[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: ANNUAL DOSE, DOSERATE and the MAXIMUM INDIVIDUAL
Article 13
The Directive has decreased the effective dose limit for
members of the public from 5˙mSv to 1˙mSv in a year; in
special circumstances, a higher effective dose may be
authorised in a single year, provided that the average
over five consecutive years does not exceed 1˙mSv per
year.
The equivalent dose limits for the lens of the eye and for
the skin are unchanged. Their purpose is to protect
against deterministic effects, for which scientific
information indicates no need for change. However, the
limit for the skin now applies to the dose averaged over
any 1 cm2 of skin, regardless of the area exposed.
Equivalent dose limits for the hands, forearms, feet and
ankles are no longer seen as necessary. Compliance with
the effective dose limit alone is not always sufficient to
prevent the occurrence of deterministic effects on some
organs or tissues. It is therefore necessary to ensure
compliance with both the effective dose limit and the
equivalent dose limits.
The dose limits apply to the sum of the doses to
members of the public due to exposure to all relevant
sources received in one year, through all exposure
pathways.
the use of equivalent methods (Article 15), it is recom‹
mended that these be kept in line with internationally
recognised scientific guidance.
With regard to the estimation of effective dose for
internal exposure, Annex III gives dose coefficients for
different chemical and physical forms that have been
considered for the listed radionuclides and corre‹
sponding parameter values. If specific information is not
available, the indicated default parameters may be used.
On the other hand, whenever information is available
which permits a better estimation of the parameter values
and corresponding dose coefficients, competent auth‹
orities may authorise the use of such information to
calculate effective dose to workers and to members of
the public.
Article 14
This Article requires optimisation of protection to be
made not only with respect to individuals but also to the
population as a whole.
Specially authorised exposures replace the planned
special exposures from Directive 80/836/Euratom.
Experience on the application of planned special
exposure under the terms of the 1980 Directive has
shown that they have been applied very seldom if at all.
A specially authorised exposure would involve an
The second paragraph requires regular assessments of
the total of contributions to the exposure of the popu‹
lation from practices. The objective is to enable
competent authorities and undertakings to identify
trends in the pattern of exposures in particular where
actions to reduce doses might be warranted. See also
Article 45.
Dear Quintino,
Thank you for your message,
I understood your point of view and I know in Italy and in general the
European Community with the introduction of the Council Directive
96/29/Euratom of 13 May 1996, which took into account the ICRP 60
recommendation, do not use more the Concept of Derived Limit. Instead they
use the concept of Dose Constraint to Optimization of the practice. No doubt
to sources with high activity and possibility of incidents and accidents, as
in Industrial Radiography, the constrain is of order of 30% of the limit
assures to public a dose below than 1 mS/y, even considering they could be
submitted to other sources of radiation.
Jose Julio Rozental
jrozental@hotmail.com
>From: Quintino De Notariis <qdenotariis@novacon.it>
>Reply-To: Quintino De Notariis <qdenotariis@novacon.it>
>To: <radsafe@list.vanderbilt.edu>
>Subject: Re: ANNUAL DOSE, DOSERATE and the MAXIMUM INDIVIDUAL
>Date: Thu, 12 Sep 2002 14:35:50 +0200
>
>Jose,
>
>Thank you for your comment.
>
>I have to clarify that my country didn't adopt 0,114 microSv/h as a
>"derived
>limit" so that compliance with it could ensure compliance with the REAL
>REGULATORY LIMIT of 1 mSv/h (Effective Dose).
>
>My post meant to know if it is reasonable for a hp or an inspector to claim
>that "SINCE the annual regulatory limit is 1 mSv/y THEN the limit in an
>hour
>in a location MUST BE 0,114 microSv/h IN EVERY CIRCUMSTANCE, even if NOBODY
>stays in that location or if somebody stays 1 or so hours per year".
>So an instrument MUST read ALWAYS LESS than 0,114 microSv/h.
>
>In other words, they assume a MODEL in wich a member of the public stays in
>that location 8760 hours/y, without regard to the real situation, and
>claiming that that is what the regulation IMPLIES (hypothesis of the
>Maximum
>individual); that's to say, they INVENT the derived limit of 0,114
>microSv/h
>and claim that it is a regulatory limit.
>
>I think that this model is unreasonable.
>
>As to your resume of the ICRP 60, I would greatly appreciate it. Thanks in
>advance.
>
>Quintino De Notariis
>
>
>
>
>
>Il giorno 11-09-2002 18:04, J. J. Rozental, jrozental@hotmail.com ha
>scritto:
>
> >
> > The term limit should only be used for a criterion that must not be
> > exceeded.
> > Many countries adopt the derived limit: A limit on a measurable quantity
> > set, on the basis of a model, such that compliance with the derived
>limit
> > may be assumed to ensure compliance with a primary limit.
> >
> > The ICRP limit of 1mSv is the total dose which should arise from all
> > man-made sources of radiation exposure (excluding medical procedures).
> > Dose limits for skin and lens of the eye are 50 mSv and 15 mSv per year,
> > respectively.
> >
> > If you are interested I can send by e-mail a resume in power point of
>the
> > ICRP 60, interesting to explain the System.
> >
> > Jose Julio Rozental
> > jrozental@hotmail.com
> > Madrid, until 2-10-2002
>
>************************************************************************
>You are currently subscribed to the Radsafe mailing list. To unsubscribe,
>send an e-mail to Majordomo@list.vanderbilt.edu Put the text "unsubscribe
>radsafe" (no quote marks) in the body of the e-mail, with no subject line.
>You can view the Radsafe archives at http://www.vanderbilt.edu/radsafe/
>
_________________________________________________________________
Únase al mayor servicio mundial de correo electrónico:
http://www.hotmail.com/es
************************************************************************
You are currently subscribed to the Radsafe mailing list. To unsubscribe,
send an e-mail to Majordomo@list.vanderbilt.edu Put the text "unsubscribe
radsafe" (no quote marks) in the body of the e-mail, with no subject line.
You can view the Radsafe archives at http://www.vanderbilt.edu/radsafe/