[ RadSafe ] Maximum PermissIble Concentrations (NCRP 22) Days of "body burden" to the times of "ALI"

Thu Nov 8 08:48:58 CST 2012

Drs,  

While ALIs and DAC's have been the working norm for me,  exploring MPCs has been highly interesting. The underlying assumptions are very similar of course, so the outcomes are very much alike.  
I will say the MPC approach forces one to think more mechanistically,  and is both slower, and more satisfying!

Bradly D. Keck, PhD,CHP

On Nov 7, 2012, at 9:31 PM, parthasarathy k s <ksparth at yahoo.co.uk> wrote:

> Dear Dr Thomas Potter,
> 
> I always wonder whether radiation protection improved from the days of "body burden" to the times of "ALI" I recall using well thumbed copies of NBS books in the formative years of my career.Though the source books for much of the data were not available, reading them and using them occasionally wqs very satisfying.
> 
> Regards
> 
> 
> 
> ________________________________
> From: THOMAS POTTER <pottert at starpower.net>
> To: radsafe at health.phys.iit.edu 
> Sent: Thursday, 8 November 2012, 3:22
> Subject: Re: [ RadSafe ] [RadSafe] Maximum PermissIble Concentrations (NCRP 22)
> 
> I have a version of NCRP Report No. 22, "Maximum Permissible Body Burdens and Maximum Permissible Concentrations of Radionuclides in Air and in Water for Occupational Exposures," published as National Bureau of Standards Handbook 69 in 1959 with Addendum 1 dated 1963. (The NBS document cover is literally wrapped around the NCRP document.)
> 
> The document states that the development of these tables was a joint project undertaken by the ICRP and the NCRP, and that Handbook 69 (NCRP 22) contains only excerpts (primarily the tabular results of this development) from the more comprehensive ICRP report, and excludes much of the text describing the development and data used. Footnote 5 is a citation to the comprehensive ICRP report, "Recommendations of the ICRP, Report of the Committee on Permissible Dose for Internal Radiation--1958 revision; to be published, Pergamon Press, London, England."
> 
> I'm 99% sure that NCRP 22 is a compilation of tables of maximum permissible body burdens, concentrations in air, and concentrations in water, included and more fully documented in ICRP Publication 2, 1959, "Report of Committee II on Permissible Dose for Internal Ratiation (1959)." I very strongly suspect that your "ICRP-1955" citation refers to ICRP Publication 2.
> 
> I do not find ICRP 2 available on the internet, although it is described briefly at:
> 
> http://www.icrp.org/publication.asp?id=ICRP%20Publication%202
> 
> I have a xerox copy of the parts of ICRP 2 not included in NCRP 22. I also have a 30-page xerox copy of a 1962 supplement to ICRP 2, which includes errata. 
> 
> Back in graduate school at the Univ of Michigan in the early 1970s this entire package (including Handbook 69) was provided to us health physics students as the basis for almost all MPC values in 10 CFR Part 20. (Some values for Sr-90, I-131, and possibly Cs-137 were modified by the Federal Radiation Council.)
> 
> If you are located in the Washington, DC area, I would happily loan you this package. I would also be willing to send you a copy of the ICRP material (about 2 inches thick) at cost. (I also have a National Library of Medicine call slip showing a call number "WN 610 I62r 1959" for ICRP Publication 2.)
> 
> Regards,
> Thomas Potter
> 
> 
> ---- Original message ----
>> Message: 5
>> Date: Tue, 06 Nov 2012 23:59:03 +0000 (UTC)
>> From: Brad Keck <bradkeck at mac.com>
>> Subject: [ RadSafe ] Maximum Permissble Concentrations (NCRP 22)
>> To: "The International Radiation Protection (Health Physics) Mailing
>>     List"    <radsafe at health.phys.iit.edu>
>> Message-ID: <d50407cd-4063-6687-a412-ed9fee0ed428 at me.com>
>> Content-Type: text/plain; CHARSET=US-ASCII; format=flowed
>> 
>> RadSafers,
>> 
>> I am seeking a blast from the past.  I am trying to reproduce some calculations for MPC - as noted in NCRP 22 which in turn references ICRP-1955.  Can anyone provide a straightforward reference calculation of MPC, or maybe even provide the reference data  from ICRP-1955?  
>> 
>> In particular, I would like to understand the differences in assumptions involved between the MPC and our more modern ALI - I can't arrange a cocktail party for the effort, unfortunately - but maybe someone can help me out here with a bit of history?  
>> 
>> Best and Thanks,
>> 
>> Brad 
>> 
>> Bradly D. Keck, Ph.D., CHP
>> bradkeck at mac.com
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