Neutron Meters

Ludlum Neutron Meters Comparison Table

Model 30-7 Series

Lightweight Digital Neutron Survey Meter

Digital Meter
³He Proportional Detector
Moderator: 19.5 cm (7.7 in.) dia.
Sensitivity (²⁴¹AmBe): 4.5 cpm per µSv/h (45 cpm per mrem/hr) or 10 cpm per µSv/h (100 cpm per mrem/hr)
Range: 0 to 99.9 mSv/h (0 to 9.99 rem/hr)

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Model 3007 Series

Neutron Dose Survey Meter With Optional Internal Gamma Detector

Digital Meter
³He Proportional Detector
Moderator: 19.5 cm (7.7 in.) dia.
Sensitivity (²⁴¹AmBe): 4.5 cpm per µSv/h (45 cpm per mrem/hr) or 10 cpm per µSv/h (100 cpm per mrem/hr)
Range: 0 to 100 mSv/h (0 to 10,000 rem/hr)
Internal Detector Option for Exposure/Dose Measurements

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Model 12-4-7

Neutron Dose Survey Meter

4-Range Analog Meter
Moderator: 19.5 cm (7.7 in.) dia.
Sensitivity (²⁴¹AmBe): 10 cpm per µSv/h (100 cpm per mrem/hr)
Range: 0 to 100 mSv/h (0 to 10,000 mrem/hr)

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Model 30-4

Digital Neutron Survey Meter

Digital Meter
3He Proportional Detector
Moderator: 22.9 cm (9.0 in.) dia.
Sensitivity (241AmBe): 10 cpm per µSv/h (100 cpm per mrem/hr)
Range: 0 to 99.9 mSv/h (0 to 9.99 rem/hr)

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Model 12-4

Neutron Dose Survey Meter

4-Range Analog Meter
Model 42-31H 3He Proportional Detector
Moderator: 22.9 cm (9.0 in.) dia.
Sensitivity (241AmBe): 10,000 cpm per mSv/h (100 cpm per mrem/hr)
Range: 0 to 100 mSv/h (0 to 10,000 mrem/hr)

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Model 2241-4

Neutron Dose Survey Meter

Digital Scaler-Ratemeter
Model 42-31H 3He Proportional Detector
Moderator: 22.9 cm (9.0 in.) dia.
Sensitivity (241AmBe): 30 cpm per mrem/hr
Range: 0 to 100 mSv/h (0 to 10,000 mrem/hr)

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Model 375-31H

Area Monitor with Neutron Detector

Digital Area Monitor
³He Proportional Detector
Moderator: 22.9 cm (9.0 in.) dia.
Sensitivity: 10,000 cpm per mSv/h (100 cpm per mrem/jr)
Range: 0 to 100 mSv/h (0 to 10 rem/hr)

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Model 2363 with 42-41L

Neutron Dose Survey Meter

Neutron and Gamma Detection
Analog + Digital Scaler-Ratemeter
External Model 42-41L PRESCILA Detector
- Neutron Sensitivity: 350 cpm per mrem/hr
- Range: 0.1 mrem/hr to 1 rem/hr
Internal GM Detector
- Gamma Sensitivity: 1000 cpm per mR/hr
- Range: 1 µSv/h to 10 m Sv/h (0.1 mR/hr to 1 R/hr)

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Model 15

Neutron Dose Survey Meter

Neutron and Alpha-Beta-Gamma Detection
4-Range Analog Meter
Model 42-14H ³He Proportional Detector
- Sensitivity (²⁴¹AmBe): 55 cpm per mrem/hr
Model 44-7 End-Window GM Detector
- Sensitivity (137Cs): 2100 cpm per mR/hr
Range: 0 to 500,000 cpm

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