Ludlum Model 733

PC-based gamma MCA system

USB-powered gamma spectroscopy system with a NaI(Tl) detector, MCA and SAAS software. Computer not included.

Part number: 48-38351
NaI(Tl) crystal (Ø × L): 7.6 × 7.6 cm1
Spectrum channels: 10241
ADC: 10-bit Wilkinson1

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 Research & laboratories Environmental monitoring & radiation protection

Key features

NaI(Tl) detector and USB cable included.
Spectrum analysis, ROIs and energy calibration in SAAS.
Basic software identifies energy peaks, not isotopes.

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.

Electronics & signal

Spectrum channels	10241
ADC	10-bit Wilkinson1
ADC clock	48 MHz1
ADC conversion at full scale	20 µs1
Internal detector high voltage	0–1200 V DC; 0.5 mA; ripple <30 mV1
Pulse shaping	1 µs, semi-Gaussian, internal pole-zero adjustment1

Connectivity & interface

Communication	USB; ANSI N42 export1

Power & battery

USB power	Approximately 4.75 V at 450 mA1

Mechanical

NaI(Tl) crystal (Ø × L)	7.6 × 7.6 cm1
USB cable length	5 m1
Dimensions	Detector: 8.3 × 24.1 cm (D × L); overall with MCA: 8.3 × 34.9 cm (D × L)2
Weight	1.8 kg2

Ordering & accessories

Part number	48-38351
Included software	SAAS1

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

Documents

PDFModel 732 & 733 PC-Based Gamma MCA SystemDatasheet · 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 732 & 733 PC-Based Gamma MCA System
Publisher: Ludlum MeasurementsDatasheet p. 1 (part numbers) and p. 2 detector specifications; p. 2, Detector Specifications; p. 2, MCA Specifications; p. 2, ADC Specifications … Checked 2026-10-16
2
Ludlum Model 733
Publisher: Ludlum MeasurementsProduct page Product page – Specifications, Detector; Specifications – Weight Checked 2026-10-16