[ RadSafe ] ] Po-210 in the news

[Miller, Mark L]

And let's not forget the equilibrium concentration of Po-210 in bone arising from the natural occurrence of Ra-226 in bone, 0.17 Bq/kg of a total of 1.7 Bq in the "average" human bones.  (UNSCEAR 1988 & NCRP 1988)


-----Original Message-----
From: gert.jonkers at shell.com [mailto:gert.jonkers at shell.com] 
Sent: Monday, July 09, 2012 6:47 AM
To: radsafe at health.phys.iit.edu
Subject: Re: [ RadSafe ] Po-210 in the news

RADsafers,

Indeed Po-210 do have a low detection limit, but how about the detection limit of Pb-210. Mr Arafat was a smoker as we may remember and as tobacco may contain relatively enhanced levels of Pb-210, the low concentrations mentioned may stem from Po-210 ingrowth from Pb-210 as well. I know the original announcement is mentioning unsupported Po-210, but it was not clear to me how (which analysis method and LoD?) the presence of Pb-210 was excluded. Anyone more information on the non-presence of Pb-210?

Kind regards,
Gert


-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Hill, Peter
Sent: Saturday, July 07, 2012 5:30 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Po-210 in the news

Steven,

Po-210 contents are usually assessed by means of alpha-spectroscopy. LOD's of 1 mBq/l are achievable. At CIMB-J already a level of 0.4mBq Po-210 may be detected in a 24h-sample of urine. Just routine.

Kind regards
Peter Hill
Head Competent Incorporation Monitoring Body - Jülich (CIMB-J)

Forschungszentrum Jülich GmbH
S-B
52425 Jülich


________________________________________
         From the Jerusalem Post article linked below:

"And yet, eight years after Arafat's death, the Swiss scientists reported finding polonium levels of 54 millibecquerels (mBq) and 180 millibecquerels on his belonging, considered to be high levels."

         By my reckoning, the former is 0.001 pCi, and the latter is 0.005 pCi.  If that is correct, how can levels this low be detected?  The error bars must be huge. . . .




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