Ludlum 15

Portable neutron meter

Ludlum 15 – portable neutron meter from Ludlum Measurements. Instrument count-rate range: 0 to 500,000 cpm. Weight as specified: 3.7 kg.

Instrument count-rate range: 0 to 500,000 cpm1
Weight as specified: 3.7 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 Defence, security & preparedness Research & laboratories

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.

Performance

Linearity	±10 % of true value1

Measuring range

Instrument count-rate range	0 to 500,000 cpm1
Neutron sensitivity (bare ²⁴¹AmBe)	55 cpm per mrem/hr (Model 42-14H neutron detector)1
Sensitivity (¹³⁷Cs gamma)	Typically 2,100 cpm per mR/hr (Model 44-7 GM detector)1

Connectivity & interface

Detector connector	Series "C" (others available)2

Power & battery

Power supply	2 "D" cell batteries1
Battery life and conditions	Approximately 600 hours with alkaline batteries, can be checked on meter1

Mechanical

Dimensions (H × W × L)	31.8 x 8.9 x 21.6 cm1
Weight as specified	3.7 kg1

Environment & ratings

Operating temperature	-20 to 50 °C1

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 15 Neutron Count Ratemeter (data sheet)Datasheet · 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 15 Neutron Dose Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Instrument Range'; Specifications tab, 'Linearity'; Specifications tab, 'Power'; Specifications tab, 'Battery Life' … Checked 2026-10-16
2
Model 15 Neutron Count Ratemeter (data sheet)
Publisher: Ludlum MeasurementsDatasheet Specifications, 'Connector' Checked 2026-10-16