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The doses are normalized to dmax without the eye shield (Diagram 1) using a 10 x 10 cone. When 1.00 Gy is delivered to dmax using 6 MeV with the shield, you get 1.08 Gy to the undersurface of the eyelid (Point 1) and 3.4% transmission to the lens (Point 2) (See table).

936-583-A-Diagram-1

TRANSMISSION
USING XV-2 FILM*

DOSE IN Gy
When 1.00 Gy is
Delivered to dmax

AT 3mm DEPTH***
USING TLD’S**

 

6 MeV

9 MeV

6 MeV

9 MeV

 

 

0.72

0.77

 Surface, No shield

 

 

 

0.79

0.81

 No Shield, Dose at Interface

 

3.4%

5.6%

1.08

1.11

 2 mm Tungsten

Point 1

3.0%

4.8%

1.03

1.06

 2 mm Tungsten + 0.5 mm Aluminum

Point 1

3.0%

4.4%

0.95

1.02

 2 mm Tungsten + 1 mm Aluminum

Point 1

2.5%

3.3%

1.12

1.13

 3 mm Tungsten

Point 1

2.4%

2.9%

1.02

1.05

 3 mm Tungsten + 0.5 mm Aluminum

Point 1

2.5%

2.8%

0.97

1.06

 3 mm Tungsten + 1 mm Aluminum

Point 1

Unreferenced data on this product is preliminary findings of Radiation Products Design, Inc. and is not to be used as a technical reference.
*XV-2 Film placed under/below tungsten eye shield at 3 mm depth (anterior surface of lens)
**TLD Microcubes placed under simulated eye lid using tungsten eye shields
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