Basic Physics of Nuclear Medicine/The Radioactive Decay Law MCQ

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1 1 MBq is equal to:

1 billion decays per second
37 thousand, million curies
1 decay per second
1 million decays per second

2 The Half Life of 99m-Tc is 6 hours. After how much time will one eighth of the radioactivity in a sample remain?

6 hours
12 hours
18 hours
24 hours

3 The Half Life is:

the reciprocal of the Decay Constant
the time taken for the number of radioactive nuclei to decrease by a factor of 2
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

4 The Decay Constant is a measure of:

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

5 If ln x = y, then:

ln y = x
exp y = x
exp y = -x
exp -y = x

6 When the Half Life increases:

the Decay Constant increases
the Decay Constant decreases
the Decay Constant remains unchanged
none of the above happen

7 A linear relationship is obtained between the number of radioactive nuclei and time when it is plotted:

on a log-log graph
on a log-linear graph
on a linear-linear graph
on a square-linear graph

8 The number of nuclei which decay between t and t+dt is proportional to:

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

9 The Radioactive Decay Law is expressed by:

an exponential function
a logarithmic function
a sinusoidal function
a linear function

10 When the Decay Constant increases:

the Half Life decreases
the Half Life increases
the Half Life remains unchanged
none of the above happen