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Re: Related Ci to Bq note

To: <radsafe@romulus.ehs.uiuc.edu>
Subject: Re: Related Ci to Bq note
From: "Ron L. Kathren" <rkathren@tricity.wsu.edu>
Date: Wed, 1 Sep 1999 21:59:59 -0700
Yes, I think so.  Can you show me where you seem to be having a problem?
-----Original Message-----
From: Herwig Mandl <H.Mandl@lkasbg.gv.at>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Tuesday, August 31, 1999 1:32 AM
Subject: AW: Related Ci to Bq note


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>Are you sure, that the formula below will give "Gray/hour" and not
"Rad/hour"
>Herwig from Salzburg
>
>----------
>Von: Ron L. Kathren
>Gesendet: Montag, 30. August 1999 20:50
>An: Multiple recipients of list
>Betreff: 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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