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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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