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 5, Problem 5.36P
To determine
Half-thickness of boral for thermal neutrons at room temperature.
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If air is 80% N15 and 20% O16. Using the data below, calculate the average distance
a thermal neutron travels in air before having an interaction.
Air density = 1.202 gm/cm3
%3D
o16 atomic wt 15.994 gm
N15 atomic wt = 14.0067 gm
%3!
N15 total microscopic cross
016 total microscopic cross section = 4.03 b
12.20 b
%3D
section
%3D
129.328 cm
1.855 cm
123.762 cm
12.653 cm
In a neutron-activation experiment, a flux of
108 neutrons/cm2sec is incident normally on
a foil of area 1 cm?, density 1022 atoms/cm3
, and thickness 10-2 cm. The target nuclei
have a total cross section for neutron
capture of 1 barn (10-24 cm2), Find the
number of b ( the light particle) per second ?
104 particle/sec
102 particle/sec
106 particle/sec
108 particle/sec
Clear my choice
An a grain with a kinetic energy of 5 MeV
approaches an Au (gold) nucleus with the
sighting parameter equal to the radius of the
Au nucleus.
a. Find the maximum approach distance of the a
particle to the nucleus in these conditions.
(Za=2, ZAu=79 and rAu=7 fm)
b. How close can the alpha particle get to the
gold core?
c. Únder what conditions can this approach take
place (Assume the target core does not
rebound)
Chapter 5 Solutions
Introduction To Health Physics
Ch. 5 - Prob. 5.1PCh. 5 - Prob. 5.2PCh. 5 - Prob. 5.3PCh. 5 - Prob. 5.4PCh. 5 - Prob. 5.5PCh. 5 - Prob. 5.6PCh. 5 - Prob. 5.7PCh. 5 - Prob. 5.8PCh. 5 - Prob. 5.9PCh. 5 - Prob. 5.10P
Ch. 5 - Prob. 5.11PCh. 5 - Prob. 5.12PCh. 5 - Prob. 5.13PCh. 5 - Prob. 5.14PCh. 5 - Prob. 5.15PCh. 5 - Prob. 5.16PCh. 5 - Prob. 5.17PCh. 5 - Prob. 5.18PCh. 5 - Prob. 5.19PCh. 5 - Prob. 5.20PCh. 5 - Calculate the probability that a 2-MeV photon in a...Ch. 5 - Prob. 5.22PCh. 5 - Prob. 5.23PCh. 5 - Prob. 5.24PCh. 5 - Prob. 5.25PCh. 5 - Prob. 5.26PCh. 5 - Prob. 5.27PCh. 5 - Prob. 5.28PCh. 5 - Prob. 5.29PCh. 5 - Prob. 5.30PCh. 5 - Prob. 5.31PCh. 5 - Prob. 5.32PCh. 5 - Prob. 5.33PCh. 5 - Prob. 5.34PCh. 5 - Prob. 5.35PCh. 5 - Prob. 5.36PCh. 5 - Prob. 5.37PCh. 5 - Prob. 5.38PCh. 5 - Prob. 5.39PCh. 5 - Prob. 5.40PCh. 5 - A 1-M solution of boric acid, H3BO3 , is...Ch. 5 - Prob. 5.42PCh. 5 - Prob. 5.43PCh. 5 - Prob. 5.44PCh. 5 - Prob. 5.45PCh. 5 - Prob. 5.46PCh. 5 - Prob. 5.47PCh. 5 - Prob. 5.49PCh. 5 - Prob. 5.50PCh. 5 - Prob. 5.54PCh. 5 - What is the range in tissue of the beta particles...Ch. 5 - Prob. 5.56P
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- (a) Show that if you assume the average nucleus is spherical with a radius r=r0A1/3, and with a mass at A u, then its density is independent at A. (b) Calculate that density in u/fm3 and kg/m3, and compare your results with those found in Example 31.1 for 56Fe.arrow_forwardThe atomic weight of cadmium is 112.41, and its density is 8.65 g/cm3. Using Figure 14.3, estimate the attenuation distance of a thermal neutron beam in cadmium. (The attenuation distance is the distance traveled after which the intensity of the beam is reduced to 1/e of its initial value, where e is the base of the natural logarithms.)arrow_forward(a) Calculate the radius of 58Ni, one of the most tightly bound stable nuclei. (b) What is the ratio of the radius of 58Ni to that at 258Ha, one of the largest nuclei ever made? Note that the radius of the largest nucleus is still much smaller than ?le size of an atom.arrow_forward
- No stable nuclides exist that have Z greater than ___. (10.3)arrow_forwardData from the appendices and the periodic table may be needed for these problems. Show that the activity of the 14C in 1.00 g of 12C found in living tissue is 0.250 Bq.arrow_forwardThe nucleus 33S has I=3/2 and γN = 2.054 x 107 T-1 s-1. Calculate the energies of the nuclear spin states in a magnetic field of 6.000 T.arrow_forward
- The isotope of Nickel, 66Ni decays by β emission, has a half-life of 2.3 days. and the β particles have an average energy of 65 keV. A source consisting of this isotope has an initial number of atoms N0 = 5 x 1020 atoms. What is the power per unit area initially deposited by this source in a small target placed at 1m distance from the source? Select one: a. 1.45 W/m2 b. 7.6 MW/m2 c. 4.5 kW/m2 d. 35 W/m2arrow_forwardIf air is 80% N15 and 20% 016. Using the data below, calculate the average distance a thermal neutron travels in air before having an interaction. Air density = 1.202 gm/cm3 016 atomic wt = 15.994 gm N15 atomic wt = 14.0067 gm O10 total microscopic cross section = 4.03 b section N15 total microscopic cross 12.20 b %3D 129.328 cm O 1.855 cm O 123.762 cm 12.653 cmarrow_forwardStarting from the Clasius-Clapeyron equation, Lo + constant kBT log p and assuming the latent heat of evaporation per gram of water to be constant, and equal to L= 2260 J/g , find the boiling temperature of water in degrees Celcius at a pressure of 50.0 atm. Each oxygen atom has 8 protons and 8 neutrons in its nucleus. The boiling temperature of water at a pressure of 50.0 atm is around 250 °C. How do you account for the difference? R = 8.31 //(mol · K) , m,-1.67x1027 kg , NA=6.02x1023 mol-1arrow_forward
- B) Calculate the average nuclear binding energy of 13Al nucleus, knowing that the mass defect of aluminum = 0.24136 a.m.u. , then state whether the nucleus of 7Al is stable or not. (1 a.m.u. = 1.6605 x 10-27 kg, 1 m.e.v. = 1.602177 x 10-13 Jules).arrow_forwardCalculate the mass-defects of oxygen-16 (oxygen has an atomic number of 8 and atomic weight of 15.9949 u) =0.13700?arrow_forwardWhat fraction of 5-MeV alpha particles will be scattered through an angle greater than 8° from a gold foil (Z=79, density = 19.3 g/cm^3) of thickness of 10^-8m?arrow_forward
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