Ludlum 26S

Handheld contamination meter

Ludlum 26S – handheld contamination meter from Ludlum Measurements. Detector: CsI(Tl) scintillator. Energy range: From 40 keV to 3 MeV.

Detector: CsI(Tl) scintillator1
Energy range: From 40 keV to 3 MeV1
Weight as specified: 0.35 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

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	CsI(Tl) scintillator1

Measuring range

Energy range	From 40 keV to 3 MeV1
Gamma sensitivity	165 kcpm per mR/hr (137Cs)1
Response time	User-selectable from 1 to 60 seconds, or auto-response rate FAST or SLOW1

Power & battery

Power supply	Two alkaline "AA" batteries1
Battery life and conditions	Approximately 200 hours of operation1

Mechanical

Dimensions (H × W × L)	4.6 x 6.9 x 27.2 cm1
Weight as specified	0.35 kg1

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 26S – Integrated Scintillator Frisker
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector'; Specifications tab, 'Energy Range'; Specifications tab, 'Gamma Sensitivity'; Specifications tab, 'Power' … Checked 2026-10-16