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Differential Gamma Ray Spectrometer

Geophysics · Physics

A brown case with a rectangular footprint contains an orange-coloured metal instrument in a brown leather holder. The case has two latches and a brown plastic handle on the front case. On either side of the case is a foam liner with recesses for holding various components. The words “Jetliner” is moulded into the handle’s metal hinge.

The instrument’s holder has a cut out window through which the instrument’s display can be read. Two metal rings at either side may be used to attached a narrow shoulder strap, which is also included inside the case.

The instrument has a carrying handle and two knobs at the top surface, as well as cavity containing a source. The bottom has a cavity for holding “c” cell batteries, which is empty.

Also in the case is an orange painted metal mounting bracket and a key for locking the case.

Accession Number:

Alternative Name: Scintillometer; minispec; UG135

Primary Materials: Plastic, Metal


A label on the front face of the instrument indicates that the model number is “UG135”.

A serial number engraved into the top surface of the instrument reads “SN90112”.

Dimensions (cm):

(Box) Height = 15, Width = 20, Length = 45.


A gamma ray spectrometer measures the spectrum and intensity of gamma radiation.


Excellent: This instrument appears to have been very lightly used. One edge of the the interior liner in the case lid appears to be separating.

Associated Instruments:

Manufacturer: Urtec Limited, Uxbridge, Ontario.

Date of Manufacture: c. 1980s.


This instrument was among a set that was acquired for a teaching experiment in the University of Toronto Department of Physics Geophysics teaching lab. The experiment was called “Gamma-Ray Detection Using a Scintillometer.”

This instrument was gather by the UTSIC curator Erich Weidenhammer from Dr. David Bailey at the Advanced Physics Lab on September 3rd 2019.

Additional Information and References:

Historical Notes:


  • Donated to UTSIC