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e. n<br />
____ 230. A radioisotope of argon, Ar, lies below the "band of stability." One would predict that it decays via<br />
__________.<br />
a. neutron emission<br />
b. beta emission<br />
c. electron capture<br />
d. alpha emission<br />
e. fission<br />
____ 231. The half-life of Tc-99 is 2.13 10 5 years. What is the value of the specific rate constant, k?<br />
a. 3.25 10 -6 y -1<br />
b. 1.41 10 -6 y -1<br />
c. 4.69 10 -6 y -1<br />
d. 0.693 y -1<br />
e. 1.48 10 5 y -1<br />
____ 232. The specific rate constant for the decay of Tc-95 is 0.0346 h -1 . What is its half-life?<br />
a. 10.6 h<br />
b. 8.70 h<br />
c. 28.9 h<br />
d. 0.0499 h<br />
e. 20.0 h<br />
____ 233. The half-life of Sr-83 is 32.4 hours. How much of a 20.0-mg sample of Sr will be left after 75.0 hours?<br />
a. 3.68 mg<br />
b. 0.249 mg<br />
c. 4.02 mg<br />
d. 0.497 mg<br />
e. 4.62 mg<br />
____ 234. Which one of the following reactions represents fission?<br />
a.<br />
b.<br />
c.<br />
d.<br />
e.<br />
____ 235. Which one of the components of a light water reactor listed below is described by an incorrect function?<br />
Component Function<br />
a. moderator slows neutrons<br />
b. fuel supplies neutrons plus heat<br />
c. cooling system coolant for the reactor<br />
d. control rods absorb some neutrons to control rate of<br />
fission<br />
e. shielding prevents the absorption of beta gamma rays<br />
by the fuel and cooling system
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