Model 2363 Gamma/Neutron Meter

with the 42-41L PRESCILA Detector

2363 survey meter 42-41L Neutron probe 2363 survey meter, display and controls

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.

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:

(All data is stored in non-volatile memory, allowing batteries to be removed without loss of data.)
Adjustable Alarms

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

Ludlum Model 2363 manual

Manual