
Concept explainers
(a)
To plot:
The data given in the table and suggest the type of
(a)

Answer to Problem 5.14P
Beta and gamma radiation
Explanation of Solution
Calculation:
The graph is plotted for counting per min to the thickness of the absorber. The count for beta particle decreases rapidly and then after certain range it decreases slowly. The counts for beta particle approach zero. But, in the above diagram the count is not approaching zero because of gamma radiations.
Thus, the types of radiation according to the above curve is Beta and gamma radiation.
Conclusion:
The type of radiation suggested by the curve is Beta radiation.
(b)
The energy of the beta radiations.
(b)

Answer to Problem 5.14P
The energy of the beta radiations is,
Explanation of Solution
Given:
Range of beta particle,
Formula used:
The Energy of beta particle is,
Where,
Calculation:
From the graph plotted between the thickness and the count per min curve. The range can be estimated as,
The Energy of beta particle is,
Conclusion:
From the above graph the energy of beta radiation is
(c)
Whether gamma rays are present, the energy of gamma rays if present.
(c)

Answer to Problem 5.14P
Yes, the energy is 1.5 MeV.
Explanation of Solution
The attenuation of gamma ray can be described as,
As intensity observed initially is 1000. So,
For
For
For
For
For
For
For
For
For
For
For
For
For
For
So, mean is,
Thus, the energy corresponding to it is 1.5 MeV.
(d)
The isotope compatible with absorption data.
(d)

Answer to Problem 5.14P
The isotope compatible with above absorption data is 198Au.
Explanation of Solution
The isotope compatible with above absorption data is 198Au.
(e)
The equation fits the absorption data.
(e)

Answer to Problem 5.14P
Explanation of Solution
The equation fits the absorption data is,
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Chapter 5 Solutions
EBK INTRODUCTION TO HEALTH PHYSICS, FIF
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