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 10, Problem 10.20P
(a)
To determine
The source strength for each of the sources.
(b)
To determine
Required thickness of lead shielding
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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_forwardThe (effective) dose to a patient can be measured in milli-Serverts (mSv) or expressed as the time taken to receive the equivalent dose from background radiation. A certain radiograph gives a 1.232 mSv dose which is equivalent to a background radiation dose of 32 weeks.a)How many days in 32 weeks? Give your answer as a whole number. b)Using the information for the radiograph in this question, calculate the UK daily background dose (in mSv/day). Give your answer to 5 decimal places and use it to this accuracy, if needed in subsequent calculations. c)Another radiograph has a 0.0054 mSv dose. Work out the equivalent background dose (in days) for this radiograph. Give your answer to 2 decimal places and use it to this accuracy in any subsequent calculations. d)How many hours is the number of days in part c) equivalent to? Give your answer to 2 decimal places.arrow_forwardA beam of 5.0 MeV alpha particles (q-2e) has a cross-sectional area of 1.50 cm2. It is incident on flesh (p-950 kg/m³) and penetrates to a depth of 0.70 mm. a) What dose in Gy does the beam provide to the flesh in a time of 3.0 s? b) What effective dose does it provide? Assume the beam to carry a current of 2.50 x 109 A and to have QF - 14.arrow_forward
- A Co-60 source gives a gamma dose rate of 120 μSv/h at 2.2 m away. At what distance (in meter) will the dose rate be 59 µSv/h? Provide your answer with 1 decimal place.arrow_forwardThe dosage of technetium-99m for a lung scan is 20. µCi /kg of body mass. How many millicuries of technetium-99m should be given to a 49 kg person (1 mCi = 1000uCi)? Suppose a person absorbed 46 mrad of alpha radiation.What would be the equivalent dose in millirems?arrow_forwardA patient is exposed to 210 rad of gamma rays. What is the dose the patient receives in rem? Express your answer using two significant figures. Dose = Η ΜΕ ΑΣΦ Submit Request Answer 0 ? remarrow_forward
- A point source of radioactive material produces a dose rate of 100 Gy/hr at 1 meter from the source. What would be the dose rate at 4 m from the source?arrow_forwardQ1arrow_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
- 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_forwardIf the gamma-ray dose rate is 50 mSv hr-1 at a distance of 1.0 m from a source, what is the dose rate at a distance of 10 m from the source?arrow_forwardry A 1-curie source is located just behind a shielding. If the shield has an HVL of 8 cm, how thick must the shielding be so that only 2 mCi reaches you- standing just on the other side? O 71.74 cm 78.98 cm O 88.54 cm O None of the given options. O 20.87 cm Question 10 At 3 ft from a source, the dose rate is 25 mrem/hr. How far away from the source should somebody so that the dose rate he receives is .01 mrem/hr? O None of the given options. O 125 feet O 100 feet 75 feet 2 ptsarrow_forward
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