Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Question
Chapter 6, Problem 6.16P
(a)
To determine
The absorbed dose to the copper
(b)
To determine
The amount of charge formed by ionization in the cavity during the exposure
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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.)
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?
dont provode hand written solution
(Internal Exposure: Internal Radiation Dose) Given a 20µCi of 32p (T/2 = 14.3 days) is
delivered intravenously of a reference adult (70 kg). The biological half-life throughout the body
is 19 days. Calculate:
a. the absorbed dose constant (express your answer in erg/g t and Gy/t) for P-32
irradiating the whole body uniformly
b. total number of transformations that occur in the total body as a source organ; assume
that P-32 is metabolized wherein 40% is uniformly distributed to the whole body thus the initial
activity distributed in the total body is q, = 0.40 × 20µCi = 8µCi
c. the total body dose.
where t refers to the transformation number.
Note: 1 Joule = 107erg
Chapter 6 Solutions
Introduction To Health Physics
Ch. 6 - A 50-µC/kg (approximately 200 mR) pocket dosimeter...Ch. 6 - Prob. 6.2PCh. 6 - Prob. 6.3PCh. 6 - Prob. 6.4PCh. 6 - Prob. 6.5PCh. 6 - Prob. 6.6PCh. 6 - Prob. 6.7PCh. 6 - Prob. 6.8PCh. 6 - Prob. 6.9PCh. 6 - Prob. 6.10P
Ch. 6 - Prob. 6.11PCh. 6 - Prob. 6.12PCh. 6 - Prob. 6.13PCh. 6 - Prob. 6.14PCh. 6 - Prob. 6.15PCh. 6 - Prob. 6.16PCh. 6 - Prob. 6.17PCh. 6 - Prob. 6.19PCh. 6 - Prob. 6.20PCh. 6 - Calculate the average power density, in watts per...Ch. 6 - Prob. 6.22PCh. 6 - Prob. 6.23PCh. 6 - Prob. 6.24PCh. 6 - Prob. 6.26PCh. 6 - Prob. 6.27PCh. 6 - Prob. 6.28PCh. 6 - Prob. 6.29PCh. 6 - Prob. 6.33P
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- What 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_forwardData 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_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_forward
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- ✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVarrow_forwardConsider the region close to a nuclear reactor that produces large fluxes of prompt gamma rays with energies of about 7 MeV. Use the graph below, showing the mass attenuation coefficient of gamma rays in different stopping media as a function of energy, to determine the approximate thickness of lead shielding which would be required to reduce the gamma flux by a factor of 101º. The density of lead is 11.3 g cm. 10 5 Pb 0.5 0.1 Pb 0.05 Cu AL 0.01 0.01 0.05 0.1 0.5 1 5 10 50 100 Energy (MeV) Attenuation coefficient (cm²g")arrow_forwardAn 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_forward
- During a diagnostic x-ray examination a 1.2 kg portion of a broken leg receives an equivalent dose of 0.40 mSv. (a) What is the equivalent dose in mrem? (b) What is the absorbed dose in mrad and in mGy? (c) If the x-ray energy is 50 keV, how many x-ray photons are absorbed?arrow_forwardAn x - ray technician works 5 days per week, 50 weeks per year. Assume the technician takes an average of eight x - rays per day and receives a dose of 5.0 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?arrow_forwardA reactor is developing nuclear energy at a rate of 32000 kW. How many atoms of Uranium U235 undergo fission per second? How many kilogram of U 235 would be used up in 500 hours of operation? Assume the average energy of 200 MeV released per fission. Take Avogadro’s number 6x1023 and 1 MeV = 1.6x10-13 joule.arrow_forward
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