Patent ID: 7894577

Claim:
A method for downhole generation of non-radioactive, ionised radiation arranged so as to be able to generate reverberation, particularly X-ray- and/or gamma radiation, from the surroundings of a borehole, wherein the method comprises the steps of: forming a laser light; directing the laser light into a multistage laser light booster; exciting the laser light by means of a pump-type laser light source so as to form a pulsed laser light, 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; forming a concentration of dissociated electrons in a vacuum chamber; focussing the pulsed laser light at a point in the concentration of dissociated electrons so as to form a field (wakefield) of pulsed electrons which, upon generation of Bremsstrahlung, emit ionised radiation to the surroundings, thereby forming a high-energy reverberation in the gamma- and/or X-ray frequency range from the surroundings.