Abstract
radioactive isotopes of iodine are formed as fission products ; they are I131, I132, I133, and I135. Most of these have a short half -life and decay out within a few days (1, 2). The isotope of greatest importance is I131, a beta-gamma emitter, which has a half-life of 8.1 days (2). It is used widely as a tracer, particularly for diagnosis and treatment in medicine. Although I181 has a relatively short half-life, it is considered one of the more hazardous radioactive isotopes because it is concentrated in the thyroid gland upon ingestion. The maximum permissible concentrations (MPC) are given as 0.6 pc (microcuries) for the total body, and 6.0 X 10~5 /xc/ml in drinking water (3). It is desirable, therefore, to have an accurate analytical method for the detection and determination of this radioisotope in low concentrations in drinking water and in sewage effluent.
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