Detectors

In a nutshell, the difference between the GM-10 and GM-45/90 is the size of the detector. The surface area of the GM-45 detector is 24 times as large. This means that it is much more sensitive for alpha and beta radiation, and somewhat more sensitive for gamma / x-ray radiation. That is, it will be able to detect much smaller (weaker) levels of such radiation. And the GM-90 has two of the detector tubes used in the GM-45, for twice the sensitivity.

GM-10 Specifications

Size: 		4.25 by 2.6 by 1.2 inches (108 by 66 by 30 mm)

Weight: 	3.6 ounces (102 grams)

Window:		Mica, 1.75 mg/cm2
		0.36 inch / 9.1 mm diameter
			
Radiation detected:
	Alpha - Above 3 MeV
	Beta - Above 50 keV see our Beta Ray Sensitivity specs.
	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-10 Unit
	CD-ROM with software for both Windows and Macintosh

	USB Version:
	Built in USB cable

	Serial version:
	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-10 Performance:

Gamma Energy Response

Cobalt 60 Sensitivity

Cesium 137 Sensitivity

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

Cobalt 60 Sensitivity

GM-90 Specifications

Identical to the GM-45, except the GM-90 has two pancake detector tubes, for twice
the sensitivity of the GM-45.





GM-180 Specifications
Identical to the GM-45, except the GM-180 has four pancake detector tubes, for four times
the sensitivity of the GM-45, and the enclosure is larger.