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RE: Radioactive Decay Data Tables
Mack,
The numbers indicate the amount of uncertainty in the values given.
Appendix 1 of Kocher gives the following examples.
3.624 12 3.624+0.012
2.6 h 12 2.6+1.2 h
2.1E5 y 2 (2.1+0.2) X 10E5 y
Gary
> -----Original Message-----
> From: Richard, Mack L [SMTP:mrichar@iupui.edu]
> Sent: Friday, January 15, 1999 4:04 PM
> To: Multiple recipients of list
> 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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