/sup 131/I emission problem: Bismuth Phosphate Plant

Technical Report · Wed Apr 06 04:00:00 EST 1955

OSTI ID:5767678

Browne, W G

In order to control the /sup 131/I emission from the T Plant ventilation stack to a maximum of 1.0 curie per day with the present processing equipment, the uranium metal processed must be cooled a minimum of 90 days with 100 days desirable. To process uranium metal with shorter cooling times will require silver reactor design improvements, revised product reduction procedures, and the adoption of dissolver operating techniques which will insure a controlled rate of gas evolution during metal dissolving. Of the eight iodine isotopes produced in the irradiation of uranium, either as fission products or as a result of the decay of fission products, only three of these (/sup 127/I, /sup 129/I, /sup 131/I) are of importance at the time the uranium is actually processed, since the remainder are of very short half-life and decay to noniodine isotopes. /sup 127/I and /sup 129/I isotopes account for the major portion of the iodine present in the dissolver solution. The /sup 131/I is a very small part of the total iodine present in dissolver solutions but, being of short half-life (8.14 days), it is responsible for most of the radioactivity due to iodine isotopes.

• Research Organization: Hanford Works, Richland, WA (USA)
• DOE Contract Number: AC06-76RL01350
• OSTI ID: 5767678
• Report Number(s): HW-36112; ON: DE86008642
• Country of Publication: United States
• Language: English

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