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 4, Problem 4.24P
To determine
The mass of
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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
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Nuclear matter is extremely dense.
(a) Calculate the density, in kg/m³, of A neutrons in a sphere of radius r = ro 4¹/3, where ro = 1.2 x 10-¹5 m.
(b) Find the diameter of a sphere of nuclear matter that would have the same mass as the earth. The average radius
of the earth is 6.4 x 106 m and the average density of the earth is 5.5 x 10³ kg/m³.
The nucleus of an atom can be modeled as several protons and neutrons
closely packed together. Each particle has a mass of 1.67 x 10-27 kg and
radius on the order of 10-15 m.
(a) Use this model and the data provided to estimate the density of the
nucleus of an atom.
| kg/m³
(b) Compare your result with the density of a material such as iron
w = 7874 kg/m?). What do your result and comparison suggest about the
structure of matter?
Chapter 4 Solutions
Introduction To Health Physics
Ch. 4 - Prob. 4.1PCh. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Prob. 4.4PCh. 4 - If we start with 5 mg of 210Pb , what would be the...Ch. 4 - Prob. 4.6PCh. 4 - Prob. 4.7PCh. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - For use in carcinogenesis studies, benzo(a)pyrene...
Ch. 4 - Prob. 4.11PCh. 4 - Calculate the number of beta particles emitted per...Ch. 4 - Prob. 4.13PCh. 4 - Prob. 4.14PCh. 4 - How much 234U is there in 1 metric ton of the...Ch. 4 - Prob. 4.16PCh. 4 - Prob. 4.17PCh. 4 - Prob. 4.18PCh. 4 - The mean concentration of potassium in crustal...Ch. 4 - Prob. 4.20PCh. 4 - Prob. 4.21PCh. 4 - Prob. 4.22PCh. 4 - Prob. 4.23PCh. 4 - Prob. 4.24PCh. 4 - Prob. 4.25PCh. 4 - Prob. 4.26PCh. 4 - Prob. 4.27PCh. 4 - Prob. 4.28PCh. 4 - Prob. 4.29PCh. 4 - Prob. 4.31PCh. 4 - Prob. 4.32PCh. 4 - Prob. 4.33PCh. 4 - Prob. 4.34PCh. 4 - Prob. 4.35PCh. 4 - Prob. 4.36PCh. 4 - Prob. 4.37PCh. 4 - Prob. 4.38PCh. 4 - Prob. 4.39PCh. 4 - Prob. 4.40PCh. 4 - Prob. 4.41PCh. 4 - Prob. 4.42PCh. 4 - Prob. 4.43PCh. 4 - What is the (a) half-life? (b) mean life (in...Ch. 4 - Prob. 4.45PCh. 4 - Prob. 4.46PCh. 4 - Prob. 4.47PCh. 4 - Prob. 4.48PCh. 4 - Prob. 4.49PCh. 4 - Prob. 4.53PCh. 4 - Prob. 4.54PCh. 4 - Prob. 4.55P
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