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Unformatted text preview: MP200  Radiation Physics Fall 2010 Assignment 02 Due 09/22/10 ( Show your work for each problem. Partial credits are awarded.) 1. ( Problem # 02 on page 18 of Attix ) The following set of counts readings was made in a gradientfree ray field, using a suitable detector for repetitive time periods of one minute: 18500; 18410; 18250; 18760; 18600; 18220; 18540; 18270; 18670; 18540. (a) What is the mean value of the number of counts? (b) What is its standard deviation (S.D)? (c) What is the theoretical minimum S.D. of the mean? (d) What is the actual S.D. of a single reading? (e) What is the theoretical minimum S.D. of a single reading? 2. A point source of 60 Co gamma rays emits equal numbers of photons of 1 . 17 and 1 . 33 MeV , giving a flux density of 3 . 7 10 9 photons.cm 2 .sec 1 at a specified location. What is the energy flux density there, ex pressed in erg.cm 2 .s 1 and in J.m 2 .min 1 ? 3. ( Problem #08 on page 18 of Attix ) An X ray source at a point P contains 7 . 5 10 8 photons.m 2 .sec 1 .keV 1 , uniformly distributed from 10 keV to 100 keV . (a) What is the photon flux density at P ?...
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This note was uploaded on 10/30/2010 for the course MP 200 taught by Professor Guna during the Fall '10 term at Duke.
 Fall '10
 Guna

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