Biomedical Engineering Reference
In-Depth Information
(
b
) What is the probability that the pathlength will be between
these two distances?
30.
In Problem 21, the range
R
represents the mean value of the
pathlength in each medium. In view of Fig. 6.8, make a rough,
but more realistic, estimate of the lead thickness needed.
6.10
answers
1.
-0.122
(
b
)21W
1.97 MeV cm
-1
4.
18.
(
a
) 3.3 cm
0.0383 MeV cm
-1
7.
(
b
) 270 cm
9.
(
a
) 120
(
c
) 250 m
(
b
)41
19.
2.2 MeV
(
c
) 0.61
21.
0.42 cm
12.
(
a
) 0.072
24.
(
a
) 2.19
10
8
MeV s
-1
×
(
b
) 0.13
(
b
) 4.3
10
-11
s
×
(
c
) 0.32
25.
(
a
) 6.6
10
-14
s
×
13.
(
a
) 840 MeV cm
-2
s
-1
27.
(
a
)
∼227,000
(
b
) 870 cm
-2
s
-1
∼10
5
(
b
)
14.
(
a
) 0.0088
28.
0.27
