilated air, but 125I and 131I should always be handled in a ventilated environment, e.g., tume cupboard or a down-draught work-station of the total-exhaust type. Monitoring of thyroid uptake was the most reliable means of monitoring airborne contamination by these radionuclides. Burdens and radiation doses for typical procedures were well within the maximum permissible limits of the Code of practice for the Protection of Persons from Ionizing Radiation arising from Medical and Dental Use.

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