Conclusions
The large number of cases available for this study permitted the development of an algorithm to simply determine patient-specific radiation safety instructions. The resulting precaution times are significantly less restrictive than those generally prescribed currently.
Purpose
To use radiation exposure rate measurements to determine patient-specific radiation safety instructions with the aim of reducing unnecessary precaution times and to evaluate potential doses to members of the public.
Results
The median air kerma rates at 30 cm from the anterior skin surface were 4.9 microGy/h (range: 0.1-31.5) for (125)I and 1.5 microGy/h (range: 0.02-14.9) for (103)Pd. The derived algorithms depended primarily on the half-life T(p), the measured exposure rate at 30 cm, and specific exposure situation factors. For the typical (103)Pd patient, no radiation safety precautions are required. For the typical (125)I patient, no precautions are required for coworkers, nonpregnant adults who do not sleep with the patient, or nonpregnant adults who sleep with the patient. Typical (125)I patients should only avoid sleeping in the "spoon" position (i.e., in contact) with pregnant adults and avoid holding a child for long periods of time in the lap for about 2 months. Conclusions: The large number of cases available for this study permitted the development of an algorithm to simply determine patient-specific radiation safety instructions. The resulting precaution times are significantly less restrictive than those generally prescribed currently.