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 13.7P
To determine
The activity after day 1 and after day10 after ingestion
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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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Soon after taking an aspirin, a patient has absorbed 300 milligrams of the drug. If the amount of aspirin in the bloodstream decays exponentially, with half being removed every 2 hours, find, to the
nearest 0.1 hour, the time it will take for the amount of aspirin in the bloodstream to decrease to 100 milligrams.
hr
A population of E. coli bacteria grows exponentially with time. You believe that the mean time between divisions is t, = 26 min, and that cell death occurs on average after tm = 200 hr. The
population starts with 1000 cells. Complete parts (a) through (c).
(a) Use the equation N(t) = N, e0-m)t to predict how many cells are present after 3 hours.
The number of cells present after 3 hours is.
(Do not round until the final answer. Then round to the nearest integer as needed.)
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