Thin mica window detects alpha, beta, and gamma radiation. Operating range is 450-600 volts, the recommended voltage is 500 volts. Recommended anode resistor: 10 megaohms. Gas filling. Neon and halogen. Measures .36" (9.1 mm) wide, 1.6" (40 mm) long.

Detects alpha radiation through the thin mica front window.

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Glass GM Tube detects beta and gamma radiation. Tube dimension are approximately .375" (3/8") diameter by 4" in length. Operating voltage is 400 volts.

Recommended anode resistor: 4.7 megaohms.

Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.

Russian GM Tube detects beta and gamma radiation (SMB20 or equivalent). Operating range is 350-475 volts, the recommended voltage is 400 volts. Recommended anode resistor: 5.1 megaohms. Gas filling - Neon, Argon and Bromine. Measures 11 mm in diameter by 101 mm long.

Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.

Small Russian GM Tube detects beta and gamma radiation (SMB10 or equivalent). Operating range is 370-480 volts, the recommended voltage is 400 volts. Recommended anode resistor: 3.3 megaohms. Gas filling. Neon and halogen. Measures 6mm in diameter by 35mm long.

Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.

Small GM Tube detects beta and gamma radiation. Operating range is 450-650 volts, the recommended voltage is 500 volts. Recommended anode resistor: 3.3 megaohms. Gas filling. Neon and halogen. Measures .19" (4.83 mm) wide, .63" (15.9 mm) long.

Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.

Small GM Tube detects beta and gamma radiation. Starting Voltage 330 Volts, the recommended voltage is 400 volts. Recommended anode resistor: 2.2 megaohms. Gas filling. Neon and halogen. Measures .236" (6 mm) Outer Diameter, 1.339" (34 mm) long.

Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.