A method for downhole, non-isotopic generation of ioni sed...

G - Physics – 01 – V

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G01V 5/10 (2006.01) G01N 23/00 (2006.01)

Patent

CA 2668566

A method for downhole generation of non-radioactive, ionised radiation (28) arranged so as to be able to generate reverberation, particularly X-ray- and/or gamma radiation, from the surroundings (5) of a borehole (3), wherein the method comprises the steps of: exciting laser light (14) in a multistage laser light booster (12) by means of a pump-type laser light source (13) so as to form a pulsed laser light (14a), the incoming light energy being concentrated in restricted laser light pulses representing a higher amount of light energy than that of the continuous flux of laser light (14); forming a concentration of dissociated electrons (16, 32) in a vacuum chamber (15),- - focussing the pulsed laser light (14a) at a point in the concentration of dissociated electrons (16, 32) so as to form a field (wakefield) of pulsed electrons which, upon generation of Bremsstrahlung, emit ionised radiation (28) to the surroundings (5), thereby forming a high -energy reverberation in the gamma- and/or X-ray frequency range from the surroundings (5). An apparatus (1) for use when practising the method.

La présente invention concerne un procédé de production en fond de puits d'un rayonnement ionisé non radio-actif (28) capable d'être à l'origine de la réverbération en particulier d'un rayonnement X et/ou gamma issu des environs (5) d'un puits de forage (3), le procédé consistant à : émettre de la lumière laser (14) dans un amplificateur de lumière laser à étages multiples (12) au moyen d'une source de lumière laser de type pompe (13) de façon à former une lumière laser pulsée (14a), l'énergie de la lumière entrante étant concentrée dans des impulsions de lumière laser restreintes représentant une quantité d'énergie lumineuse supérieure à celle du flux continu de lumière laser (14); former une concentration d'électrons dissociés (16, 32) dans une chambre à vide (15); focaliser la lumière laser pulsée (14a) en un point de la concentration d'électrons dissociés (16, 32) de façon à former un champ (champ de sillage) d'électrons pulsés qui, à la production de Bremsstrahlung, émettent un rayonnement ionisé (28) vers les environs (5), pour ainsi former une réverbération fortement énergétique sur la plage de fréquences des rayons gamma et/ou X depuis les environs (5). L'invention a également pour objet un appareil (1) pour mettre en oeuvre le procédé.

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