Radiation safety investigation and assessment on indoor air I-131 in the radioactive isotope production area

Abstract

As the distillation process occurring, the indoor air in the I-131 production area of the Nuclear Research Institue was intermittently sampled using the activated carbon cartridges. There were 206 air samples grabbed in year 2015 and then measured from a low-background gamma spectrometry to calculate the concentration. The results showed some noticible properties of the I-131 concentration at the research areas such as concentration-product correlation is low, maximum value may occur at any time and most of the measured concentrations were beyond limit. However, the individual internal exposure to I-131 for the radiation workers was so low.

Keyword: I-131, air sampling, internal exposure.