The Ludlum Model Neutron Detector is designed for detection of thermal and fast neutrons (0.025 eV to approximately 12 MeV). The neutrons are detected, not directly, but through nuclear reactions, which result in energetic charged particles such as protons and tritons.
| Indicated Use | Neutron detection, area monitoring |
| Description | Wall mount proportional neutron detector |
| Moderator | 25.4 cm (10.0 in.) diameter polyethylene sphere |
| Detection Range | Thermal to approximately 12 MeV |
| Energy Response | Approximately follows the radiation protection guide curve for neutron dose |
| Sensitivity | Typically 20,000 cpm/mSv/h (200 cpm per mrem/hr) (AmBe) |
| Gamma Rejection | 10 cpm or less through 0.1 Sv/h (10 R/hr) |
| Operating Voltage | Typically 1200 V THRESHOLD |
| Temperature Range | -15 °C to 50 °C (5 °F to 122 °F) |
| Construction | Polyethylene moderator with aluminum housing and mounting bracket |
| Size | 38.1 x 25.4 x 26.2 cm (15.0 x 10.0 x 10.3 in.) (H x W x L), including bracket |
| Weight | 8.8 kg (19.5 lb) |
