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Re: Related Ci to Bq note
Redid the conversion myself -- came up with the same factor of 100 -- the
equation I gave gives rad/hour. Hence, you are right, Bruce as is Herwig --
my error is so large it isn't even close enough for goernment work!!!
Perhaps this illustrates why a computer program to do conversion from the
old to SI units as suggested by the sergeant is not a bad idea. (Sorry
Melissa, I couldn't let that one go by!)
Ron Kathren
-----Original Message-----
From: Heinmiller, Bruce <heinmillerb@aecl.ca>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Thursday, September 02, 1999 12:10 PM
Subject: FW: Related Ci to Bq note
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>I assume that technical discussions are still on topic, Melissa, and
perhaps
>important, as there appears to be an error in the reference quoted by Ron,
>and pointed out by Herwig. I think my numbers in the past email are
>correct, because by another method, taking the product of a fluence rate of
>1E6/(4pi) / (s.m^2), energy of 1 MeV, yield of 1, and muen/rho of 0.03
>cm^2/g, I arrive at 1.4E-7 Gy/h at 1 m. So I submit that there's a
>two-orders-of-magnitude error in the 1.6E-5 figure if the units are to be
>Gy/h.
>
>Bruce Heinmiller CHP
>heinmillerb@aecl.ca
>
> ----------
> From: Heinmiller, Bruce[SMTP:heinmillerb@aecl.ca]
> Reply To: radsafe@romulus.ehs.uiuc.edu
> Sent: Thursday, September 02, 1999 8:58 AM
> To: Multiple recipients of list
> Subject: RE: Related Ci to Bq note
>
>
> I'll vote rads/h, because if I substitute A=37 000, E=1.25, n=2, and
> d=1, I get 1.5, which looks a bit high but close enough to the 1.32 R/h
> at
> 1 m from a Ci of Co-60, which would be 1.16 rads/h to air.
>
> Bruce Heinmiller CHP
> heinmillerb@aecl.ca
>
> > ----------
> > From: Ron L. Kathren[SMTP:rkathren@tricity.wsu.edu]
> > Reply To: radsafe@romulus.ehs.uiuc.edu
> > Sent: Thursday, September 02, 1999 1:02 AM
> > To: Multiple recipients of list
> > Subject: Re: Related Ci to Bq note
> >
> > 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
> >
> >
> > >
> > >------ =_NextPart_000_01BEF39B.38E5B050
> > >Content-Type: text/plain; charset="us-ascii"
> > >Content-Transfer-Encoding: 7bit
> > >
> > >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.
> > >
> >
>
>
>
>------_=_NextPart_001_01BEF576.7E4F4AD0
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>charset=3Dus-ascii">
><META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
>5.5.2448.0">
><TITLE>FW: Related Ci to Bq note</TITLE>
></HEAD>
><BODY>
>
><P><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">I assume that =
>technical discussions are still on topic, Melissa, and perhaps =
>important, as there appears to be an error in the reference quoted by =
>Ron, and pointed out by Herwig. I think my numbers in the past =
>email are correct, because by another method, taking the product of a =
>fluence rate of 1E6/(4pi) / (s.m^2), energy of 1 MeV, yield of 1, and =
>muen/rho of 0.03 cm^2/g, I arrive at 1.4E-7 Gy/h at 1 m. So I =
>submit that there's a two-orders-of-magnitude error in the 1.6E-5 =
>figure if the units are to be Gy/h.</FONT></P>
>
><P><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Bruce Heinmiller =
>CHP</FONT>
><BR><FONT COLOR=3D"#0000FF" SIZE=3D2 =
>FACE=3D"Arial">heinmillerb@aecl.ca</FONT>
></P>
>
><P><FONT SIZE=3D1 FACE=3D"MS Sans Serif">----------</FONT>
><BR><B><FONT SIZE=3D1 FACE=3D"MS Sans Serif">From:</FONT></B> =
><FONT SIZE=3D1 FACE=3D"MS Sans Serif">Heinmiller, =
>Bruce[SMTP:heinmillerb@aecl.ca]</FONT>
><BR><B><FONT SIZE=3D1 FACE=3D"MS Sans Serif">Reply To:</FONT></B> =
> <FONT SIZE=3D1 FACE=3D"MS Sans =
>Serif">radsafe@romulus.ehs.uiuc.edu</FONT>
><BR><B><FONT SIZE=3D1 FACE=3D"MS Sans Serif">Sent:</FONT></B> =
><FONT SIZE=3D1 FACE=3D"MS Sans Serif">Thursday, September 02, 1999 8:58 =
>AM</FONT>
><BR><B><FONT SIZE=3D1 FACE=3D"MS Sans Serif">To:</FONT></B> =
> <FONT SIZE=3D1 FACE=3D"MS Sans Serif">Multiple =
>recipients of list</FONT>
><BR><B><FONT SIZE=3D1 FACE=3D"MS Sans Serif">Subject:</FONT></B> =
> <FONT SIZE=3D1 FACE=3D"MS Sans =
>Serif">RE: Related Ci to Bq note</FONT>
></P>
><BR>
>
><P><FONT SIZE=3D2 FACE=3D"Arial">I'll vote rads/h, because if I =
>substitute A=3D37 000, E=3D1.25, n=3D2, =
