[Accidental contamination with cesium-137]

Area of Science:

• Medical Physics
• Radiological Health
• Nuclear Medicine

Background:

• Accidental internal and external contamination with radioactive isotopes can pose significant health risks.
• Cesium-137 (137Cs) is a common radioactive isotope resulting from nuclear fission, posing internal and external exposure hazards.

Observation:

• A 28-year-old woman experienced accidental internal and external contamination from handling unsealed Cesium-137 (137Cs) sources.
• Laboratory findings indicated leukopenia as the sole abnormality, with chromosome analysis of blood lymphocytes also performed.
• Cesium-137 (137Cs) excretion in urine ranged from 34.53 to 12.01 nCi/day between days 8 and 40 post-exposure.

Findings:

• The mean feces to urine excretion ratio for Cesium-137 (137Cs) was 0.25 +/- 0.06.
• Administration of diuretic 'Lasix' and potassium did not significantly increase Cesium-137 (137Cs) excretion in urine.
• The mean biological half-life of Cesium-137 (137Cs) was calculated at 64 days.
• Whole body counting estimated the initial Cesium-137 (137Cs) body burden at 6.9 muCi, with a total radiation dose of 0.26 rads.

Implications:

• This case highlights the importance of monitoring and managing accidental radioactive contamination.
• Understanding the biological half-life of Cesium-137 (137Cs) is crucial for assessing internal contamination and guiding treatment.
• The findings contribute to the knowledge base for radiological protection and emergency response protocols.