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Development of a routine 125I bioassay program for athyrotic individuals using a pseudo uptake retention function
Charles A Potter1, Todd A Culp
1Sandia National Laboratories, Albuquerque, NM 87185-0651, USA.
Health Physics
|March 22, 2002
Summary
Bioassays are crucial for iodine workers to assess exposure. A new urine bioassay protocol aids athyrotic individuals, those without a thyroid gland, in determining iodine intake and dose.
Area of Science:
- Occupational health
- Radiological protection
- Bioassay development
Background:
- Iodine production workers require bioassays to quantify intake and verify workplace controls.
- Thyroid monitoring is standard for detecting iodine isotopes, but ineffective for athyrotic individuals.
- Assessing iodine intake in athyrotic individuals necessitates alternative bioassay methods.
Observation:
- Previously published data on iodine absorption and retention in athyrotic individuals were re-evaluated.
- A pseudo uptake retention function was derived from existing data.
- The focus was on describing iodine excretion and calculating intake, not developing a full biokinetic model.
Findings:
- A pseudo uptake retention function was successfully derived for athyrotic individuals.
- This function was integrated with respiratory and gastrointestinal tract models for inhalation intake assessment.
- A periodic urine bioassay protocol was designed using the derived function and conservative dose coefficients.
Implications:
- This urine bioassay protocol provides a method for dose assessment in athyrotic individuals exposed to iodine.
- It enhances occupational health monitoring in iodine production facilities.
- The protocol supports regulatory compliance and verification of contamination control effectiveness.