Spectral Analysis

["Perrero, Daren" <Perrero@IDNS.STATE.IL.US>]

This is definitely not my strong suite so any help here is appreciated.  The

situation involves a field test using a portable MCA.  Field readings give

dose rates of approximately 100 mr/h near contact and 10 mr/h at a foot from

a discrete source with no markings.  However a limited time (approx  5 min)

NaI spectra out to 2.5 MeV does not show a discernible peak.   What type of

nuclide could be producing these readings?  If a beta emitter was here

wouldn't there at least be an x-ray peak produced from the capsule material?





Eventually a lab quality spectra will be obtained and the mystery solved but

it would be nice to have some idea (or at least a couple of good guesses) of

what's being transported before it gets to the lab.



Daren Perrero

Health Physicist

Illinois Department of Nuclear Safety

(217) 785-9929

perrero@idns.state.il.us



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