18505

Self-quenching Philips mica-window Geiger-Müller counter for alpha, beta, and gamma measurement. Its thin window and halogen-quenched gas fill support broad radiation sensitivity with a long operating life.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Self-quenching mica-window Geiger-Muller radiation counter for alpha, beta, and gamma measurement.

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

Max plate voltage: 450 V

Published ratings and characteristics promoted semantically from the approved Philips source.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

GeigerMullerCounter

Characteristic

Starting / Threshold Voltage Minimum
300 V
Starting Voltage Maximum
350 V
Plateau Length
250 V
Beginning of Plateau Maximum
450 V
Plateau Slope Maximum
0.02 %/V
At published counting condition
Dead Time Maximum
125 us
Background Count Maximum
25 counts/min
Published shielding condition
Count Life Expectancy Minimum
50000000000 counts

Other

Maximum Ambient Temperature
75 C

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

GeigerMullerCounter

Construction

Filling
Neon, argon and halogen quenching agent
Mica window effective diameter
19.8 mm
Mica window area
3 cm2
Mica window thickness
1.5-2 mg/cm2

Capacitance

Interelectrode capacitance
2 pF

Characteristics

Starting voltage minimum
300 V
Starting voltage maximum
350 V
Plateau length minimum
250 V
Plateau slope maximum
0.02 %/V
Vp=450-700V
Shielded background maximum
15 counts/min
2inPb;1/8inAl
Expected count life minimum
50000000000 counts

Other

Operating voltage minimum
450 V