Commissariat a L'energie Atomique

Jean-Paul Bonnefoy-Claudet

Corinne Mestais

Edmond Tournier

Michel Martin

Francedillacoise Mathy

The invention relates to a method and device for using a signal, or a set of data representative of the time variation of a signal output by a semiconductor detector (52), in response to the interaction of a .gamma. photon with the semiconductor material in which a signal or data is produced, being representative of the rise time of the electronic component of the signal output by the detector. The total detected charge may also be measured. Charge-rise time correlation curves are created.

Method and device for correction of spectrometric measurements in the

To take account of the decrease time constant of the intensity of the light scintillation and the statistical fluctuation of the scintillation, which is a resolution deterioration factor, it is appropriate to integrate the electric pulse resulting from the detection of an event by photomultiplier tubes. If, during this integration, a stacking phenomenon occurs, a second pulse is superimposed on the first and falsifies the calculation of the scintillation coordinates. This stacking is eliminated by validating the calculation of these coordinates by checking the value reached by the scintillation energy at the end of said integration. The value of this energy is measured by integrating the signal representing the intensity of the light scintillation.

Process and device for taking into account locating pulses supplied by a

In the synchronous detection signals of frequency Fo immersed in a noise, an auxiliary signal is produced having a period 1/2 Fo and in the form of a rectified symmetrical wave, by rectifying a symmetrical wave of period 1/Fo. The signal to be filtered is multiplied by the auxiliary signal and synchronous filtering or synchronous detection on the frequency Fo is performed on the signal obtained after the above-mentioned multiplication. Preferably the auxiliary signal is produced in the form of a rectified sinusoidal wave and a square wave reference signal from which the above-mentioned symmetrical wave is derived, having the period 1/Fo, is also used to control the synchronous detection or the synchronous filtering.

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Grenoble, France

Jean-Paul Bonnefoy-Claudet