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Re: Dose Constant

As taken from Table 6.1 (and contorted into ASCII ;-) ) of _The Health 
Physics and Radiological Health Handbook_, Shleien, 1992...

The specific gamma ray dose constant was summed over n according to:
  SGRDC = (1 / 4 PI R^2) SUM Si D(Ei)
     SGRDC = specific gamma ray dose constant
     R     = 100 cm
     n     = number of gamma rays emitted by the nuclide
     Si    = emission probability of each gamma ray
     Ei    = energy of the gamma ray (Mev)
     D(Ei) = dose rate per unit flux density from Eq. 1

Only gamma rays of energy greater than 0.01 Mev were included. 

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On Wed, 1 Nov 1995, Carl Peterson wrote:

> Radsafers:
> 
> The specific gamma ray dose constant for Cd-109 has been said to be
> 4.983e-05 mSv/hr per MBq at one meter.
> 
> My question is: Is this over 4 pi, or in 1cc of tissue?
> 
> Thanks
> 
> Carl
> 
> 
> 
> 
> =======================================================================
>   Carl A. Peterson                          Schlumberger-Doll Research
>   e-mail:Peterson@ridgefield.sdr.slb.com    Old Quarry Road
>   Phone: (203)431-5272                      Ridgefield, CT  06877-4108
>   Fax:   (203)438-3819
> =======================================================================
> 
> 
> 
>