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 m3 is 5 × 1028. This is doped simultaneously with 5 × 1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni = 1.5 × 1016 m-3. Is the material n-type or p-type?
A germanium diode is used to detect radiation with energy of 1.6 MeV. To do so, the anode (positive terminal) is exposed to the incoming radiation. Assume that the energy is absorbed entirely at the point of entry or the anode. With mobilities of 1,150 cm?/V.s for holes and 3,750 cm?/V.s for electrons, calculate the current through the diode with reverse bias: V = 24 V and d = 12 mm. Neglect the effects of electrodes and 4. of the n and p layers and assume a single radiation event, that is a single particle or a short burst of radiation. (Charge of an electron = 1.602 x 10-19 C; d is the distance between anode and cathode).
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