[ RadSafe ] surface emission rate,surface DPM from 27 pCi Tc-99
GEOelectronics at netscape.com
Fri Dec 14 16:14:37 CST 2007
Franz says "RADSAFErs,
Is there anybody out there who knows this person, who wants to proof that
all those excellent experts on RADSAFE are idiots?????"
*Franz, you called them idiots, not I, not my intent or style, and you
publicly posted private eMails. Shame. George
Franz says" There is no confusion, there is no problem in translation (I
think and have
been assured by many hundreds of English native speakers that my English is
*Franz, it's not the words you use, it is the tone you use. George
Franz says:" The relation between the outdated, but in a few states in this
world (e.g. USA) still used "pCi" to the disintegrations per minute or
rather disintegration per second (Bq) is internationally fixed. "
*Franz, It's an old disc. George
Franz says:" There is a really terrible confusion by Mr KOFF (Finnish beer
brand - short
for Synebrychoff). He seems not to know that DPM means "disintegration per
minute), which refers to the radioactive substance and is independent of any
"front working surface" (whatever this might be), any self absorption. It is
not related to any beta efficiency, not of any probe. "
*Franz, my name is George Dowell K0FF is something else. It is K-ZERO-FF.
The front working surface is the one on the other side of the back surface,
which in this case does not work. George
Franz says:" Furthermore I would have hoped that Mr. KOFF knows the
dpm (disintegrations per minute) and cpm (counts per minute). Obviously he
does not. "
*Franz, DPM or disintegrations per minute can be 2-pi steradian, or 1/2 of a
sphere, or 4-pi steradian or both halves of a sphere.
DPM is determined by activity level multiplied by probability of emission
for each radiation component of a nuclide. CPM is COUNTS per minute, which
is derived as the product of source DPM, subtended angle, probe efficiency,
and deadtime correction. CPM also has other meanings. George
Franz says:" Having worked more than thirty years on the determination of
can assure everybody, that there is no interest in "how many particles are
leaving the test disc, but the most important analytical question is, what
the efficiency (both chemical and counting) is in order to translate cpm
into dpm. Am I missing something? This is the task of radionuclide
determination since probably 100 years!!!! "
*Franz, yes you are missing the whole point of the measurement. Yes it does
have uses. George
Franz says:" I would not be surprised if you would still not understand how
question was and even more that you insist on your less than amateurish
opinion. I do not expect that you will refrain from those silly postings. I
do not hopte that you will bother RADSAFE in the future. "
*Franz, hope in one hand..............
I'm here to share what I can, but especially to learn. That is supossed to
be, at least in part, the charter of this chat board. George
Franz Schoenhofer, PhD
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