Problem 67E

Nuclear Power and Radioisotopes (Sections)

A laboratory rat is exposed to an alpha-radiation source whose activity is 14.3 mCi.

(a) What is the activity of the radiation in disintegrations per second? In becquerels? (b) The rat has a mass of 385 g and is exposed to the radiation for 14.0 s, absorbing 35% of the emitted alpha particles, each having an energy of 9.12 × 10-13 J. Calculate the absorbed dose in millirads and grays., (c) If the RBE of the radiation is 9.5, calculate the effective absorbed dose in mrem and Sv.

PSYCH STATS POWERPOINT 9 ● t statistic ● when we set a = .05, this result will only occur at random 5% of the time ○ we are 95% sure our result didn’t occur by chance ● df = (n-1) ● standard error indicates the variability in M ● we use z-scores to test our hypothesis ● with t-statistics, we don’t have certain information ● confidence intervals = give us an idea of how well our numbers are at estimating the values ● we rarely know the SD ○ we use “s” to estimate the standard deviation ■ the sample standard deviation has sampling variability ● t-statistic = used to test hypotheses about a