1B85

Widely used rugged self-quenching Geiger-Müller counter for beta and gamma radiation. Its durable construction and general-purpose sensitivity suit survey, monitoring, and laboratory radiation-measurement equipment.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: A182
Base pins: -
Nominal heater: -

Description

Widely used self-quenching beta/gamma counter tube with high performance and rugged construction.

Socket description

RETMA/RMA A1-82 two-contact coaxial radiation-counter tube base family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: A182
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 0

GeigerMullerCounter

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1950 Victoreen

Published operating points and test conditions from this source.

SECTION 0

GeigerMullerCounter

Other

ThresholdVoltage
800 V
Max
Operating Voltage
850 to 950 V

Characteristic

PlateauLength
200 V
Minimum
PlateauSlope
5 %/100V
Maximum
RecoveryTime
100 us
Background
40 counts/min
BetaEnergyMinimum
160 keV

Capacitance

ElectrodeCapacitance
2 pF