RE: maximum permissible limits[Scanned]

["Christoph Hofmeyr" <chofmeyr@nnr.co.za>]

Dear Franz,

I understand it as a question of what probability in excess of the limit

one (or the lawmaker) is willing to accept.  The legal figure for a

limit (MPC) seems to me a number with zero associated uncertainty ("the

law is the law"), even if it is only a regulation.  The standard

deviation obtained in the measurement of the activity concentration can

be made smaller by investing more effort (longer measurement, etc).

Your first option (that favoured by the ASO) ensures that compliance is

95% assured (2xsigma) and would seem to reward a more precise

measurement, whereas the second would assure only 5% compliance and

seems to reward a less precise measurement (large sigma).  The latter

seems very lenient, except if the MPCs are ridiculously restrictive.

Chris Hofmeyr

chofmeyr@nnr.co.za





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

From: Franz Schoenhofer [mailto:franz.schoenhofer@CHELLO.AT]

Sent: 26 July 2002 07:59

To: radsafe@list. vanderbilt. edu (E-mail)

Subject: Fw: maximum permissible limits[Scanned]





I have only received two comments on my question, which did not answer

it. I

do believe that this question must be of really fundamental interest to

anybody, who is checking data for compliance with legal prescription.

Please, if you do not want to answer to the list, answer to me

personally.

So I post my question once again.



Franz





------------------------------------------------------------------------

----

-----------------------------------

>This comment raises for me a very important question: What is the

criterion,

>whether a maximum permíssible concentration has been exceeded? There

are

two

>extremes possible: Is it, that the measured value plus x sigma has to

be

>below the MPC or is it that the measured value has to be below the MPC

plus

>x sigma? The latter criterion is used in most regulations in Austria

>regarding contaminants in food (x=2). The criterion defined by the

Austrian

>Standardisation Organisation (which has to be regarded as a

recommendation

>and has no real legislative power) is coherent with the first extreme.

I

>wonder, what the legislation is in other countries.

>

>Best regards,

>

>Franz

>#

>

>

>

>***********************************************************************

*

>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/

>

>





************************************************************************

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/



************************************************************************

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/