Accession Number:

AD0633606

Title:

INJURY ACCUMULATION IN SHEEP DURING PROTRACTED GAMMA RADIATION,

Descriptive Note:

Corporate Author:

NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Report Date:

1966-03-24

Pagination or Media Count:

22.0

Abstract:

The study describes the injury accumulation and recovery in sheep exposed to Co60 gamma rays 23 LD5030 at dose rates of 0.5 to 3.9 Rhour. Immediately following the protracted exposure 165 R, no injury as defined by the lethality of a second exposure could be detected for those animals exposed to gamma radiation at dose rates of 0.5 and 0.95 Rhour. However, when animals were subjected to a similar total protracted exposure but at dose rates of 1.85 and 3.9 Rhour, significant amounts of injury could be detected immediately following the protracted exposure. Approximately 75 R 45 and 104 R 63 of the remaining injury was detected in animals exposed at dose rates of 1.95 and 3.9 Rhour, respectively. This suggests a threshold exposure rate, probably between 1.0 and 1.85 Rhour, for injury accumulation in sheep. Further experiments to relate the size of the conditioning exposure protracted to injury accumulation indicate that at an exposure rate of 3.6 Rhour, injury accumulation is a linear function of the total protracted dose. Author

Subject Categories:

  • Radiobiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE