Thermal Neutron Sensor

Thermal Neutron Probe


Thin Film Deposition



Cambridge Microfab Ltd
Broadway, Bourn
Cambridge CB23 2TA

T: +44 (0) 1954 718100
F: +44 (0) 1954 718164

Solid State Thermal Neutron Sensor

    A rugged heterodiode sensor for detecting incident thermal neutrons. We believe our sensors are the most efficient solid state neutron sensors commercially available today. The sensor stops about 1 in 7 thermal neutrons and produces useable signals from over 1 in 2 stops, giving an overall efficiency of 7.5%. The measured neutron count rate depends on the incident neutron flux, the sensor area, the sensor configuration and the lower limit of discrimination used in the signal chain. A standard sensor behaves much like a very thin 50mm2 3He tube filled with 0.509 cc of 3He but without the high voltages, so these sensors are intrinsically safe. Originally developed for planetary space studies in support of the European Space Agency's Science & Robotic Exploration programme, the sensor has been designed to meet requirements for low applied voltage, high efficiency & ease of operation in a compact, robust package.
Neutron Sensors
  • suitable for medical, space, military, nuclear, laboratory, educational & environmental applications
  • easily configured as a pixellated structure for applications requiring spatial discrimination
  • ideal for hand held or field use
  • compact, lightweight & robust
  • low voltage makes operation intrinsically safe
  • low power consumption so very suitable for battery operation
  • single pulse per effective neutron output at low flux levels
  • useful output over many decades of neutron flux intensity
  • high thermal neutron specificity
  • insensitive to gamma radiation
  • uniform response (no edge or wall effects)
  • semi transparent to neutrons so low perturbation of neutron field
  • highly asymmetric (quasi-2D) detector element (length & width are ~1000 x thickness)
  • wide operating temperature range
  • AT-25 & AT-50 silicon sensors for use up to 55oC
  • HT-50 silicon carbide sensors for use up to 175oC
AT-25 Thermal Neutron Sensor
AT-50 Thermal Neutron Sensor
HT-50 Thermal Neutron Sensor