
Concept explainers
(a)
The relative proportions of the two groups after passing through 25 cm of water.
(a)

Answer to Problem 5.35P
The relative proportions of the two groups after passing through 25 cm of water is,
Explanation of Solution
Given:
Energy,
Energy,
Thickness,
Cross-section,
Cross-section,
Cross-section,
Cross-section,
Formula used:
The intensity of gamma beam through the absorber curve is,
Where,
x =Thickness
Calculation:
The number of Hydrogen atoms per cm3 is,
The number of Oxygen atoms per cm3 is,
For Energy,
The intensity is given by
For Energy,
The intensity is given by
The relative proportions of the two groups after passing through 25 cm of water is,
Conclusion:
The relative proportions of the two groups after passing through 25 cm of water is,
(b)
The relative proportions of the two groups after passing through a slab of lead of the same density thickness.
(b)

Answer to Problem 5.35P
The relative proportions of the two groups after passing through 25 cm of water is
Explanation of Solution
Given:
Energy,
Energy,
Density thickness,
Cross-section,
Cross-section,
Cross-section,
Cross-section,
Cross-section,
Cross-section,
Cross-section,
Cross-section,
Formula used:
The intensity of gamma beam through the absorber curve is,
Where,
x =Thickness
The thickness is given by,
Calculation:
The thickness is given by,
For energy 1 MeV
Number of Pb-204 atoms are,
So,
Number of Pb-206 atoms are,
So,
Number of Pb-207 atoms are,
So,
Number of Pb-208 atoms are,
So,
Thus,
The intensity is given by:
For energy 10 MeV
Number of Pb-204 atoms are,
So,
Number of Pb-206 atoms are,
So,
Number of Pb-207 atoms are,
So,
Number of Pb-208 atoms are:
So,
Thus,
The intensity is given by
The relative proportions of the two groups after passing through 25 cm of water is,
Conclusion:
The relative proportions of the two groups after passing through 25 cm of water is:
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Chapter 5 Solutions
EBK INTRODUCTION TO HEALTH PHYSICS, FIF
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