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Model 240 Series
User’s Manual
Section 1
Ludlum Measurements, Inc. Page 1-1 October 2020
Introduction
he Model 240 Alpha-Beta Floor and Wall Monitor allows a user
to quickly survey large areas for alpha-beta contamination.
Compatible with either gas-proportional or scintillation detectors, the
Model 240 cart comes in a version that supports both floor and wall
monitoring or a floor-style only version.
Detector-to-surface spacing is adjustable and detectors are positioned for
no “dead” zones when scanning.
Gas proportional models come with a gas regulator, flowmeters, and gas
lines, but the P-10 gas bottle is not included. The cart also provides two
holders for spare detectors, to provide for replacement if a detector
becomes damaged.
T
Section
1
The left photo shows the gas
proportional version (without
cables) of the Model 240 (part #
48-3956) in the wall monitoring
position. Above is the Model 240S
(part # 48-413)1, which is the
scintillation version of this
instrument, shown in the floor
monitoring position.