Re: Radioactive Decay Data Tables

[Brian_Gaulke@hc-sc.gc.ca]

Brian Gaulke
01/15/99 04:56 PM

If you look at the end of the second column in Appendix 1, you'll see that
the digits you refer to represent the stated uncertainty in the
corresponding number of digits at the end of the preceding value.  In your
example, 477.593 12 means 477.593 + or - 0.012.  It isn't stated, however,
whether these are 1 sigma uncertainties, or some other confidence level.

Brian R. Gaulke
Head, Dosimetry Section
Radiation Protection Bureau
Health Canada
(613) 941-0143
brian_gaulke@hc-sc.gc.ca





mrichar @ iupui.edu on 99-01-15 03:58:04 PM

Please respond to radsafe@romulus.ehs.uiuc.edu

To:   radsafe @ romulus.ehs.uiuc.edu
cc:    (bcc: Brian Gaulke)
Subject:  Radioactive Decay Data Tables




Radsafers:
This question came from the director of our nuclear medicine technology
training program.  The reference entitled "Radioactive Decay Data Tables -
A
Handbook of Decay Data for Application to Radiation Dosimetry and
Radiological Assessments"  (David C. Kocher - NTIS Publication) provides
decay data for a large number of radionuclides.  The energy (keV),
intensity
(%), and mean energy emitted per cumulative activity (g-rad/uCi-h) is
provided for each radiation emitted from a given radionuclide.
When examining the data tables, it is noted that in most cases, the value
for the radiation energy and the value for the intensity is followed by a
space and then an integer.  For example, the energy data for Be-7 indicates
a gamma energy of 477.593 12 with an intensity of 10.42 10.  Does anyone
know what the numbers "12" and the "10" mean?  I reviewed the information
prior to the data tables and can't find anything regarding the relevance of
these numbers.
My bit of radiation trivia for the week.
Mack L. Richard, M.S., C.H.P.
Radiation Safety Officer - Indiana Univ. Med. Cntr.
Phone #: (317) 274-0330   Fax #: (317) 274-2332
E-Mail Address:  mrichar@iupui.edu
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