Re: Maze doors for HDR?

[John Jacobus <crispy_bird@YAHOO.COM>]

Try using the calculations found in NCRP Report 49,

which has scattering ratios for Ir-192.  I bet you

will find your current shielding for the Clinac 18 is

sufficicnt for Ir-192.



--- "Dr. Sergio Faermann" <sergio@BGUMAIL.BGU.AC.IL>

wrote:

> 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

> 





=====

+++++++++++++++++++

"We cannot escape danger, or the fear of danger, by crawling into bed and pulling the covers over our heads."

-- Franklin Delano Roosevelt



-- John

John Jacobus, MS

Certified Health Physicist

e-mail:  crispy_bird@yahoo.com





	

		

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