931040P / 1014 4. IDENTIFICATION MESSAGES AND RADIONUCLIDE LIBRARY
Identification Category
Classify Mode ANSI Mode
45
U-233 Threat Nuclear Uranium
U-235 Threat Nuclear Uranium
U-238 Threat Nuclear Uranium
Unknown Peak Threat Other
Unknown/Beta emitter Threat Other
V-48 Innocent Medical
W-187 Innocent Industrial
W-188/Re-188 Innocent Industrial
Xe-127 Innocent Industrial
Xe-131m Innocent Other
Xe-133 Innocent Medical
Xe-133m Innocent Medical
Xe-135 Innocent Other
Y-88 Innocent Other
Y-91 Innocent Industrial
Yb-169 Innocent Medical
Zn-62 Innocent Medical
Zn-65 Innocent Medical
Zr-95 Innocent Medical
4.1. Comments on Classify Mode Messages
The following explains the criteria for selected Classify ID Display Mode messages.
HEU (highly enriched uranium)
This message is displayed if the major lines of uranium are detected, and the ratios of the
intensities of the lines indicates the
235
U content to be above about 70%.
Am241 (unshielded) in the “Industrial” category
This message is displayed if the 59 keV peak is located. It could mean that an
241
Am source
such as a smoke detector is present. Move closer to the source and/or count longer. This will
allow the higher-energy gamma rays to accumulate in the spectrum, in case plutonium is also
present.
Unknown peak and Unknown/Beta emitter
This indicates the gamma count rate is higher than can be accounted for based on the peaks
in the Detective-EX library. The implication is that either an unexpected nuclide or a beta
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