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 5.3P
To determine

Comparison between electronic densities of a thick piece of aluminum and iron.

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Give an example of a nanomaterial with electron confinement in one dimension.
The number of silicon atoms per m' is 5 x 1028. This is doped simultaneously with 5 x 1022 atoms per m' of Arsenic and 5 x 1020 per m' atoms of Indium. Calculate the number of electrons and holes. Given that n,= 1.5 x 1016 m-3. Is the material n-type or p-type?
A Perspex (Lucite) phantom is used to calibrate a 6 MV photon beam. A cylindrical air ion chamber has a wall thickness (polystyrene) of 0.20 g/cm2 and an inner diameter of 5 mm. The ion chamber is placed at a depth of 5 cm in the phantom. The NxAion = 1.05 × 1010 R/C (T = 22 oC, P = 760 torr) for Co-60 for this chamber. Charge collected is 2.50 × 10-8C at P = 750 torr and T = 20.0 oC. The ion collection efficiency is 0.985. (a) Calculate the Ngas (Gy/C) for the chamber. (b) Calculate the absorbed dose (Gy) in Perspex at this depth. (c) What would be the absorbed dose (Gy) in water at approximately the same depth in a water phantom?
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