What level should we shield to?

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

>X-Sender: dsimpkin@mail.execpc.com (Unverified)
>Date:         Mon, 23 Mar 1998 16:09:24 -0600
>Reply-To: Medical Physics Mailing List <MEDPHYS@LISTS.WAYNE.EDU>
>Sender: Medical Physics Listserver <medphys@lists.wayne.edu>
>From: Douglas Simpkin <dsimpkin@EXECPC.COM>
>Subject:      What level should we shield to?
>To: Multiple recipients of list MEDPHYS <MEDPHYS@LISTS.WAYNE.EDU>
>
>
>         ** Mail from Medphys Listserver **
>If you reply to this message, it will be posted on Medphys for all the
>subscribers to review ...
>
>
>Regarding "what level to shield to", I can tell you the status of the
>deliberations of the committee rewriting NCRP Rep. 49. But of course the
>manuscript has not yet been through NCRP review, so any conclusions would be
>premature.
>
>We see 2 levels of "design dose" in the environs of a new radiation
>installation:
>
>Controlled (=NRC "restricted") areas: 500 mrem/yr = 5 mSv/yr. This was
>arrived at as:
>     1) a fraction (= 1/2) of the long term 1,000 mrem/yr limit in NCRP 116,
>p. 35, and
>     2) a permitted level to the fetus of a pregnant worker
>
>Uncontrolled areas: 100 mrem/yr = 1 mSv/yr (dictated by NCRP 116, p. 46).
>
>Comments?
>Douglas J. Simpkin, Ph.D. <dsimpkin@execpc.com>
>Certified Radiation Physicist
>St. Luke's Medical Center
>Milwaukee, WI 53125
>
>phone: 414-649-6457
>fax: 414-649-5061
>