| Popis: |
The computerized Statistical Analysis System (SAS) for probit analysis was used in analyzing radiation dose response data. Sixty female and 60 male Sprague‐Dawley rats, aged 80±5 days and weighing 200–250 g each, were randomly assigned to six groups of 10 animals each. Each rat received a single total‐body exposure (rads) of Co gamma radiation of 0, 675, 700, 725, 750, or 775 at a dose rate of 304 rads/min. Mortalities were recorded during a 30‐day interval. The probit LD 50(30) for wale rats was 733 (715–754) rads with a Chi‐square of 5.736 (df =3); values for females were 729 (712–750) rads with a Chi‐square of 3.757 (df = 3). When males and females were combined, the LD,50(30) was 731 (719–744) rads and the Chi‐square was 3.384 (df = 3). The probit analysis indicated that the individual populations of rrale and female rats, as well as their combined population. exhibited no significant deviations from normality. Further, the level of significance revealed that the combined population of male a... |
