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 13, Problem 13.3P
To determine
The standard deviation of the net counting rate.
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- The (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_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_forwardThe recommended adult dose of Elixophillin, a drug used to treat asthma, is 6mg/kg of body mass. Calculate the dose in milligrams for a 150lb person.arrow_forward
- Find the minimum sample size n needed to estimate μ for the given values of c, σ, and E. c=0.90, σ=8.9, and E=2 Assume that a preliminary sample has at least 30 members. n=enter your response here (Round up to the nearest whole number.)arrow_forwardIf a sample emits 2000 counts per second when the detector is 1 meter from the sample, how many counts per second would be observed when the detector is 3 meters from the sample? --Using the sample in above, how many counts per second would be observed when the detector is 10 meters away from the sample?arrow_forwardWhat is the dose rate for the muscle from g-ray source having flux of 100 photons per cm2/s ? (E g=2 MeV, m =0.025 cm-1)arrow_forward
- If x is functionally related to A and B as x = A + B, and if A and B are random variables, then the variance of x is equal to the sum of the variance of A plus the variance of B. True or Falsearrow_forward1. Lead shield that is 0.27 mm thick is equivalent to 1 HVL. How thick should the lead shield be if the radiation intensity is to be reduced to 12.5 % of its original values? 2. A worker at a reactor is composed to 20 mead of slow neutron whose RBE is 4. What is dose equivalent of this exposure? What precentage of his allowed annual dose equivalent did he received?arrow_forwardA sample with a mean of M=50 and a standard deviation of s=12 is being transformed into z-scores. After the transformation, what is the standard deviation for the sample of z-scores?arrow_forward
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