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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Primary <strong>Radiation</strong>:<br />
<strong>NCRP</strong>-<strong>147</strong> Model<br />
Grid, cassette, maybe<br />
supporting structures<br />
No patient!<br />
t!<br />
x pre<br />
} x tot = x + x pre<br />
x<br />
Assume primary beam attenuation in image receptor is due to a<br />
pseudo-barrier whose equivalent thickness x pre gives same<br />
transmission as that seen for actual image receptors.<br />
16
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