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 5.33P
To determine

The reduction in intensity of the cosmic ray.

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Some satellites use nuclear power. (a) If such a satellite emits a 1.00-W flux of y rays having an average energy of 0.500 MeV, how many are emitted per second? (b) These y rays affect other satellites. How far away must another satellite be to only receive one y ray per second per square meter?
Suppose that the microwave radiation has a wavelength of 11.6 cm. How many photons are required to heat 265 mL of coffee from 25.0 degrees Celcius to 62.0 degrees Celcius? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 J/(g.K), as water over this temperature range.
During X-ray diagnostics, lead aprons made of a thin layer of lead are used in order to protect against the harmful effects of X-ray radiation. Determine, by what factor is the intensity of X-ray radiation reduced after passing the apron of thickness 1 mm. The mass attenuation coefficient for a radiation source with an energy of 140 keV is µm= 2 cm²/g. Density of lead p=11.35 g/cm³.
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