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 13.10P
To determine
95% confidence limits.
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Question 5: An antibody suspension is applied through a tube at a flow rate of 9 lit/min. The
mass diffusivity of the antibody in the suspension is 75 um?/s. The tube has an internal
diameter of 1.5 cm and a length of 20 cm.
5a. Calculate Sherwood number
5b. Calculate Schmidt number
5c. Calculate the rate of antibody deposition across the internal surface of the tube
Antibody solution
Density = 1050 kg/m³
Viscosity = 2 mPa.s
Concentration = 5 mM
Internal diameter = 1.5 cm
Length = 20 cm
27. A shielded vial with a 1-mm thick lead shield contains Tc. If
A. 11.8 mR/hr
В. 23.5 mR/hr
C. 47 mR/hr
D. 94 mR/hr
the unshielded sample yielded an exposure rate of 188 mR/hr,
what will the exposure rate be from the shielded vial? (The lead
HVL for Tc is 0.25 mm.)
28. If "Co gives an exposure rate of 38 R/hr at 2 m, at least how
А. 2
В. 3
many HVLS of concrete shielding are required to reduce this
exposure to below 2 R/hr at the same distance? (The concrete
HVL for "Co is 6.2 cm.)
С. 4
D. 5
A GM counter has dead time of 250 s. It records 20.000 counts per
minute.
What is the actual count rate?
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