Which of the following are true regarding radioactivity? a. The radio

1.	Which of the following are true regarding radioactivity? a. The radioactivity decay of a radio nuclide decreases by equal fractions (%) in equal intervals of time b. The rate of decay (activity of the radioactive material) is proportional to the count rate c. The count rate is always less than the radioactive decay rate d. The radioactive sample eventually decays completely, resulting in no activity e. The lower the number of radioactive atoms in a sample, the lower the rate of decay
Answer» a. True. This is referred to as the exponential law. b. True. The higher the rate of decay, the higher the number of gamma and beta particles produced. c. False. Some isotopes have multiple decay patterns producing a range of gamma rays. Examples include Ga-67 and I-131. d. False. The activity of a radio nuclide decreases exponentially and hence never reaches zero. e. True. The number of radioactive atoms in a sample is proportional to the rate of decay.

Which of the following are true regarding radioactivity? a. The radioactivity decay of a radio nuclide decreases by equal fractions (%) in equal intervals of time b. The rate of decay (activity of the radioactive material) is proportional to the count rate c. The count rate is always less than the radioactive decay rate d. The radioactive sample eventually decays completely, resulting in no activity e. The lower the number of radioactive atoms in a sample, the lower the rate of decay

Answer»

a. True. This is referred to as the exponential law.

b. True. The higher the rate of decay, the higher the number of gamma and beta particles produced.

c. False. Some isotopes have multiple decay patterns producing a range of gamma rays. Examples include Ga-67 and I-131.

d. False. The activity of a radio nuclide decreases exponentially and hence never reaches zero.

e. True. The number of radioactive atoms in a sample is proportional to the rate of decay.