Icx Technologies Gmbh

Icx Radiation Gmbh

Target Systemelectronic Gmbh

Juergen Stein

Guntram Pausch

Karen Saucke

The invention relates to a neutron detector for detection of neutrons in fields with significant &#x3b3;- or &#x3b2;-radiation, comprising a neutron sensitive scintillator crystal, providing a neutron capture signal being larger than the capture signal of 3 MeV &#x3b3;-radiation, a semiconductor based photo detector being optically coupled to the scintillator crystal, where the scintillator crystal and the semiconductor based photo detector are selected so that the total charge collection time for scintillator signals in the semiconductor based photo detector is larger than the total charge collection time for signals generated by direct detection of ionizing radiation in the semiconductor based photo detector, the neutron detector further comprising a device for sampling the detector signals, a digital signal processing device, means which distinguish direct signals from the semiconductor based photo detector, caused by &#x3b3;- or &#x3b2;-radiation and being at least partially absorbed in the semiconductor based photo detector, from light signals entering the semiconductor based photo detector, after being emitted from the scintillator crystal after capturing at least one neutron, by means of pulse shape discrimination, utilizing a difference between the total charge collection time for scintillator signals from the total charge collection time for signals generated by direct detection of ionizing radiation in the semiconductor based photo detector, and means which distinguish neutron induced signals from &#x3b3;-radiation induced signals in the scintillator crystal by discriminating the different signals via their pulse height, making use of the difference between the number of photons generated by neutron and &#x3b3;-radiation in the field of interest.

Solid state neutron detector

Method for correction of the temperature dependency of a light quantity L emitted by a light emitting diode (LED), being operated in pulsed mode with substantially constant pulse duration t, and measured in a light detector, using a predetermined parameter X, correlated to the temperature T of the LED in a predetermined ratio, whereby a correction factor K is determined from the parameter X, preferably using a calibration table, especially preferred using an analytic predetermined function, whereby the measured emitted light quantity L is corrected for the temperature contingent fluctuations of the emitted light quantity, whereby the parameter X is determined from at least two output signals of the LED, which are related to each other in a predetermined manner.

Method for stabilizing the temperature dependency of light emission of an LED

A detector for the measurement of radiation, preferably ionizing radiation, includes a medium, means for the conversion of the radiation energy absorbed by the medium into electrical charge, means for digital sampling of the charge signals, means for the determination of a calibration factor K, and means for the stabilization of the output signals of the detector. The medium at least partly absorbs the radiation to be measured. The electric charge is at least partially proportional to the energy of the radiation. The sampling is done preferably with a sampling rate between 1 and 1000 MHz. Further signal processing is digital. The calibration factor K has a fixed relation with respect to the decay time &#x3c4; of the medium. The output signals of the detector are mainly proportional to the radiation energy, and are stabilized with the help of the calibration factor K.

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Wuppertal, Germany

Juergen Stein