Ludlum 3014 with Model 42-41L

Portable neutron meter

Ludlum 3014 with Model 42-41L – portable neutron meter from Ludlum Measurements. Enclosure rating and conditions: IP53.

Measurement range: Neutron: 1 µSv/h to 10 mSv/h (0.1 mrem/hr to 1 rem/hr); gamma: 1 µSv/h to 50 mSv/h (0.1 mR/hr to 5 R/hr)1
Enclosure rating and conditions: IP531
Weight as specified: With Model 42-41L: 3.5 kg; without Model 42-41L: 1.4 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.

Detector

Internal detector	Energy-compensated GM detector; sensitivity (¹³⁷Cs): 100 cpm per µSv/h (1000 cpm per mR/hr)1

Performance

Linearity	±10 %1

Measuring range

Measurement range	Neutron: 1 µSv/h to 10 mSv/h (0.1 mrem/hr to 1 rem/hr); gamma: 1 µSv/h to 50 mSv/h (0.1 mR/hr to 5 R/hr)1
Response time	User-selectable from 1 to 60 seconds, auto SLOW, auto FAST, fixed SLOW (22 s), fixed FAST (4 s)1
Neutron sensitivity	35 cpm per µSv/h (350 cpm per mrem/h) for ²⁴¹AmBe; external Model 42-41L PRESCILA detector1

Electronics & signal

Detector bias	Neutron: typically 500 to 700 Vdc; gamma: 550 Vdc1

Power & battery

Power supply	Four "AA" batteries1
Battery life and conditions	Approximately 175 hours of operation1

Mechanical

Weight as specified	With Model 42-41L: 3.5 kg; without Model 42-41L: 1.4 kg1
Overall dimensions (H × W × L)	31.1 × 12.5 × 33.2 cm1

Environment & ratings

Operating temperature	-20 to 50 °C1
Enclosure rating and conditions	IP531

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

Documents

PDFDatablad (PDF)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 3014 with Model 42-41L – Neutron Dose Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Internal Detector'; Specifications tab, 'Measurement Range'; Specifications tab, 'High Voltage'; Specifications tab, 'Linearity' … Checked 2026-10-16