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Re: Related Ci to Bq note

The SI equivalent of the 6CE rule was fully discussed on p. 47 of "Radiation
Protection", Medical Physics Handbook 16 published in 1985 (!) by Adam
Hilger Ltd. in conjunction with the Hospital Physicists Association and is:

                Gray/hour = 1.6E-5AEn/d^2

where A is the activity in megabequerel, E the photon energy is MeV, n the
number of phtons per disintegration, and d  the distance in meters from the
point source.

Also given in that book is an equation to convert  beta fluence rate to dose
and a discussion gamma, the exposure rate constant in terms of SI units.

Ron Kathren
-----Original Message-----
From: Mike Lantz <mlantz33@cybertrails.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Monday, August 30, 1999 11:22 AM
Subject: Related Ci to Bq note


>Charly Frey wrote:
>
> Does somebody know a converter Curie to bequerel
>
>
>This question reminded me of a note I wrote for RSO magazine a few years
>ago that is somewhat related.  There is the 6CEn thumb rule for photon
>dose rates(C=Curies, E=photon energy, n=yield). Although our facility
>almost never has to use Becquerel units, we occasionally received
>sources recorded in GBq.  I came up with a quick conversion factor for
>photon dose rates that was fairly simple and still accurate:
>GEn/6
>
>It's general basis is what was discussed previously.  The Curie to
>Becquerel conversion is 3.7E10.  One Curie is 37 GBq (~6x6).  Long story
>short, divide by 6 instead of multiplying by 6 and you have a new dose
>rate conversion factor.
>
>Mike Lantz
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