Apparatus and method for calibration of nuclear gauges

Details Apparatus and method for calibration of nuclear gauges Apparatus and method for calibration of nuclear gauges

G - Physics

01

T

G01T 1/00 (2006.01) G01N 23/00 (2006.01)

Patent

CA 2361099

The present invention is directed to a method and apparatus for calibrating nuclear gauges and confirming gauge calibrations that provide the accuracy of multiple block calibration methods without requiring multiple standardized calibration blocks of known density. The apparatus includes a support for receiving a nuclear gauge of the type having a radiation source and a radiation detector and a variable radiation filter operatively associated with the support for providing variable attenuation of radiation emitted from the radiation source. The variable radiation filter includes a block having an eccentrically located cavity and positioned for rotation about the central axis of the cavity. The filter may further include a fixed mass for further attenuating radiation discharge by the radiation source such that the energy spectrum produced by the filter substantially matches the energy spectrum of a solid block of material, such as a standardized calibration block.

La présente invention concerne un procédé et un appareil destinés à étalonner des jauges nucléaires et à confirmer des étalonnages de jauges, qui permettent d'obtenir la précision des procédés d'étalonnage à blocs multiples sans devoir recourir à l'utilisation de blocs d'étalonnages standardisés multiples de densité connue. L'appareil comprend un support destiné à recevoir une jauge nucléaire du type à source de rayonnement, un détecteur de rayonnement et un filtre à rayonnement variable associé au support, de manière opératoire, afin de permettre un atténuation variable du rayonnement émis par la source. Le filtre à rayonnement variable comprend un bloc présentant une cavité excentrée et positionnée de manière à pouvoir tourner autour de l'axe central de la cavité. Le filtre peut, en outre, comprendre une masse fixe permettant une atténuation supplémentaire du rayonnement de la source telle que le spectre énergétique sortant du filtre corresponde sensiblement au spectre énergétique d'un bloc solide de matériau, tel qu'un bloc d'étalonnage standardisé.

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