Model 44-9 Pancake GM-detektor

Contamination probe

A pancake GM detector for alpha, beta and gamma surveys and sample counting with compatible instruments.

Detector type: Halogen-quenched pancake GM1
Weight: 0.5 kg1

Download product sheet (PDF)All values with references – for tender documents

Specifications checked against the manufacturer’s documents on 2026-10-16

Manufacturer’s product page (opens in a new tab)

Overview

Nuclear power & nuclear technology Emergency services & first response Environmental monitoring & radiation protection Industry & quality control

Key features

Common detector type for checking people and objects.

Specifications

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

Detector

Detector type	Halogen-quenched pancake GM1
Measurement	Alpha, beta, gamma; sample counting1
Active detector area	15.5 cm²2
Open window area	12.3 cm²2
Window	Mica, 2.0 ± 0.3 mg/cm²1

Performance

Dead time, typical	80 µs1

Measuring range

Gamma sensitivity, typical (¹³⁷Cs)	3300 cpm per mR/hr1

Connectivity & interface

Detector connector	Series C; alternatives available1

Mechanical

Dimensions (H × W × L)	4.6 × 6.9 × 27.2 cm1
Weight	0.5 kg1

Environment & ratings

Operating voltage	900 V DC1
Operating temperature	−15 to +50 °C (5 to 122 °F); may be certified for −40 to +65 °C (−40 to 150 °F)3

The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.

Documents

PDFModel 44-9 Alpha, Beta, Gamma Radiation DetectorDatasheet · Ludlum

Sources

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

1
Model 44-9 Alpha, Beta, Gamma Radiation Detector
Publisher: Ludlum MeasurementsDatasheet p. 1, Specifications; p. 1, Specifications (SENSITIVITY) Checked 2026-10-16
2
Model 44-9 Alpha-Beta-Gamma Detector
Publisher: Ludlum MeasurementsProduct page Specifications tab (Window Area) Checked 2026-10-16
3
Ludlum Model 44-9 manual
Publisher: Ludlum MeasurementsManual Manual p. 8 (p. 2), Specifications Checked 2026-10-16