Ludlum 19

Handheld survey meter

Ludlum 19 – handheld survey meter from Ludlum Measurements. Weight as specified: 2.04 kg including batteries.

Detector (D × L): NaI(Tl) scintillator, 2.5 × 2.5 cm (1 × 1 in.), internally mounted1
Weight as specified: 2.04 kg including 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 Emergency services & first response Environmental monitoring & radiation protection Industry & quality control

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 (D × L)	NaI(Tl) scintillator, 2.5 × 2.5 cm (1 × 1 in.), internally mounted1

Performance

Linearity	Reading ±10 % of true value1

Measuring range

Sensitivity (¹³⁷Cs gamma)	Approximately 175 cpm per μR/hr1
Measurement range	0 to 5000 µR/hr1
Energy response	Energy dependent (energy response curve available from the manufacturer)1

Power & battery

Power supply	2 "D" cell batteries1
Battery life and conditions	Typically 2000 hours with alkaline batteries1

Mechanical

Dimensions (H × W × L)	15.2 x 8.9 x 21.6 cm without handle1
Weight as specified	2.04 kg including batteries1

Environment & ratings

Operating temperature	-20 to 50 °C1

General

Meter dial	0–25 µR/hr, 0–50 µR/hr, BAT TEST, high-voltage test1

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 19 microR Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector (D x L)'; Specifications tab, 'Sensitivity (137Cs gamma)'; Specifications tab, 'Linearity'; Specifications tab, 'Power' … Checked 2026-10-16