[ RadSafe ] Fwd:Cosmic Beryllium? RadSafe post from m.c.baehler at bluewin.ch

[parthasarathy k s]

You may also get details about cosmic ray produced Be-7 from UNSCEAR 
publications.

Regards
Parthasarathy




________________________________
From: Stewart Farber <radproject at sbcglobal.net>
To: Jerry Cohen <jjcohen at prodigy.net>; The International Radiation Protection 
(Health Physics) Mailing List <radsafe at health.phys.iit.edu>
Sent: Sat, 19 March, 2011 13:00:57
Subject: Re: [ RadSafe ] Fwd:Cosmic Beryllium? RadSafe post from 
m.c.baehler at bluewin.ch

Hi Jerry,
No, airborne Be-7 is not a joke.

Check a reference book on Environmental Radiation Surveillance, or Eisenbud's 
Environmental Radioactivity, ] and you will see a discussion of cosmogenic Be-7 
produced continuously in the atmosphere, which can be seen in surface air 
sampling. It's concentration varies depending on solar flux and season which 
influences how much mixing occurs between the stratosphere and lower atmosphere. 

It has a 58 day half-life so it builds to a certain level and can be seen in any 

decent  particulate air sample analyzed with a good  gamma spectroscopy  system.

For example, see:
<http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V3S-4G3CBV4-1M&_user=10&_coverDate=12%2F31%2F2003&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1684781260&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0517f5a828361e6e1a95eb26a1ff83d6&searchtype=a>



Stewart Farber, MSPH
Farber Medical Solutions, LLC.
Bridgeport, CT 06604


[203] 441-8433 
website: http://www.farber-medical.com




________________________________
From: Jerry Cohen <jjc105 at yahoo.com>
To: The International  Radiation Protection (Health Physics) Mailing List 
<radsafe at health.phys.iit.edu>
Sent: Sat, March 19, 2011 1:02:41 AM
Subject: Re: [ RadSafe ] Fwd:Cosmic Beryllium? RadSafe post from 
m.c.baehler at bluewin.ch

Cosmic Beryllium??    Is this a joke?



________________________________
From: Jeff Terry <terryj at iit.edu>
To: The International Radiation Protection (Health Physics) Mailing List 
<radsafe at health.phys.iit.edu>
Sent: Fri, March 18, 2011 8:01:42 PM
Subject: [ RadSafe ] Fwd: RadSafe post from m.c.baehler at bluewin.ch

FYI

Begin forwarded message:

> From: radsafe-owner at health.phys.iit.edu
> Date: March 18, 2011 9:59:01 PM CDT
> To: radsafe-owner at health.phys.iit.edu
> Subject: RadSafe post from m.c.baehler at bluewin.ch 
> 
> From: marco bähler <m.c.baehler at bluewin.ch>
> Date: March 18, 2011 9:58:44 PM CDT
> To: "The International Radiation Protection (Health Physics) Mailing List" 
><radsafe at health.phys.iit.edu>
> Subject: Fwd: particle samplers
> 
> 
> dear radsafers ,
> 
>> I invite you to get perspex plates (from a quarter to one half square meter ) 


>>or something similar . make them warm with a potent hairdryer or something 
>>similar ( i do it in the baking oven).  heat up vaseline ( a petroleum product) 
>
>
>>and draw it with a syringe when liquid. spread on perspex and distribute with 
>>large flat brush . for a quarter sq meter required about 5 to max 10 cc 
>>vaseline.
>> lay it out horizontally and secure against windforces.
>> this is an excellent particulate sampler. if you want to know about the 
>>residues, shave the vaseline off with a spatula and put it in your spectrometer 
>
>
>>leadcastle. you can also provide a contam monitor with little pointed feet 
>>(screws) of two or three millimeters, rest it on the exposed perspex and let it 
>
>
>>run in scaler mode. so you will eventually have an idea if there is something 
>>deposited beside of cosmic beryllium  (i can measure it easily).
>> good luck and enjoy sampling, I just come from reading that particules arrived 
>
>
>>in california.
>>  marco
>> 
>> 
>> 
>> 
>> 
>> marco
> 
> let me know what you found!
> 
> 
> 
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