Neutron Survey Meters

Model 12-4

The Model 12-4 consists of a count rate meter with a removable detector.  The detector assembly consists of a 1.6cm by 2.5cm BF3 proportional tube, surrounded by 0.0038cm (0.0015") thick cadmium shield, within a 22.9cm (9") diameter polyethylene moderator.  This assembly provides an approximate inverse RPG response curve for neutrons ranging from thermal through 10MeV.  Efficiency for AmBe neutrons is approximately 30cpm/mrem/h.  Gamma sensitivity at Cesium-137 is less than 10cpm through 10R/h.

Model 15

The Model 15 is designed to detect alpha, beta, gamma and neutron radiation.  It consists of a count rate meter with a removable thin-end window alpha, beta gamma probe and a BF-3 neutron proportional tube detector with a 3" diameter cadmium-lined moderator.  The detector can be removed from the moderator for fast neutron response.

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