Gamma radiation effects on time-dependent iodine partitioning
A need for characterization of the iodine source term used in safety calculations for hypothesized light water reactor core disruptive accidents has motivated a study in iodine volatility. Previous experimental studies have been directed at evaluating volatility of iodine at a single time shortly (1 to 12 h) after introduction into the aqueous phase. The very important variables of time in solution and gamma radiation dose rate for a range of iodine concentrations (10/sup -8/ to 10/sup -5/ gI/ml) and pHs (5, 9, and 11) are explored. All experiments were performed at --25/sup 0/C, first in the absence of a significant radiation field and later with a gamma radiation dose rate ranging from 0.003 to 0.06 Mrad/h. Iodine was introduced as either molecular I/sub 2/ or NaI with /sup 131/I (8.04-day half-life) as a tracer. Results of experiments with nonirradiated systems indicated very little volatility with NaI-initiated studies. The I/sub 2/-initiated systems at pH 5 were the most volatile whereas experiments at pH 9 and 11 showed decreasing iodine volatility with time. From the experiments at pH 9, it is inferred that the partition coefficient of HOI is -- 1000.
- Research Organization:
- Sachs/Freeman Associates, Landover, MD
- OSTI ID:
- 6593774
- Journal Information:
- Nucl. Technol.; (United States), Vol. 76:3
- Country of Publication:
- United States
- Language:
- English
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IODINE
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PHYSICAL RADIATION EFFECTS
SOURCE TERMS
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REACTOR CORE DISRUPTION
REACTOR SAFETY
COMPUTERIZED SIMULATION
DOSE RATES
GAMMA RADIATION
IODINE 131
PH VALUE
RADIOLYSIS
SODIUM IODIDES
TIME DEPENDENCE
TRACER TECHNIQUES
VOLATILITY
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ALKALI METAL COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DAYS LIVING RADIOISOTOPES
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN COMPOUNDS
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INTERMEDIATE MASS NUCLEI
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IODINE ISOTOPES
IONIZING RADIATIONS
ISOTOPE APPLICATIONS
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NUCLEI
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OXYGEN COMPOUNDS
PHOSPHORS
RADIATION CHEMISTRY
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RADIOISOTOPES
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