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 9, Problem 9.27P
To determine

The fraction of the counts is lost due to the counter’s dead time.

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if a record sample has rate of 44100Hz, how many samples are required to capture 0.25s?
A 729 range meter is having an accuracy of ± 1.45% of FSD. Calculate the %error for a measurement of 1325 reading. (i)Accuracy= (ii) %Error=
25. A radiograph made with an exposure of 12 mA per minute has a density of 0.8 in the area of interest. It is desired to increase the density to 2.0 in this area. By reference to a characteristic curve of the film, it is found that the difference in log e between a density of 0.8 and 2.0 is 0.76. The antilogarithm of log 0.76 is 5.8 (relative exposure factor). What must the new exposure time be to produce a radiograph with a density of 2.0, assuming the first exposure time was 1 minute?
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