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 10.12P
To determine
The thickness of the lead shield.
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Estimate the exposure rate 2 m from 4 Ci sources of 57Co,22Na,65Zn?Exposure Rate constant for 57Co=0.9 (R.cm2) / (hr.mCi)Exposure Rate constant for 22Na =12 (R.cm2) / (hr.mCi)Exposure Rate constant for 65Zn =2.7 (R.cm2) / (hr.mCi)
If 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?
A worker will need to conduct a repair to a pipe containing radioactive waste. The pipe is 10 m
long, and the worker will need to be standing 50 cm from the pipe. A remote detector was
used to take a reading of 1.5 R/hr at 3 m from the pipe.
a) What is the dose rate at the work position?
b) If the worker's dose limit is 30 rad, how long will he have to complete the work?
Assume that there is no dose from approaching and leaving the work location.
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- 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_forwardFrom the average of these values, determine the maximum number of hours you could work with this material in a year if the annual maximum permissible dose is 2.4 mSv and you count with 200 working days in a yeararrow_forward60Co is in an Iron container. The unshielded equivalent dose rate at 1 meterfrom the source is 2 mGy/h. What must be the thickness of Iron to meet thelegal limit of 100 μSv/h?.arrow_forward
- If the dose rate from a sample of Ra-223 was found to be 5.0 x 10-5 mSv per hour at 1.8 metres, calculate the dose rate at 4.8 metres. Show your calculations. Give your answer to two significant figures.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_forwardThe exposure rate at 1 meter from a point source of 10 mCi of 137CS is(r for 137CS is 3.3 R.cm2/mCi.hr)arrow_forward
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- The 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_forwardgiven 4hrs of 80dBA exposure ,2hrs of90 dBA exposure and 2hrs of 85 dBA exposure,what is the % dose? is this person overexposed to noisearrow_forward
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