Model 2363 with 42-41L

Neutron Dose Survey Meter

Part Number: 48-3514

Features

Light-weight Neutron Detection System
Independent Gamma and Neutron Measurements
Neutron Detection Range: 0.1 mrem/hr to 1 rem/hr
Gamma Detection Range: 0.1 mR/hr to 1 R/hr
Scaler & Data Logging Capabilities

This gamma/neutron survey meter combines Ludlum Model 2363 survey meter with the Model 42-41L PRESCILA neutron detector. The gamma detector is an energy compensated GM housed internally to the survey meter. The neutron detector is a proton recoil type, which provides excellent measurement results at less weight than the more traditional REM balls. The neutron measurement has excellent gamma rejection up to 100 mR/hr.

Specifications

Indicated Use	Gamma and neutron survey
Detection Range	Model 42-41L PRESCILA Neutron Detector (External): 0.1 mrem/hr to 1 rem/h Energy-Compensated Gamma GM Detector (Internal): 0.1 mR/hr to 1 R/hr
Sensitivity	Neutron (with Model 42-41L): 350 cpm per mrem/hr, gamma rejection up to 100 mR/hr Gamma (Internal Detector): 1000 cpm per mR/hr
Neutron Energy Response	Thermal to 100 MeV
Linearity	Reading within 10% of true value with detector connected
Gamma Rejection (¹³⁷Cs)	Approximately 400 cpm at 100 mR/hr
Meter Dial	0 - 10 mrem/hr, BAT OK
Meter	6.4 cm (2.5 in.) arc, 1 mA analog type
Digital Display	6-digit LCD with 0.64 cm (0.25 in.) digits
Multipliers	x0.1, x1, x10, x100
Selector Switch	Toggle switch to select gamma + neutron, gamma only, or neutron only
Reset/Read ID	A two-position momentary action switch that may be moved to select RESET the meter, or toward the READ ID position to read the integrated dose on the digital display
Logging Pushbutton	Located in the handle, used to store a reading
Data Logger	Capable of logging up to 1000 individual data points with the following identifiers for each point: Gamma and neutron sample counts Sample number Date/Time stamp Current integrated dose 10-character location identifier (All data is stored in non-volatile memory, allowing batteries to be removed without loss of data.)
Adjustable Alarms	Gamma alarm Neutron alarm Integrated dose alarm (Indicated by red front panel LEDs)
Response	Will vary according to the number of counts present, typically 2 to 11 s from 10% to 90% of final reading
Audio	Built-in unimorph speaker with volume control (greater than 60 dB at 61 cm [2 ft], full volume)
Audio Divide	Selectable dual or individual click-per-event for gamma and neutron counts
Power	2 each “D” cell batteries (housed in sealed compartment that is accessible from front of instrument)
Battery Life	Greater than 200 hours (battery condition can be checked on meter)
Data Output	9-pin RS-232 port for connection to PC for data download and adjustment of setup parameters. A one meter RS-232 to USB adapter cable is included. PC interface software is available for download here.
Connector	Series “C” (others available on request)
Overall Size (H x W x L)	Without PRESCILA: 19.6 x 8.9 x 21.1 cm (7.7 x 3.5 x 8.3 in.), including connector protrusion With PRESCILA: 32.3 x 13.7 x 34.3 cm (12.7 x 5.4 x 13.5 in.), including connector protrusion
Weight	Without PRESCILA: 2.0 kg (4.5 lb), including batteries With PRESCILA: 4.2 kg (9.2 lb), including batteries

Options

Option	Description	Part Number
Overload Indicator Option	Adds Overload indicator (does not include light).	4464-153
Headphone Jack	Adds headphone jack to instrument.	4464-464
Stereo/Mono Headphones	Adjustable stereo/mono headphones.	22-9313