>and</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">d=3D1, I get 1.5, which looks a =
>bit high but close enough to the 1.32 R/h at</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">1 m from a Ci of Co-60, which would =
>be 1.16 rads/h to air.</FONT>
></P>
>
><P><FONT SIZE=3D2 FACE=3D"Arial">Bruce Heinmiller CHP</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">heinmillerb@aecl.ca</FONT>
></P>
>
><P><FONT SIZE=3D2 FACE=3D"Arial">> ----------</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> From: =
> Ron L. =
>Kathren[SMTP:rkathren@tricity.wsu.edu]</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> Reply To: =
>radsafe@romulus.ehs.uiuc.edu</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> Sent: =
> Thursday, September 02, 1999 =
>1:02 AM</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> To: Multiple recipients =
>of list</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> Subject: =
> Re: Related Ci to Bq note</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> </FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> Yes, I think so. Can you =
>show me where you seem to be having a problem?</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> -----Original =
>Message-----</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> From: Herwig Mandl =
><H.Mandl@lkasbg.gv.at></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> To: Multiple recipients of list =
><radsafe@romulus.ehs.uiuc.edu></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> Date: Tuesday, August 31, 1999 =
>1:32 AM</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> Subject: AW: Related Ci to Bq =
>note</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> </FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> </FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >------ =
>=3D_NextPart_000_01BEF39B.38E5B050</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Content-Type: text/plain; =
>charset=3D"us-ascii"</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Content-Transfer-Encoding: =
>7bit</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Are you sure, that the =
>formula below will give "Gray/hour" and not</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> "Rad/hour"</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Herwig from Salzburg</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >----------</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Von: Ron L. Kathren</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Gesendet: Montag, 30. August =
>1999 20:50</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >An: Multiple recipients of =
>list</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Betreff: Re: Related Ci to =
>Bq note</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >The SI equivalent of the 6CE =
>rule was fully discussed on p. 47 of</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> "Radiation</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Protection", Medical =
>Physics Handbook 16 published in 1985 (!) by Adam</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Hilger Ltd. in conjunction =
>with the Hospital Physicists Association and</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> is:</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> =
>> &n=
>bsp; Gray/hour =3D 1.6E-5AEn/d^2</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >where A is the activity in =
>megabequerel, E the photon energy is MeV, n</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> the</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >number of phtons per =
>disintegration, and d the distance in meters from</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> the</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >point source.</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >Also given in that book is =
>an equation to convert beta fluence rate to</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> dose</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> >and a discussion gamma, the =
>exposure rate constant in terms of SI units.</FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> ></FONT>
><BR><FONT SIZE=3D2 FACE=3D"Arial">> </FONT>
></P>
><BR>
>
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