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 5.18P

(a)

To determine

The thickness of Al and Cu required for HVL.

(b)

To determine

The thickness of Al and Cu required for TVL.

(c)

To determine

The relationship between an HVL and a TVL.

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Typical HVL values for X-ray radiation with energy 1 MeV are 3 cm for bone tissues, 2 cm for aluminum, 0.3 cm for lead. Find mass and linear attenuation coefficients if densities are 1.85 g/cm3 , 2.70 g/cm3 , 11.35 g/cm3, respectively.
For the intensity of a monochromatic beam of gamma rays to be reduced to 30% of its initial value, what thickness of a material is needed if it is measured in terms of the half-value layer for that material?
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 = 2.5 mm and aluminium plate ?2 =4 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. If a vial contains 400 MBq of fluorine-18 (F-18) at 12:00 on 20 March 2019, how much radioactivity will be present in the vial at 14:00 on 20 March 2019? Please input your answer in Bq and Ci.
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