Introduction To Health Physics
Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 10, Problem 10.16P
To determine

The thickness of lead shield in spherical shape.

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The linear attenuation coefficient for 2.0-MeV gamma rays in water is 4.9 m-1 and 52 m-1 in lead.  What thickness of water would give the same shielding for gamma rays as 15 mm of lead?
A beam of 5.0 MeV alpha particles (q-2e) has a cross-sectional area of 1.50 cm2. It is incident on flesh (p-950 kg/m³) and penetrates to a depth of 0.70 mm. a) What dose in Gy does the beam provide to the flesh in a time of 3.0 s? b) What effective dose does it provide? Assume the beam to carry a current of 2.50 x 109 A and to have QF - 14.
During a routine Radiation Therapy procedure of Mr. X, the radiation dose at particular points at the trajectory of the beam towards the lesion is as follows 1. 15 MV 2. 10 MV 3. 8 MV 4. 6 MV 5. 5MV 6. 3 Mv 7. 2MV 8. 1 MV with the reference dose being the 5th, compute for the PDD of the beam at all points of the beam preceding the Dmax
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