Re: Related Ci to Bq note

[Mike Lantz <mlantz33@cybertrails.com>]

My point wasn't that I had invented anything new about radiation.  I had
simply reformatted it into thumb rule that might be easier to remember:
GEn/6 at one foot. I liked it, actually. 

That's what the familar 6CEn at one foot did for many people and I was
attempting to provide another simple rule.  Certainly, this is easier
than 1.6E-5AEn/d^2.  What you have listed is the same and, in fact, I
noted that in my article in 1996.

Respectfully,
Mike Lantz
mlantz33@cybertrails.com

"Ron L. Kathren" wrote:
> 
> 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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