Radium-226 whole-body gamma counting and 222Rn breath analysis: report on a subject exposed to uranium mill tailings

Area of Science:

• Environmental Health
• Radiological Science
• Pediatric Oncology

Background:

• Childhood leukemia is a serious concern, and environmental factors are investigated as potential causes.
• Uranium mill tailings are known sources of radioactive materials, including radium-226 (226Ra).

Purpose of the Study:

• To assess the 226Ra body burden and potential radium intake in a male diagnosed with leukemia who had childhood exposure to uranium mill tailings.
• To estimate the alpha particle dose to the red marrow and compare it with known leukemia-inducing doses.

Main Methods:

• Case study comparing an exposed individual with a matched control subject.
• Gamma spectrometry and radon (Rn) breath analysis were used to measure 226Ra body burden.
• Alpha particle dose estimation to red marrow was calculated based on 226Ra and its decay products.

Main Results:

• The exposed subject's 226Ra body burden was within the normal range for individuals with typical dietary intake, indicating no significant mill tailings uptake.
• Radon breath measurements also showed no significant difference between the exposed and control subjects.
• Estimated alpha particle doses to the red marrow were low (0.05 mGy at age 14, 0.10 mGy at age 38).

Conclusions:

• The leukemia in the exposed subject was unlikely caused by radium uptake from uranium mill tailings.
• The estimated radiation dose was significantly lower than that observed in historical cases of radium-induced leukemia, such as dial painters.