Specialized - Radiation Counter ·GeigerMullerCounter
Self-quenching Geiger-Müller counter for beta and gamma radiation detection and measurement. The gas-filled tube provides pulse-counting response for general radiation survey and laboratory instrumentation.
The 1B67 (also designated as the 1B67/VG-10A) is a self-quenching Geiger-Müller counter tube designed for the detection of beta and gamma radiation. Manufactured by The Victoreen Instrument Company, this specialized gas-discharge device is engineered to operate in the Geiger region to detect ionizing radiation events. It features a thin window for admitting beta particles, a robust mechanical flange connection, and a high-voltage coaxial electrode configuration.
The physical design of the 1B67 is optimized for radiation detection and secure mounting. The tube features a cylindrical main body with a thin window at one end and a mounting flange at the other.
To allow beta particles to enter the active volume of the counter, the tube is constructed with a thin window:
The mechanical structure is defined by the following dimensions and electrical connection points:
The electrical connections are integrated into the mechanical mounting system:
The 1B67 operates as a self-quenching radiation detector. Its electrical parameters define its performance within a Geiger-Müller counter circuit.
The tube requires a high direct-current (d.c.) potential to establish the electric field necessary for gas multiplication:
The plateau length of at least 200 V ensures stable operation even if the high-voltage power supply experiences minor fluctuations around the nominal 1200 V operating point. The plateau slope of no more than 5.0% per 100 V indicates that the count rate remains highly consistent across this voltage range.
The recovery time of 300 µs represents the period after an ionizing event during which the tube is insensitive to subsequent radiation, which is a critical parameter for calculating dead-time corrections in high-count-rate environments.
The 1B67 is rated for operation under specific environmental conditions to ensure stability and prevent damage to the delicate window and gas fill:
The self-quenching gas mixture inside the tube allows it to terminate the ionization discharge internally without requiring external quenching circuitry, simplifying the associated electronic design.
The 1B67 is a self-quenching beta-gamma Geiger-Müller counter tube designed by The Victoreen Instrument Company. Operating at a nominal voltage of 1200 V d.c., it features a threshold voltage of 1100 V d.c. maximum, a minimum plateau length of 200 V, and a maximum plateau slope of 5.0% per 100 V. Mechanically, the tube is characterized by a 1-1/8 inch thin window (thickness of 2.0 to 2.6 mg/cm²), a top anode pin, and a cathode flange with two #8-32 holes on a 1-13/16 inch bolt circle. It provides a beta detection efficiency of 99.8%, a nominal background of 45 counts/min, and a recovery time of 300 µs, operating safely within an ambient temperature range of 0 to 100 °C.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 0
No fixed ratings are recorded for this section.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
GeigerThresholdVoltage
1100 V
Max
Operating Voltage
1200 V
Nominal
PlateauLength
200 V
Minimum
RelativePlateauSlope
5 %/100V
Maximum
Background
205 counts/min
Max
ElectrodeCapacitance
2.5 pF