Basic Physics of Nuclear Medicine/The Radioactive Decay Law MCQ

{1 MBq is equal to: |type="()"} - 1 billion decays per second - 37 thousand, million curies - 1 decay per second + 1 million decays per second || Correct Answer - see Units of Radioactivity. {The Half Life of 99m-Tc is 6 hours. After how much time will one eighth of the radioactivity in a sample remain? |type="()"} - 6 hours - 12 hours + 18 hours || Correct Answer - see Half Life. - 24 hours {The Half Life is: |type="()"} - the reciprocal of the Decay Constant + the time taken for the number of radioactive nuclei to decrease by a factor of 2 || Correct Answer - see Half Life. - the time taken for the number of radioactive nuclei to increase by a factor of 2 - the Decay Constant multiplied by the natural logarithm of 2 {The Decay Constant is a measure of: |type="()"} - only the number of alpha particles emitted - only the number of beta particles emitted - only the number of gamma rays emitted + none of the above || Correct Answer - see The Radioactive Decay Law. {If ln x = y, then: |type="()"} - ln y = x + exp y = x || Correct Answer - see The Radioactive Decay Law. - exp y = -x - exp -y = x {When the Half Life increases: |type="()"} - the Decay Constant increases + the Decay Constant decreases || Correct Answer - see Relationship between the Decay Constant and the Half Life. - the Decay Constant remains unchanged - none of the above happen {A linear relationship is obtained between the number of radioactive nuclei and time when it is plotted: |type="()"} - on a log-log graph + on a log-linear graph || Correct Answer - see The Radioactive Decay Law. - on a linear-linear graph - on a square-linear graph {The number of nuclei which decay between t and t+dt is proportional to: |type="()"} - the number of nuclei only - the time interval only - the quotient of the number of nuclei and the time interval + the product of the number of nuclei and the time interval || Correct Answer - see The Radioactive Decay Law. {The Radioactive Decay Law is expressed by: |type="()"} + an exponential function || Correct Answer - see The Radioactive Decay Law. - a logarithmic function - a sinusoidal function - a linear function {When the Decay Constant increases: |type="()"} + the Half Life decreases || Correct Answer - see Relationship between the Decay Constant and the Half Life. - the Half Life increases - the Half Life remains unchanged - none of the above happen