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​Ludlum Neutron Radiation Detectors


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Model 42-31H
Ludlum Part Number: 47-3583
Neutron Radiation Survey
H-3 Proportional Radiation Detector
Used with Ludlum Radiation Meters Capable of Achieving -2 mV Sensitivity
Sensitivity: typically 100 cpm/mrem/hr (Am-241 Fast Neutrons)
Detection Range: Thermal to 12 MeV
Energy Response: Thermal to 12 MeV
​​Moderator: 9.0 in. Diameter Cadmium-Loaded Polyethylene Sphere
Gamma Rejection: 10 cpm or less through 10 R/hr (Cs-137)
Data Sheet
Product Manual
Model 42-31 Removal of BF-3 Tube

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Model 42-41L PRESCILA
Ludlum Part Number: 47-3309
Neutron Radiation Survey
PRESCILA Proton Recoil Scintillation Detector
Used with Ludlum Models 2363, 12, 2221, 2241-Series, 3IS, 2350-1
Sensitivity: approximately 350 cpm/mrem/hr (AmBe-241)
Energy Response: Thermal to 100 MeV
Gamma Rejection: approximately 400 cpm at 100 mR/hr (Cs-137)
Model 42-41L PRESCILA Drawing
Energy Response
Data Sheet
Product Manual

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Model 42-30H
Ludlum Part Number: 47-3582
Neutron Radiation Survey
Wall Mount H-3 Proportional Detector
For Ludlum Models 375, 177-50, 177-61​
Gamma Rejection: 10 cpm or less through 10 R/hr (Cs-137)
Moderator: 10.0 in. Dia. Polyethylene Sphere
Energy Response: Thermal to 12 MeV
Detection Range: Thermal to 12 MeV
Sensitivity: 200 cpm/mrem/hr (AmBe-241)
Data Sheet
Product Manual

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Model 42-5
Ludlum Part Number: 47-1505
Neutron Fluences and Dose Determination
4 x 4 mm Li-6I(Eu) Scintillation Detector
Used with Ludlum General Purpose Radiation Survey Meters, Ratemeters, Scalers
Sensitivity: typically 45 cpm/mrem/hr (AmBe-241) with 10 in. Moderator
​Energy Range: Thermal to 12 MeV
​Moderators: Provided with 2 in.; 3 in.; 5 in.; 8 in.; 10 in.; 12 in. Dia. High-Density Polyethylene Spheres (others available)
Gamma Rejection: 10 cpm or less through 100 mR/hr (Cs-137)
Data Sheet
Product Manual


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Radiation Safety & Protection, LLC
6555 Sugarloaf Parkway  Suite 307-333  Duluth, GA 30097
Phone: (770) 363-0925  Email:  sales@radsafetypro.com

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