Difference between revisions of "Air-kerma, entrance surface"
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| − | The unit for entrance surface air kerma is the Gy. Entrance surface air kerma < | + | The unit for entrance surface air kerma is the Gy. Entrance surface air kerma <math>K_e</math> can be calculated from incident air kerma <math>K_i</math> using suitable backscatter factor <math>B</math>, or determined directly using small dosimeters (thermoluminescent or semiconductor) positioned at the representative point on the skin of the patients. (Adapted from [[ICRP Publication 117]], 2010) |
''[[ICRP Glossary]] entry - May 2019'' | ''[[ICRP Glossary]] entry - May 2019'' | ||
Revision as of 15:41, 11 June 2019
The air kerma on the central x-ray beam axis at the point where the x-ray beam enters the patient. The contribution of backscatter radiation is included through backscatter factor ([math]B[/math]), thus:
[math]K_e= B⋅K_i[/math]
The unit for entrance surface air kerma is the Gy. Entrance surface air kerma [math]K_e[/math] can be calculated from incident air kerma [math]K_i[/math] using suitable backscatter factor [math]B[/math], or determined directly using small dosimeters (thermoluminescent or semiconductor) positioned at the representative point on the skin of the patients. (Adapted from ICRP Publication 117, 2010)
ICRP Glossary entry - May 2019
