Re[2]: dose conversion

[D_S_Steve_Gunnink@RL.gov]

     At 11:26 PM on 4/24/97 You wrote:
>If you can take a reading of the source you can use the 6CEN formula to 
>estimate the Curie amount.  C = D/E

My understanding is that the 6CEN formula only applies to Gamma and X-Rays.
Since this is a Sr-90 source, I would expect only Beta.  You should consider the
following:  Decay correct the 78 beta Rads per second from 12/17/65 to the 
present.  Convert Rads per second into Rads per hour.  Then use this thumbrule  
-  Dose Rate at 1 cm = 300 Rad/hr per mCi.  That should help you "back calculate
the activity (as I understood Charles to ask). 

I hope this provides a little more help.

Steve Gunnink
d_s_gunnink@rl.gov
Health Physics Technical Training
______________________________ Reply Separator _________________________________
Subject: Re: dose conversion 
Author:  "Alan R. Marchand" <radarm@accessnv.com> at -MailLink
Date:    4/24/97 11:26 PM


At 03:31 PM 4/24/97 -0500, you wrote:
>I need to make a shipment of Sr-90, the only indicator of activity 
>that I have is an old calibration stating that the eye applicator 
>delivered 78 beta rads per second as of 12/17/65. 
>
>Anyone know how the dose rate was calculated and I can back calculate 
>into a reasonable estimate of the activity? 
><><><><><><><><><><><><><><><><><>            
><>    Charles R. (Russ) Meyer                  <> 
><> Email: cmeyer@brc1.tdh.state.tx.us           <> 
><>     Phone:(512)834-6688                       <>
><>        Fax:(512)834-6654                        <> 
><><><><><><><><><><><><><><><><><>
>
>
Is the eye applicator an instrument? You should be able to ship it 
"Excepted package-instruments or articles" 10-2 A2 value or "Excepted 
package- limited quantity of material" 10 -3 A2 value and the package is 
below .5 mr/hr contact on all six sides. Then fill out the exception 
statement place it in or on the package. Mark the item or the package 
radioactive and ship.  
     

     
Alan
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Subject: Re: dose conversion 
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