Ludlum 9DP-1*

Handheld survey meter

Ludlum 9DP-1* – handheld survey meter from Ludlum Measurements. Weight as specified: 1.5 kg, including batteries. Detector type: Pressurized ionization chamber.

Weight as specified: 1.5 kg, including batteries1
Detector type: Pressurized ionization chamber1

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

Chamber volume and pressure	220 cc volume pressurized to 2.5 atm (22 psig)1
Detector type	Pressurized ionization chamber1

Performance

Accuracy	± 10%1

Measuring range

Response time	Ranges from 7 seconds in lowest range to under 2 seconds in highest range when measuring from 10% to 90% of final value1
Energy response	Ambient dose equivalent or dose rate, flat within 30% from 60 keV to 1.3 MeV1
Measurement range	Auto-ranging – Sv/h: 2–50 µSv/h, 2–500 µSv/h, 0–5 mSv/h, 0–50 mSv/h, 0–500 mSv/h; R/h: 0.2–5 mR/h, 0.2–50 mR/h, 0–500 mR/h, 0–5 R/h, 0–50 R/h1

Power & battery

Power supply	Eight rechargeable "AA" NiMH batteries, supplied with wall charger for direct connection to instrument1
Battery life and conditions	Approximately 12 to 30 hours between charges depending on backlighting and USB usage1

Mechanical

Dimensions (H × W × L)	21.9 x 11.6 x 24.5 cm1
Weight as specified	1.5 kg, including batteries1

Environment & ratings

Operating temperature	-20 to 40 °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

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 9DP-1* – Ambient Dose Ion Chamber
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Chamber Volume'; Specifications tab, 'Accuracy'; Specifications tab, 'Power'; Specifications tab, 'Battery Life' … Checked 2026-10-16