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 7, Problem 7.12P
To determine
The RR and ERR for the group of 202 leukemia cases in 76000 subjects.
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Check out a sample textbook solutionStudents have asked these similar questions
The cell-survival data in the table below fit a multitarget, single-hit survival curve.
A)Find the slope at high doses.
B) Find the extrapolation number.
C) Write the equation that describes the data.
Dose (Gy)
Surviving Fraction
0.10
0.993
0.25
0.933
0.50
0.729
1.00
0.329
2.00
0.0458
3.00
0.00578
4.00
0.00072
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BIEE
Using the systematics of exponential processes, the time scale for getting out of a pandemic at its peak through exponential decay of the infection rate or the death rate is estimated from:
If the delta variant death rate per day (Po) peaked at 2000 in late September and declined at the national rate of − 1% per day, what is t, the time in days to defeat the virus (i.e. time until the last person dies)?
answer choices:
350
525
450
760
A GM counter records 16000 counts per minute,while the true counting rate is 17400 counts per minute, what is the dead time of the GM counter?
Chapter 7 Solutions
Introduction To Health Physics
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- 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?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_forwardIf 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_forward
- the V•O2max of people tends to declineafter age 30 by about 9% per decade for sedentary individuals,but it declines less than 5% per decade for people who stay active.The average V•O2max in healthy 30-year-olds is about 3.1 L/min.Using the information given here, what would the average V•O2maxbe in 60-year-olds who have been sedentary throughout theirlives and in 60-year-olds who have stayed active (keep in mindthat the decline is exponential)?arrow_forwardA 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_forwardA GM counter has dead time of 250s,it records 20,000 counts per minute,what is the actual count ratearrow_forward
- Estimate how long a COVID-19 infected droplet will remain in the air when exhaled. Treat the droplet as a sphere of water with a 5 µm radius. Use the size and density of water to determine the mass of the sphere. Using a reasonable height, approximate the time the droplet will remain in the air.arrow_forwardA radiographic technique calls for 46 kVp and 28 mAs which results in an exposure of 278 µGy. What is the expected exposure if the technique is changed to 75 kVp and 14 mAs? Round your answer to the nearest whole number. Do not include units.arrow_forwardA person's hand receives a radiation dose at a rate of 50mSvh-1 at a distance of 1cm from a source. What would the dose rate be if the person's hand is 18cm from source?arrow_forward
- What is the dose in mSv for 1.5 mGy of α exposure?arrow_forwardAfter the first covid-19 case found in Olde town, a group of volunteers started counting the number of case and kept the record of number of infected people in daily basis. After collecting data for 18 days they made a graph as shown in the figure. It was perfect exponential trendline fit. The fit equation is shown in the plot. The equation has 0.2 multiplying the days. What is the meaning of this number? Infected population vs days in olde town 40 35 30 Infected population = e0.2 days R2 = 1 25 20 15 10 10 15 days Everyday there are 20 new people being infected Everyday the number of infected individuals is increasing 20 percent of running total of each day Everyday there are 0.2 new people being infected Everyday there are 2 new people being infected Everyday the number of infected individuals is increasing 20 percent to the first day the infection was found Infected population 20arrow_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
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