LESSON 4
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1.
C
6 to 18
A rough estimation...period. (Part A - page 4-2, para 4-2)
2.
A
Estimate
When decay rates...designated. (Part A - page 4-2, para 4-3)
3.
D
When the decay rate is known.
The decay rate. (Part A - page 4-3, para 4-4c)
4.
B
6
Generally, each of these...reports. (Part B - page 4-3, para 4-5a)
5.
C
0414.
EXAMPLE: A radiation reading... (Part B - page 4-4, para 4-5b(1))
Ta 0900 Ra 150
Tb 1800 Rb 42
n = 1.2 (assumed)
1800 0900
T1
1
150 1.2
1
42
9
9
T1
4.76 (.76 x60 45.6 round to 46minutes)
3.57 1
.8333
1.888
9
9
T1
4.76 (.76 x60 45.6 round to 46minutes)
(3.57 yx.8333 ) 1 1.888
H-hour = Ta T1
9 4.46 = 4.24 (.24x60=14.4 round to 14 minutes)
H-hour = 0414 hours
6.
C
1.2
EXAMPLE: Suppose a set of...(Part C - page 4-7 through 4-11, para 4-7a through 4-
7b(2))
CM2306
4-16
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