Introduction To Health Physics
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  90Y when in equilibrium with 10 mg of 90Sr .

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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 Need Help? Read It
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?
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