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Regarding the half-life of a radio nuclide: a. It allows an estimation of how long it will take for a given sample to decay to half its activity b. The time taken for a given quantity to decay to half its activity reduces as the sample gets smaller c. Isotopes with a short half-life are considered more radioactive than those with longer half-lives d. Radio nuclides produced in a cyclotron are known to have shorter half-lives than those produced in a generator e. Tc-99m has a half-life of about 6 h |
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Answer» a. True. b. False. The activity of a radioactive sample decreases by equal fractions in equal time intervals (exponential law). c. False. The degree of radioactivity depends on the quantity of radioactive material at any given moment. d. False. Although cyclotron-produced radioisotopes generally have short half-lives, some such as Ga-67 and In-111 have longer half-lives than Tc-99m. e. True. |
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