Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Question
Chapter 4, Problem 4.47P
(a)
To determine
To Calculate: The Specific activity of Rn-222
(b)
To determine
To Calculate: The weight of 4-pCi Rn-222.
(c)
To determine
To Calculate: The quantity (in moles) of the Rn gas in 1L
(d)
To determine
To Calculate: The number of moles of air in 1L
(e)
To determine
To Calculate: The volumetric percent of 4-pCi Rn-222 in 1L at 250C and 760 mmHg.
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Problem II
There is a piece of 10 mm thick a-iron plate. This plate initially
has hydrogen uniformly distributed inside with an initial
concentration Co. Assume that there is no hydrogen in the air. The
plate is left in the air and the hydrogen concentration varies with
the time as follows:
4Co
C(x, t) =
(-9n²Dt\
12
3nx
sin
еxp
where / is the thickness of the plate. If we would like to remove
95% of the hydrogen from the plate, how long will it take when the
plate is at 25 °C?
The pre-exponential and activation energy for hydrogen in a-iron
are 0.1 mm/s and 13,400 J/mol, respectively.
5. A drop of ink is gently deposited in a large volume of motionless water and initially has a radius of 1 mm. After 2 s the ink
drop has diffused into a spherical ball with radius 3 mm. How long will it take the ball to diffuse from a radius of 1 mm to
a radius of 11 mm (in s)? [All distances are root-mean-square averages.]
(A) 8
(B) 15
(C) 20
(D) 35
(E) 50
3. Two gaseous streams enter a combining tube and leave as a single mixture. These data
apply at the entrance section:
For one gas, A, = 75 in?, v, = 500 fps, v, = 10 ft/lb
For the other gas, A2 = 50 in', mass flow rate = 16.67 Ib/s, p= 0.12 lb/ft
At the exit, v3= 350 fps, v3 = 7ft%/lb
%3D
Find the (a) the speed v2 at section 2 (b) the mass flow rate and area at the exit section
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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