ICX identiFINDER

Originally made by ICX Radiation which was then acquired by Thermo Scientific

"FWIW my source is labeled 1uCi and dated to Jul 2006 (also from Spectrum Techniques)

it reads ~3uSv/h on my spectrometer, which some napkin math tells me it should be ~0.1uCi

though the decay calculator says it should be 0.65uCi

In the non-Ultra models a built-in Cs-137 reference source (<15 nCi/500 Bq) is used for online stabilization and in-situ calibration without user interaction.

this is interesting. I assume your unit does not have an internal source"

"figured a bit more out with the my identifinder, it is complaining about the backup battery being dead (seems to be a smaller battery soldered in the unit) and is loosing its calibration on each bootup. From what I have been able to gather, the cs-137 calibration is mandatory at first boot but them it switches over to the blue led calibration on subsequent power cycles. That probably explains the smaller check source: on the standard it runs a 30s calibration with the 15nCi source at each boot, whereas in the ultra is runs a 180s calibration on the 3nCi once to calibrate the blue LED and then does a blue LED calibration (every 5s apparently)

there is also some sort of background subtraction that it does with the check source, the cs-137 spectrum peak doesn't show up in the downloaded spectrum. If you put an additional source you can still get counts there so its isn't just completely blanking out the area. not quite sure how it works, must just selectively delete some counts"

"I did end up ordering a main battery for mine, they are still available from FLIR in both nicad and removable battery (takes 4x AA) version. Almost would have been cheaper to buy another burner unit, it was almost $250 with tax and shipping"

Blue cap bs red cap?

Cal source

Peter unit: 3 nCi (hand written, 15 nCi crossed out)