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 5, Problem 5.20P

(a)

To determine

The thickness of the laminated shield.

(b)

To determine

The shield attenuation factor when:

  1. Aluminum layer is first
  2. Lead layer is first

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The mean free path length of a 0.7-MeV photon in lead is closest to which of the following? (a)0.1039 cm (b)0.6697 cm (c)0.7038 cm (d)1.1394 cm (e)0.8776 cm
During the deep X-ray therapy high energy X-rays are used. They are filtered by passing them through copper and aluminium plates. If the copper plate has thickness ?1 = 2 mm and aluminium plate ?2 =3 mm, find reduction in X-ray beam intensity. Linear attenuation coefficients for copper and aluminium are ?1 = 0.32 cm‐¹, and ?2 = 0.15 cm‐¹, respectively.
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