Testing Iodized Activated Carbon Filters with Non-Radio Active Methyl Iodide

Iodized carbons, impregnated with KIx(KI + xI2), were evaluated for trapping methyl iodide-127. In this method the complete effluent of the carbon is sampled and analyzed continuously. In contrast, the RDT-M16 test procedure counts the carbon and the back-up beds for the accumulated 131 species and...

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Bibliographic Details
Main Authors: Deitz,Victor R, Romans,James B
Format: Report
Language:English
Subjects:
ACTIVATED CARBON
Activated charcoal
AIR
Air purge
DESORPTION
DOSAGE
EMISSION SPECTRA
FILTERS
GAS CHROMATOGRAPHY
IODIDES
MEASUREMENT
Methyl iodide
METHYL RADICALS
Nonradioactivity
PENETRATION
Prehumidification
Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
RADIOACTIVE ISOTOPES
Radioactive methyl iodide
SCALING FACTOR
TEST METHODS
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Summary:Iodized carbons, impregnated with KIx(KI + xI2), were evaluated for trapping methyl iodide-127. In this method the complete effluent of the carbon is sampled and analyzed continuously. In contrast, the RDT-M16 test procedure counts the carbon and the back-up beds for the accumulated 131 species and no information is obtained for the interaction of the large amount of carrier methyl iodide-127 with the iodized charcoal. The test apparatus to measure the penetration of methyl iodide-127 is described and the calibration procedures are detailed. Results are given for the penetration of methyl iodide-127 through new activated carbons, carbons in service, and exhausted carbons withdrawn from service. The reduction in trapping efficiency with service is accompanied by the development of a maximum in the concentration of methyl iodide-127 during the air purge after the dose period. This behavior has escaped notice with methyl iodide-131 due to the way that test is made. The chromatographic holdup of methyl iodide-127 by carbons in service, together with the subsequent slow desorption step, could result in a dilution of the penetration iodine to acceptable levels under some conditions encountered in plant filter operations. Errata sheet inserted. See also Rept. no. NRL-MR-4179 dated 27 Feb 80, AD-A084 559.