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Maze doors for HDR?

Dear colleagues

 

We are in process of receiving a new HDR unit ( Gammamed),which is to be

installed in an existing accelerator room

 ( Clinac 18)-10 MV X-rays).

The room was designed at the time with a maze and without the need of a

shielded door.

My question is what is the methodology to calculate the dose at the

door( scattered radiation) for  a 10 Ci Ir-192 HDR source? I didn't find

in NCRP 51 references to the reflection coefficient for Ir-192.

 

Thanking you in advance

 

Sergio Faermann