RE: NORM by definition -Reply

[Craig Reed <CReed@novoste.com>]

Don't have a copy, but I think NCRP 118 - Radiation Protection in the
Mineral Extraction Industry, describes natural leaching as one process
that disrupts equilibrium.

Craig Reed
creed@novoste.com

> -----Original Message-----
> From:	Jonkers, Gert SIC-CTAN/2 [SMTP:Gert.G.Jonkers@opc.shell.com]
> Sent:	Friday, December 11, 1998 10:21 AM
> To:	Multiple recipients of list
> Subject:	RE: NORM by definition -Reply
> 
> Group,
> 
> Just a short explanation, what should be interpreted as Bq(total):
> 
> Assuming that no Th-232 is present and a secular equilibrium of say 10
> Becquerel for each member of the U-238 series:
> Bq(total) would amount to 14 (number of member of the series) time 10
> equals
> 140 Bq(total)
> 
> Assuming that no Th-232 is present and secular sub-equilibria of say
> 0.1
> Becquerel for U-238 till Th-230, 10 Bq for Ra-226 till Po-214 and 30
> Bq for
> Pb-210 till Po210:
> Bq(total) would amount to 5*0.1+6*10+3*30 = 150.5 Bq(total),
> (excluding
> any uncertainty in measured values)
> 
> So what I really like to obtain is analysis reports (or references to
> these
> data) showing that there is no secular equilibrium in the naturally
> occurring U-238 and Th-232 decay series.
> 
> Kind Regards, Gert Jonkers 
> CTAN - Analytical - Nuclear Measurement Techniques
> http://sww.ksla.shell.nl/analytical/skills/nuclearmea/1.html
>    Radiotracer applications, 
>    Gamma-transmission and Neutron BackScatter (NBS) measurements
>    Naturally Occurring Radioactive Materials (NORM)
>    Radiological Protection Advice
> Shell Research and Technology Centre, Amsterdam (SRTCA), 
> http://www.srtca.shell.nl/welcome.html
> PO Box 38000, NL-1030 BN Amsterdam, the Netherlands
> tel.        +31 - 20 - 630 3424
> fax        +31 - 20 - 630 2911
> e-mail   Gert.G.Jonkers@OPC.Shell.COM
> 
> > ----------
> > From: 	Joelle Key[SMTP:jkey@mail.state.tn.us]
> > Sent: 	1998-12-11 15:24
> > To: 	Multiple recipients of list
> > Subject: 	NORM by definition -Reply
> > 
> > I realize that you do not want to get into a huge discussion about
> > the background information you provided... but I would appreciate
> > a clarification.  
> > 
> > I have excerpted your statement about limits.  Do I understand
> > you correctly that all "non-natural" material is exempted if it
> > contains 100 Bq/g or less?
> > 
> > Joelle Key
> > TN DRH
> > jkey@mail.state.tn.us
> > 
> > >>> "Jonkers, Gert SIC-CTAN/2"
> > <Gert.G.Jonkers@opc.shell.com> 12/11/98 05:46am >>>
> > ***snip, snip****
> > 
> > BACKGROUND:
> > the current Dutch legislations states an exempt limit for 'natural'
> > materials of 500 Bq(total) per gramme material, and 100
> > Bq(total) per gramme
> > for 'non-natural' or 'artificial' materials. 
> > 
> > ****snip, snip*****
> > 
> > Kind Regards, Gert Jonkers 
> > CTAN - Analytical - Nuclear Measurement Techniques
> > http://sww.ksla.shell.nl/analytical/skills/nuclearmea/1.html
> >    Radiotracer applications, 
> >    Gamma-transmission and Neutron BackScatter (NBS)
> > measurements
> >    Naturally Occurring Radioactive Materials (NORM)
> >    Radiological Protection Advice
> > Shell Research and Technology Centre, Amsterdam (SRTCA), 
> > http://www.srtca.shell.nl/welcome.html
> > PO Box 38000, NL-1030 BN Amsterdam, the Netherlands
> > tel.        +31 - 20 - 630 3424
> > fax        +31 - 20 - 630 2911
> > e-mail   Gert.G.Jonkers@OPC.Shell.COM
> >
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