Gas proportional scintillation counter for ionizing...

G - Physics – 01 – T

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G01T 1/205 (2006.01) H01J 47/06 (2006.01)

Patent

CA 2117325

The present invention concerns detectors for ionizing radiation (X-rays, gamma rays, electrons, protons, alpha particles, etc. as well as neutrons) of the gas proportional scintillation counter type. The preferred embodiment for X-ray detection consists in a detector, filled with very pure xenon at atmospheric pressure, with a 2.5 cm diameter radiation window (1), a grid with a spherical (2 cm radius) curvature (2) with its edges placed 0.8 cm away from a plane grid which is placed in contact with or close to a photomultiplier tube (4). This photomultiplier has uniform sensitivity in the 170 nm wavelength region. This detector presents an energy resolution of 8.0 % for 5.9 keV X-rays.

L'invention concerne des détecteurs de rayonnements ionisants (rayons X et gamma, électrons, protons, particules alpha, etc., ainsis que neutrons) du type compteur de scintillations proportionnel à gaz. Pour la détection de rayons X, la variante préférée consiste en un détecteur, rempli de xénon très pur à la pression atmosphérique, doté d'une fenêtre de rayonnement de 2,5 cm de diamètre (1) et d'une grille à rayon de courbure sphérique de 2 cm (2) dont les bords sont placés à 0,8 com d'une grille plane qui est disposée au contact ou près d'un photomultiplicateur (4). Ce dernier présente une sensibilité uniforme dans la zone de longueur d'onde des 170 nm. Ce détecteur présente une résolution énergétique de 8,0 % pour des rayons X de 5,9 keV.

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