Re: Specific gamma-ray dose constant for 137Cs

[daleboyce@charter.net]

Hi all,



In addition to the 82 revision John quotes, the ANSI/ANS.6.1.1-1077 standard

used in Unger and Trubey 1981 was intended for shielding design only.  It

estimates peak dose at depth.  ANSI/ANS.6.1.1 1991 estimates Effective Dose

Equivalent, and gives much different results.  It restates that 1977 was

intended for shielding calculations, and that 1991 was intended to measure

biological effectiveness.  It doesn't state it, but the 1977 standard is

listed as "withdrawn".



Dale

daleboyce@charter.net





----- Original Message ----- 

From: "John Jacobus" <crispy_bird@YAHOO.COM>

To: "Michael McNaughton" <mcnaught@LANL.GOV>; <radsafe@list.vanderbilt.edu>

Cc: "Andrew Green" <andrew.green@LANL.GOV>

Sent: Wednesday, November 10, 2004 4:33 PM

Subject: Re: Specific gamma-ray dose constant for 137Cs





> There was a revision to the Unger and Trubey reference

> (1981) that appeared in May 1982 due to an error in

> the flux-to-dose equivalent factor.  The results were

> too high.  They also mention a typographical error in

> the Cs-137 values.  The gamma ray constant is listed

> as 1.017 E-4.  This is equivalent to the value for

> Ba-137m, which is 1.081 E-4.

>

> --- Michael McNaughton <mcnaught@LANL.GOV> wrote:

>

> > I cannot reproduce the specific gamma ray dose

> > constant for Cs-137 in the

> > Rad Health Handbook (Table 6.2.2 of the 3rd edition

> > or Table 6.1.2 of the

> > 1992 edition). I think it is about 10% too high.

> > Could it be that Unger and

> > Trubey forgot about the internal conversion of

> > Ba-137m (which happens in

> > 10% of the decays)? I would appreciate any insights.

> >

> > mike

> > Mike McNaughton

> > Los Alamos National Lab.

> > email: mcnaught@LANL.gov or mcnaughton@LANL.gov

> > phone: 505-667-6130; page: 505-664-7733

> >

> >

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>

> =====

> +++++++++++++++++++

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>

> -- John

> John Jacobus, MS

> Certified Health Physicist

> e-mail:  crispy_bird@yahoo.com

>

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