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 10, Problem 10.23P
(a)
To determine
TVL value of lead.
(b)
To determine
The HVL value of lead.
(c)
To determine
The relationship between TVL and HVL.
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A radioactive source is producing 1.50 MeV gamma rays. If two detectors are placed 4.00 m and 7.00 m away respectively, what is the ratio of the measured intensities of the near detector over the far detector (I2/I1)? Do NOT include units in your answer answer to 2 decimal places.
7
A 228Th source is labeled 1.50 mCi, but its present activity is found to be 3.47 ✕ 106 Bq.
(a)What is the present activity in mCi? mCi
(b)How long ago (in y) did it actually have a 1.50 mCi activity?
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