Performance of Model 7FE Charcoal Filter for the Removal of Airborne Radioiodine:1. In-place Test for the Design of Air Cleaning System at Iodine-131 Production Facilities

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概要

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• In order to obtain data useful for the design of an air cleaning system at iodine-131 production facilities, the model 7FE charcoal filter (manufactured by Barnebey-Cheney Co., U.S.A.) installed in the exhaust air cleaning system at the lodine-131 Test Production Plant, JAERI was examined for performance for the removal of airborne radioiodine by using the airborne iodine-131 discharged into the exhaust system during the processing, the concentration of which ranges from 10<SUP>-5</SUP>to 10<SUP>-8</SUP>μCi/cc.<BR>The results obtained are summerized as follows:<BR>(1) Removal efficiency over a short period of 30 min at any time after the start of processing decreases with time, due to the increasing desorption of iodine; i. e. it maintains 97% on the average from the start to the first 2 hr independently of the relative humidity of the exhaust air, whereas from 8 hr after the start it decreases from about 95% to about 5% as the relative humidity is increased.<BR>(2) Removal efficiency as determined for long periods more than 5 hr after the start of processing depends greatly on the relative humidity; i. e. at relative humidity of less than 50% the removal efficiency over 24 hr after the start exceeds 90%, whereas at relative humidity of more, than 70% it decreases to 85%.<BR>(3) By installing the model 7FE charcoal filter in place of an absolute filter, an amount of iodine 131 discharged from the stack reduces to 1/20 on the average.<BR>(4) No appreciable deterioration of the performance for the removal of airborne iodine-131 is found through one year of continuous exposure to exhaust ventilation air from the Iodine-131 Test Production Plant.

• 日本保健物理学会の論文

著者

• 成富 満夫

  日本原子力研究所 保健物理安全管理部

• 福田 整司

  日本原子力研究所

• 福田 整司

  日本原子力研究所保健物理安全管理部

• 井沢 庄治

  日本原子力研究所保健物理安全管理部

• 井沢 庄治

  日本原子力研究所

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