A scintillator can include a monocrystalline compound having a general formula Na.sub.(1-y)Li.sub.yX, where 0<y<1 and X is at least one halogen or any combination of halogens. In an embodiment, the scintillator can have a Pulse Shape Discrimination Figure of Merit of at least 1 at a temperature of 25° C., at a temperature of 150° C., or both.

An optoelectronic neutron detector and method for detecting nuclear material having a neutron capture and scatter medium receiving neutrons and producing secondary charged particles, a photodetector detecting emitted light from the secondary charged particles and outputting a detector signal, and a controller receiving the detector signal and providing an alert or quantitative indication of detected nuclear material in response to the detector signal.

An optoelectronic neutron detector and method for detecting nuclear material having a neutron capture and scatter medium receiving neutrons and producing secondary charged particles, a photodetector detecting emitted light from the secondary charged particles and outputting a detector signal, and a controller receiving the detector signal and providing an alert or quantitative indication of detected nuclear material in response to the detector signal.

The present disclosure relates to a time-gated fast neutron transmission radiography system and method. The system makes use of a pulsed neutron source for producing neutrons in a plurality of directions, with at least a subplurality of the neutrons being directed at an object to be imaged. The system also includes a neutron detector system configured to time-gate the detection of neutrons emitted from the pulsed neutron source to within a time-gated window.

The present disclosure relates to a time-gated fast neutron transmission radiography system and method. The system makes use of a pulsed neutron source for producing neutrons in a plurality of directions, with at least a subplurality of the neutrons being directed at an object to be imaged. The system also includes a neutron detector system configured to time-gate the detection of neutrons emitted from the pulsed neutron source to within a time-gated window.

A radiation monitor includes a radiation detection unit detecting radiation, and an optical fiber transmitting photons emitted from a light emitting element of the radiation detection unit, wherein the radiation detection unit includes a first light emitting element generating a photon in response to incident radiation, a chemical compound part having chemical compounds which generate charged particles by nuclear reactions with incident neutrons, and a second light emitting element being located between the first light emitting element and the chemical compound part and generating a photon in response to radiation.

A radiation monitor includes a radiation detection unit detecting radiation, and an optical fiber transmitting photons emitted from a light emitting element of the radiation detection unit, wherein the radiation detection unit includes a first light emitting element generating a photon in response to incident radiation, a chemical compound part having chemical compounds which generate charged particles by nuclear reactions with incident neutrons, and a second light emitting element being located between the first light emitting element and the chemical compound part and generating a photon in response to radiation.

A scintillator can include an elpasolite scintillator compound. The scintillator can be doped with a Group 2 element, and may also include an activator. The scintillator has an improved core valence luminescence at room temperature as compared to a corresponding elpasolite scintillator compound without the Group 2 dopant. The elpasolite scintillator compound can have significant core valance luminescence at a temperature higher than 125° C. In a particular embodiment, the elpasolite scintillator compound can include Cl and may or may not also include another halide, such as Br or I. The scintillator can be part of an apparatus that detects gamma radiation and neutrons and may allow a relatively simpler pulse discrimination technique to be used to a higher temperature, such as 125° C. to 150° C. before a relatively more complex pulse discrimination technique would be used.

A scintillator can include an elpasolite scintillator compound. The scintillator can be doped with a Group 2 element, and may also include an activator. The scintillator has an improved core valence luminescence at room temperature as compared to a corresponding elpasolite scintillator compound without the Group 2 dopant. The elpasolite scintillator compound can have significant core valance luminescence at a temperature higher than 125° C. In a particular embodiment, the elpasolite scintillator compound can include Cl and may or may not also include another halide, such as Br or I. The scintillator can be part of an apparatus that detects gamma radiation and neutrons and may allow a relatively simpler pulse discrimination technique to be used to a higher temperature, such as 125° C. to 150° C. before a relatively more complex pulse discrimination technique would be used.

An apparatus for neutron detection is provided. The apparatus comprises a sensor medium in electrical contact with an electrode arrangement conformed to collect radiation-generated charge from the sensor medium. The sensor medium comprises a borazine and/or a borazine-based polymer.