1B90

All-glass thin-wall self-quenching Geiger-Müller counter for beta and gamma radiation. Designed for battery-operated survey instruments, its lightweight construction suits portable radiation detection and field monitoring.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

DESCRIPTION The type IBSO is an all glass, thin-wall, selif-quenching counter tube for detecting beta and gamma radiation. It is designed for use in battery operated survey instruments and Prospector's Units for locating radioactive material.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
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 1

GeigerMullerCounter

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Values promoted from published ratings/characteristics where identifiable.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

GeigerMullerCounter

Other

Testing Voltage, max.** Threshold ¢
150 volts
Testing Voltage, max.** Threshold ¢ 150 volts,dc
Counting Rate, max
12000 CPM
Counting Rate, max. 12000 CPM
Temperature Range
55 Cent
Temperature Range -40°to +55° Cent.
Geiger Threshotd, max
1100 volts
Geiger Threshotd, max. 1100 volts,de
Relative Plateau Slope
100 volts
Relative Plateau Slope 3% vper 100 volts
Operating Voltage ** Threshold #
50 volts
Operating Voltage ** Threshold # 50 volts,dc
Background # (approx)
80 CPM
Background # (approx) 80 CPM
Life
108 Counts
Life 108 Counts = <« ;‘,