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 5.46P
To determine
The rate heat be removed from the target in order to have insignificant temperature rise.
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Gamma-ray detectors like the one described in the preceding problem often use calorimetry to determine gamma-ray energies. Suppose a beam of 100-MeV gamma rays strikes a target with a mass of 2.5 kg and specifi c heat 430 J/(kg # K). How many gamma rays are needed to raise the target’s temperature by 10 mK?
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Chapter 5 Solutions
Introduction To Health Physics
Ch. 5 - Prob. 5.1PCh. 5 - Prob. 5.2PCh. 5 - Prob. 5.3PCh. 5 - Prob. 5.4PCh. 5 - Prob. 5.5PCh. 5 - Prob. 5.6PCh. 5 - Prob. 5.7PCh. 5 - Prob. 5.8PCh. 5 - Prob. 5.9PCh. 5 - Prob. 5.10P
Ch. 5 - Prob. 5.11PCh. 5 - Prob. 5.12PCh. 5 - Prob. 5.13PCh. 5 - Prob. 5.14PCh. 5 - Prob. 5.15PCh. 5 - Prob. 5.16PCh. 5 - Prob. 5.17PCh. 5 - Prob. 5.18PCh. 5 - Prob. 5.19PCh. 5 - Prob. 5.20PCh. 5 - Calculate the probability that a 2-MeV photon in a...Ch. 5 - Prob. 5.22PCh. 5 - Prob. 5.23PCh. 5 - Prob. 5.24PCh. 5 - Prob. 5.25PCh. 5 - Prob. 5.26PCh. 5 - Prob. 5.27PCh. 5 - Prob. 5.28PCh. 5 - Prob. 5.29PCh. 5 - Prob. 5.30PCh. 5 - Prob. 5.31PCh. 5 - Prob. 5.32PCh. 5 - Prob. 5.33PCh. 5 - Prob. 5.34PCh. 5 - Prob. 5.35PCh. 5 - Prob. 5.36PCh. 5 - Prob. 5.37PCh. 5 - Prob. 5.38PCh. 5 - Prob. 5.39PCh. 5 - Prob. 5.40PCh. 5 - A 1-M solution of boric acid, H3BO3 , is...Ch. 5 - Prob. 5.42PCh. 5 - Prob. 5.43PCh. 5 - Prob. 5.44PCh. 5 - Prob. 5.45PCh. 5 - Prob. 5.46PCh. 5 - Prob. 5.47PCh. 5 - Prob. 5.49PCh. 5 - Prob. 5.50PCh. 5 - Prob. 5.54PCh. 5 - What is the range in tissue of the beta particles...Ch. 5 - Prob. 5.56P
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- a. A dental x-ray machine has a 60 kV accelerating voltage and a tungsten target. Atypical exposure uses an 8.0 mA electron current for 18 s. What is the approximatepower of the x-ray emission? The conversion efficiency is not known precisely, so aone-significant-figure answer is appropriate. b. What is the x-ray intensity at the jaw, 15 cm from the source? Assume that the x raysare emitted uniformly in all directions from a single point. c. A molar tooth can be approximated as a 9-mm-diameter, 20-mm-long cylinder. X raysimpinge on a molar from the side, perpendicular to the axis of the cylinder. Approxi-mately what x-ray energy enters a molar during the exposure?arrow_forwardDuring the deep X-ray therapy high energy X-rays are used. They are filtered by passing themthrough copper and aluminium plates. If the copper plate has thickness ?1 = 1 mm and aluminiumplate ?2 = 5 mm, find reduction in X-ray beam intensity. Linear attenuation coefficients for copperand aluminium are ?1 = 0,32 cm –1, and ?2 = 0,15 cm –1, respectively.arrow_forwardA “clever” technician decides to heat some water for his coffee with an x-ray machine. If the machine produces 10 rad/s, how long will it take to raise the temperature of a cup of water by 50°C? Ignore heat losses during this time.arrow_forward
- Typical 10-fold intensity reduction values for X-ray radiation with energy 1 MeV are 30 cm for bone tissues, 20 cm for aluminum, 5 cm for lead. Find mass and linear attenuation coefficients if densities are 1.85 g/cm3, 2.70 g/cm3, 11.35 g/cm3, respectively.arrow_forwardLead aprons are the primary radiation protective garments used by personnel during fluoroscopy. An apron with 0.5-mm thickness can attenuate approximately 90% of the X-rayradiation. Find linear and mass attenuation coefficients for lead, if it has density ρ = 11.35 g/cm3arrow_forwardFind required thickness of the protective lead shield in order to achieve 99 % reduction ofX-Ray radiation intensity. The mass attenuation coefficient for a radiation source with an energy of140 keV is μm = 2.32 cm2/g. Density of lead ρ = 11.35 g/cm3.arrow_forward
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