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The GM-45 is a good, bare-bones radiation detector from Black Cat Systems. It is a detector only and needs to be attached to a computer or counter. The communication interface is RS-232 and reading data from it is super easy -- I've written a Geiger counter app in one line of Bash script.

GM-45 Specifications

Size: 5.3 by 3.4 by 1.5 inches (135 by 86 by 38 mm)

Weight: 9.3 ounces (264 grams)

Window: Mica, 1.75 mg/cm2 1.75 inch / 44.5 mm diameter Minimum allowed atmospheric pressure: 540 torr (8,000 ft altitude)

Radiation detected: Alpha - Above 3 MeV Beta - Above 50 keV Gamma / X-Ray - Above 7 keV

Power requirements: Self powered from computer

Computer Hardware Requirements:

       USB version - USB port
       Serial versions - One available serial port
       Macintosh: PowerPC processor
       Windows: Pentium or better

Computer Software Requirements: Windows 98/2000/NT/XP/Vista/Windows 7 Macintosh MacOS 7.6 to 9.2, OSX 10.1.2 or later

Software Features: Built in graphing Ability to store data to disk for further analysis User selectable integration times Built in statistics package Trend line may be superimposed over graphed data "Geiger Counter" clicking may be enabled

Package includes: GM-45 Unit CD-ROM with software for both Windows and Macintosh Appropriate serial cable - please order the correct version for your system, three are available: 1. Windows with 9 pin serial port 2. Windows with 25 pin serial port 3. Macintosh with 8 pin serial port

GM-45 Performance:

Gamma Energy Response
Gamma Energy Response