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GM-10 / GM-45 / GM-50 / GM-90 Geiger Counter Nuclear Radiation Detectors

Comparison of features

Feature GM-10 GM-45 GM-50 GM-90 GM-180
Radiation Detected Alpha
Beta
Gamma
Alpha
Beta
Gamma
Gamma Alpha
Beta
Gamma
Alpha
Beta
Gamma
Cs137 Sensitivity 1200 CPM/mR/Hr 3000 CPM/mR/Hr 6500 CPM/mR/Hr 6000 CPM/mR/Hr 12000 CPM/mR/Hr
Co60 Sensitivity 1080 CPM/mR/Hr 3600 CPM/mR/Hr 7800 CPM/mR/Hr 7200 CPM/mR/Hr 14400 CPM/mR/Hr
GM Tube Dimensions 0.59 inches dia by 1.61 long
(15 mm dia by 41 mm long)
1.75 inches dia by 0.61 high
(44 mm dia by 15 mm high)
0.625 inches dia by 9.0 long
(16 mm dia by 229 mm long)
1.75 inches dia by 0.61 high
(44 mm dia by 15 mm high)
(Note: Uses two tubes)
1.75 inches dia by 0.61 high
(44 mm dia by 15 mm high)
(Note: Uses four tubes)
Enclosure Dimensions 4.25 by 2.6 by 1.2 inches
(108 by 66 by 30 mm)
5.3 by 3.4 by 1.5 inches
(135 by 86 by 38 mm)
9.25 by 7.38 by 2.25 inches
(235 by 188 by 57 mm)
5.3 by 3.4 by 1.5 inches
(135 by 86 by 38 mm)
7.1 by 5.0 by 1.6 inches
(180 by 127 by 41 mm)
Price RS-232 Version $199.00 $349.00 $349.00 $649.00 $949.00
Price USB Version $249.00 $399.00 $399.00 $699.00 $999.00

Volume and academic pricing available, please contact us at info@blackcatsystems.com for details.


The GM-10 and GM-45 models are our most popular nuclear radiation detectors, and work well for most applications. The GM-90 has two pancake geiger tubes in it, giving it twice the sensitivity of our GM-45. The GM-50 is suitable when you only wish to detect gamma and x-ray radiation. We offer both USB and RS-232 interfaces for our detectors. Please feel free to contact us info@blackcatsystems.com if you have any questions about our products, and we would be pleased to assist you.

Each of our detectors contain one or more geiger mueller tubes, capable of detecting radiation. Each time a radiation particle enters the sensing window, it is detected, and the software on the attached computer is informed of this event.

By adding up the number of detections per minute, the Counts Per Minute (CPM) is calculated and displayed in the included software. This number is a relative indicator of the amount of radiation present.

The difference between the models is the size of the tube - the GM-45 has a much larger surface area tube (over 23 times as large). This means that it can detect many more particles, giving a better reading. Vist the Specs page for a full comparison. Also be sure to visit our page comparing the readings between the GM-10 and GM-45.

The newly available GM-90 has two pancake detector tubes, for twice the sensitivity of the GM-45!

The GM-50 contains a large geiger tube for gamma-only detection, with the highest gamma sensitivity of any detector we sell.

Due to various sources of radiation, both man-made (fallout from nuclear testing in the 1950's and 1960's) and natural (such as radon, cosmic rays, and the like), there is always some background radiation present. The GM-10 and GM-45 can even detect radiation from the trace levels of uranium and thorium found in the rock making up granite countertops.

This background radiation level varies, depending on your location, and even the local weather. There are also short term statistical variations. This means that the CPM will vary over a short period of time, centered over what can be considered the actual average value.

Since the detectors are self powered by the computer's serial port, no batteries or external power adapters are needed! You can operate them anywhere you can take your computer or laptop!

Click on an image below for a larger picture:

GM-10:

A USB version of the GM-10 is also available:

GM-45:

GM-45 USB:

GM-90:

GM-90 USB:

GM-180:

GM-180 USB:

GMI:

GMI USB:



Thinking of buying a surplus CDV-700 or 715 detector? Be sure to read our report first.