[ RadSafe ] Sv vs. Gy

[WHILLANS David -NUCLEAR]

George,

You might also note that in ICRP-60 (1991), para 74, after a review of the human and experimental animal evidence ICRP decided that the DDREF should be applied only for "absorbed doses below 0.2 Gy and from higher absorbed doses when the dose rate is less than 0.1 Gy per hour". This review was discussed, I believe, in an earlier UNSCEAR report.

Regards,

Dave Whillans  (former Lowell course student)

D.W. Whillans, Senior Scientist
Health Physics Department
Nuclear Regulatory Programs
Ontario Power Generation-Nuclear
1549 Victoria Street East (P58)
Whitby, Ontario L1N 9E3
Phone 905-430-2215 ext3201
FAX 905-430-8583
david.whillans at opg.com 

-----Original Message-----
From: radsafe-bounces at agni.phys.iit.edu [mailto:radsafe-bounces at agni.phys.iit.edu] On Behalf Of George Chabot
Sent: Tuesday, October 19, 2010 3:06 PM
To: 'The International Radiation Protection (Health Physics) MailingList'; radsafe at agni.phys.iit.edu
Subject: Re: [ RadSafe ] Sv vs. Gy

Mike, the issue of when and at what dose level absorbed dose and equivalent
dose quantities should be used was at least partially addressed in an answer
to question #8542 on the HPS Ask the Experts web site at
http://hps.org/publicinformation/ate/q8542.html.  

George Chabot
Prof. Emeritus, Univ. of Massachusetts Lowell
George_chabot at uml.edu

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Stabin, Michael
Sent: Tuesday, October 19, 2010 1:32 PM
To: radsafe at agni.phys.iit.edu
Subject: Re: [ RadSafe ] A question of semantics

> One of our trainers referred to 'x-radiation'. I understand what he means,
but have not seen it called antyhing other than x-rays or 'fluorescent
radiation' in my manuals from Cember Knoll, etc.... Is this a legitimate
word to use in training?
>Luke McCormick

Good question, I would like to hear from others. I would not say this, but I
don't see that it is incorrect in any way. From my time on the Part I panel,
I have been convinced that the appropriate usage of "x ray" is like that,
space, no hyphen, unless you are using it as an adjective, then "x-ray
beam", for example.

One thing I would like to know is above what dose level we should not use Sv
and use only Gy, and why that level. I've asked some of the best, and still
have no clear explanation.


Mike

Michael G. Stabin, PhD, CHP
Associate Professor of Radiology and Radiological Sciences
Department of Radiology and Radiological Sciences
Vanderbilt University
1161 21st Avenue South
Nashville, TN 37232-2675
Phone (615) 343-4628
Fax   (615) 322-3764
e-mail     michael.g.stabin at vanderbilt.edu
internet   www.doseinfo-radar.com

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