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 10, Problem 10.7P
To determine
The thickness of Lucite sleeve, so that no beat particles are to come through the Lucite.
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- The C14 with an activity of 10 Ci is in a 1.0 mm thick lead box. Calculate the number of beta particles per second at just outside of the box.arrow_forwardA dose-response curve is generally shaped as a(n) __________.A.inverted VB.SC.inverted UD.Uarrow_forwardThe maximum permissible workday dose for occupational exposure to radiation is 26 mrem. A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage? O 0.23 0.28 O 0.30 0.25arrow_forward
- An x-ray technician works 5 days per week, 50 weeks per year. (Assume that the technician takes an average of six x-rays per day and receives a dose of 4.1 rem/yr as a result.) (a) Estimate the dose in rem per x-ray taken. (b) How does this result compare with the amount of low-level background radiation the technician is exposed to? Assume that low-level radiation from natural sources, such as cosmic rays and radioactive rocks and soil, delivers a dose of approximately 0.13 rem/year per person. __________times the normal background levelarrow_forwardA 4-MV linear accelerator is installed 3 meters from a 150-cm thick wall of concrete separating the treatment room from an automatic elevator. The accelerator treats 150 patients per week with an average isocenter dose of 200 cGy. What is the transmitted dose to the elevator? What is the minimum thickness of concrete necessary to keep the dose below the maximum level?arrow_forwardA 73.0 kg person experiences a whole-body exposure to alpha radiation with an energy of 1.50 MeVMeV. A total of 5.40×1012 alpha particles is absorbed. Use the Table of Relative biological effectiveness (RBE) for several types of radiation. A) What is the absorbed dose in rad? Express your answer in rads. B) What is the equivalent dose in rem? Express your answer in rem. C) If the source is 0.0100 gg of 226Ra (half-life 1600 years) somewhere in the body, what is the activity of the source? Express your answer in decays per second. D) If all the alpha particles produced are absorbed, what time is required for this dose to be delivered? Express your answer with the appropriate units.arrow_forward
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