Dose-rate Measurements in the Rabbit Tibia following Uptake of Strontium 90

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Abstract
1. An account is given of an autoradiographic method of measuring radiation dose-rate in bone following uptake of 90Sr. 2. The dose-rate pattern in the upper half of the tibia of young and old rabbits given a single injection of 90Sr or fed daily pellets containing 90Sr is described. 3. The ratios maximum dose-rate/average dose-rate (non-uniformity factor) and maximum dose-rate/minimum dose-rate have been measured. For rabbits fed 90Sr from the age of five to eight weeks the greatest values of these ratios are 3·1 and 4 respectively. For rabbits given a single injection at the age of five to eight weeks they are 6 and about 70. For rabbits given a single injection aged one year and more they are 7 and 14. 4. It is concluded that the non-uniformity of radiation dose-rate for 90Sr as determined by the ratio maximum dose rate/average dose-rate is never great for the long bones. The greatest value found was 7.