[ RadSafe ] Tc-99 dics surface emission question

[Geo>K0FF]

Franz, this is the question, asking it directly of you, answer it without 
help.

REPOST OF THIS PART:
Forgive my inexperience. One more attempt to phrase the question so it won't
be misunderstood.

I have a 27 pCi Tc-99 test disc which is electroplated onto a stainless
steel disc.

How many beta particles per minute are expected to leave the front surface
of the disc?

Disregard self-absorption, half-life, counting error, confidence level, and
systematic error. Most of that has nothing to do with this calculation
anyway.

By knowing the expected beta emission rate, and then measuring the actual
detected rate by the sensor, the
beta efficiency at the Tc-99 energy for that sensor can be calculated.

 Reply to:

 George Dowell at

 GEOelectronics at netscape.com


If it is not understood, I will try to rephrase it.

George Dowell


----- Original Message ----- 
From: "Franz Schönhofer" <franz.schoenhofer at chello.at>
To: "'Robert Barish'" <robbarish at verizon.net>; <radsafe at radlab.nl>
Sent: Sunday, December 16, 2007 12:10 PM
Subject: AW: [ RadSafe ] Litroenergy


Thank you Robert, for forwarding the information about this patent. I have
followed it with much interest because I have conducted a research  on the
transfer of tritium from self-luminous dials to the human body almost 20
years ago, with quite interesting results - several thousands of Bq/l in
urine after only a few hours and days exposure from watches. Still the doses
were negligible.

These findings might not in any way apply to the claims of other RADSAFErs
and certainly not those of the new radiation protection specialist KOFF
(Finnish beer brand) on RADSAFE.

Expect more comments on this question later.

Best regards,

Franz

Franz Schoenhofer, PhD
MinRat i.R.
Habicherg. 31/7
A-1160 Wien/Vienna
AUSTRIA


-----Ursprüngliche Nachricht-----
Von: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Im Auftrag
von Robert Barish
Gesendet: Samstag, 15. Dezember 2007 22:03
An: radsafe at radlab.nl
Betreff: [ RadSafe ] Litroenergy

The patent information on the "new" light source can be viewed at:

http://www.freshpatents.com/Long-life-self-luminous-microspheres-dt20070830p
tan20070200074.php?type=description

What is most interesting is the various blog postings about this material.
Of particular interest is the posting of the company's engineer, Mr. Stark,
who states unequivocally that the material contains no tritium or any other
radiactive material, in contradictiction to both the patent description and
any logic that we on RADSAFE (or at least I) can bring to this subject!

See, for example, Steve Stark's December 11th posts at:

http://www.treehugger.com/files/2007/12/new_light_glows.php?q=

and

http://www.ecofriend.org/entry/flexible-light-source-for-247-lighting/

where he emphatically denies the use of tritium or any radioactive material,
despite the patent description.

How strange is this?

Robert Barish, Ph.D., CHP





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