Ludlum 3004i/4

Portable neutron meter

Ludlum 3004i/4 – portable neutron meter from Ludlum Measurements. Detector: ³He proportional detector. Measurement range: 0-100 mSv/h (0-10,000 mrem/hr).

Detector: ³He proportional detector1
Measurement range: 0-100 mSv/h (0-10,000 mrem/hr)1
Weight as specified: 8.3 kg, with batteries1

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

Key features

Detector: ³He proportional detector
Measurement range: 0-100 mSv/h (0-10,000 mrem/hr)
Sensitivity and reference: Typically 10 cpm per μSv/h (100 cpm per mrem/hr) [bare AmBe neutrons]

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	³He proportional detector1
Internal detector	Energy compensated GM1

Performance

Linearity	±10 %1

Measuring range

Measurement range	0-100 mSv/h (0-10,000 mrem/hr)1
Sensitivity and reference	Typically 10 cpm per μSv/h (100 cpm per mrem/hr) [bare AmBe neutrons]1
Response time	User-selectable from 1 to 60 seconds, auto SLOW, auto FAST, fixed SLOW (22 s), fixed FAST (4 s)1
Internal detector range	10 µSv/h to 500 mSv/h (1 mR/hr to 50 R/hr)1

Electronics & signal

Detector bias	Adjustable from 300 to 2400 Vdc1

Power & battery

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

Mechanical

Dimensions (H × W × L)	41.1 x 23.1 x 25.1 cm1
Weight as specified	8.3 kg, with batteries1

Environment & ratings

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

Ordering & accessories

Part number	48-4442-41

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 3004 Series – Neutron Dose Survey Meter with Optional Internal Gamma Detector
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector'; Specifications tab, 'Measurement Range'; Specifications tab, 'Sensitivity'; Specifications tab, 'High Voltage' … Checked 2026-10-16