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 10.14P
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Gamma-ray dose rate from the bolt
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A person is to work in a mixed field consisting of 5mGy/h of gamma radiation, 1.0 mGy/h of beta radiation, 0.5 mGy/h of fast neutrons and 0.8 mGy/h of slow neutrons. How long can he work for without exceeding a whole-body dose limit recommended by ICRP? (The quality factors for fast and slow neutrons are 10 and 5 respectively.)
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A particular radioactive source produces 100 mrad of 2-MeV gamma rays per hour at a distance of 1.0 m. (a) How long could a person stand at this distance before accumulating an intolerable dose of 1 rem? (b) Assuming the gamma radiation is emitted uniformly in all directions, at what distance would a person recieve a dose of 10 mrad/h from this source?
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- Calculate the dose in Sv to the chest at a patient given an xray under the following conditions. The xray beam intensity is 1.50 W/m2, the area of the chest exposed is 0.0750 m2 35.0% of the xrays are absorbed in 20.0 kg of tissue, and the exposure time is 0.250 s.arrow_forwardWhat is the dose in mSv for: (a) a 0.1 Gy xray? (b) 2.5 mGy of neutron exposure to the eye? (c) 1.5 mGy of exposure?arrow_forwardFind the radiation dose in Gy for: (a) A 10-mSv fluoroscopic X-ray series, (b) 50 mSv of skin exposure by an a emitter, (c) 160 mSv of and rays from the 40K in your body.arrow_forward
- Find the radiation dose in Gy for: (a) A 10mSv fluoroscopic xray series. (b) 50 mSv of skin exposure by an emitter. (c) 160 mSv of and rays from the 40K in your body.arrow_forwardSuppose one load irradiation plant uses a 137Cs source while another uses an equal activity of 60Co. Assuming equal fractions of the (rays from the sources are absorbed, why is more time needed to get the same dose using me 137Cs source?arrow_forwardWhat is the dose in mSv for: (a) a 0.1-Gy X-ray? (b) 2.5 mGy of neutron exposure to the eye? (c) 1.5m Gy of a exposure?arrow_forward
- Data from the appendices and the periodic table may be needed for these problems. Show that the activity of the 14C in 1.00 g of 12C found in living tissue is 0.250 Bq.arrow_forwardA beam of 168MeV nitrogen nuclei is used for cancer therapy. If this beam is directed onto a 0.200kg tumor and gives it a 2.00Sv dose, how many nitrogen nuclei were stopped? (Use an RBE of 20 for heavy ions.)arrow_forwardHow many Gy of exposure is needed to give a cancerous tumor a dose of 40 Sv if it is exposed to acfivity?arrow_forward
- You are using a Cs-137 radiation source with an "activity" level of 5 μCi that emits primarily beta particles with energy 0.5120 MeV. Use the equation given to calculate the total beta-radiation exposure you would experience in 3 hours of lab work with this radioactive source. (H) is the equivalent dose rate in mrem/hr, (A) is the activity of the sample in Ci, (E) is the energy of the emitted radiation in eV, and (r) is the average distance from the source during the exposure in meters. To find the radius, use a reasonable distance - as if you were working with an experimental apparatus and radioactive sources in person during these three hours (how far, on average, would you be from the source during that time?). For comparison, you would be exposed to approximately 3.5 millirems if you were to fly from the east coast to the west coast of the US.arrow_forwardEquivalent Dose = Absorbed Dose x Radiation weighting factor HT = DX WR re some Radiation weighting factors: ation Tyne Radiation weighting factor (Wol RBE - Dose of standard radiation required to produce an effect (Dref) Dose of radiation being tested to produce the SAME effect (Dr) RBE = Dref Dr Definition of Exposure . • • • The interaction of radiation waves with particles of air results in charged ions. Exposure is defined as the quantity of charged ions per unit mass of air. E = m Unit of exposure is Ckg1 (coulomb per kilogram) E is exposure Q is the quantity of charge on the ions (Coulomb, C) m is the unit mass of air (Kilograms, kg)arrow_forwarda) A patient receives an absorbed dose of 0.045 mGy of alpha radiation. The radiation weighting factor of the radiation is 20. Calculate the equivalent dose received by the patient. b) A worker in a nuclear power station receives the following radiation exposures to all parts of their body while working in one year: 1.5 mGy of slow neutrons, with a radiation weighting factor, WR, of 5 and 2.0 mGy of gamma rays with a WR of 1. What is the effective dose that the worker has absorbed?arrow_forward
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