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 9, Problem 9.9P
To determine
How long should the sample be counted.
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In a person infected with measles, the virus level N (measured in number of infected cells per ml of blood plasma) reaches a peak
density at about t 12 days (when a rash appears) and then decreases fairly rapidly as a result of immune response. The area
under the graph of N(t), the t-axis, and the lines t = 0 to t = 12, (as shown in the figure) is equal to the total amount of infection
needed to develop symptoms (measured in density of infected cells x time).
N= f)
1000-
12
21
The function has been modeled by the function
(t) = -t(t - 21)(t + 1).
Use this model with six subintervals and their midpoints to estimate the total amount of infection (in (infected cells/mL) - day)
needed to develop symptoms of measles.t
(infected cells/mL) day
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A local police department attempted to estimate the average rate of speed of vehicles along a strip of Main
Street. With hidden radar, the speed of a random selection of 35 vehicles was measured, which yielded a
2
sample mean of 45 mph and a standard deviation of 5 mph. Find the 99% confidence interval for the
population mean. Write a concluding statement.
the mass m, is given the equation m=i[0.69]t. i is the intitial dose and t is the number of hours since the dose. Suppose the patient is given inital dose of 200mg. When will the amount of ibuprofen in the bloodstream be reduced by a factor of one half. round your answer to the nearest tenth of an hour
Chapter 9 Solutions
Introduction To Health Physics
Ch. 9 - Prob. 9.1PCh. 9 - Prob. 9.2PCh. 9 - Prob. 9.3PCh. 9 - Prob. 9.4PCh. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - Prob. 9.10P
Ch. 9 - Prob. 9.11PCh. 9 - Prob. 9.12PCh. 9 - Prob. 9.13PCh. 9 - A counting system has a background of 360 counts...Ch. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Prob. 9.19PCh. 9 - Prob. 9.20PCh. 9 - Prob. 9.21PCh. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - Prob. 9.24PCh. 9 - Prob. 9.25PCh. 9 - Prob. 9.26PCh. 9 - Prob. 9.27PCh. 9 - Prob. 9.28PCh. 9 - Prob. 9.29PCh. 9 - Prob. 9.31PCh. 9 - Prob. 9.33PCh. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Prob. 9.38PCh. 9 - Prob. 9.39PCh. 9 - Prob. 9.44P
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