NCRP-147 Shielding Models 147 Shielding Models - Radiation ...
NCRP-147 Shielding Models 147 Shielding Models - Radiation ...
NCRP-147 Shielding Models 147 Shielding Models - Radiation ...
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Kerma Behind a Primary Barrier<br />
• The kerma behind a primary barrier of<br />
transmission B(x, kVp) is<br />
K<br />
K<br />
kVp<br />
U W<br />
kVp<br />
(<br />
) (<br />
)<br />
( x,<br />
kVp)<br />
W<br />
B<br />
( x,<br />
kVp<br />
)<br />
2<br />
d<br />
P =<br />
• For the whole distribution of workloads, total<br />
kerma is<br />
P<br />
K<br />
P<br />
( x)<br />
=<br />
∑<br />
kVp<br />
K<br />
W<br />
( kVp)<br />
U W<br />
2<br />
d P<br />
( kVp)<br />
B(<br />
x,<br />
kVp)<br />
12
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