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Dispersion of Iodine-131 Radioactive Airborne in the Chemical Form of CH3I, HOI and I2 from Radioisotope Production Facility Stack to The Environment

The purpose of this research is to develop a method for measuring radioactive release I-131 in the stack of isotope production facilities and in the environment (outdoor) in the form of: organic Iodine methyl Iodide (CH3I), elemental iodine (I2) and inorganic hypoiodous acid iodine (HOI). Charcoal filters are used to adsorb organic Iodine methyl Iodide (CH3I). Silver coated gauze is used to adsorb elemental Iodine (I2). Glass fiber paper filters are used to adsorb inorganic hypoiodous acid iodine (HOI). The discharge of I-131 activity concentrations on average from the stack and in seven outdoor places around the isotope production installation are still underneath the standard level within the air (530 Bq/m) based on controls of Nuclear Energy Supervisory Agency (BAPETEN) Head, No. 7/2013. The activity concentrations of I-131 in stack from large to small were CH3I (63.03%), I2 (30,27%) and HOI (7.70%) respectively. While average I-131 concentration in the outdoors were CH3I (61.12%), I2 (20.37%) and HOI (18.39%).