Abstract: A radiation image recording and reproducing method is provided, comprising the steps of:i. causing a radiation image storage panel containing a photostimulable phosphor to absorb radiation having passed through an object or having been radiated from an object,ii. exposing said image storage panel to stimulating rays to release the radiation energy stored therein as light emission, the stimulating rays being electromagnetic waves having a wavelength within the range of 700-900 nmiii. detecting the emitted light, characterised in that said photostimulable phosphor corresponds to the general formula:Ba.sub.1-x-y"-z-r Sr.sub.x Pb.sub.y" Cs.sub.2r Eu.sub.z F.sub.2-a-b Br.sub.a I.sub.b,wherein0.ltoreq.x.ltoreq.0.30, 10.sup.-4 <y"<10.sup.-3,10.sup.-7 <z<0.15, 0.ltoreq.r<0.05, 0.75.ltoreq.a+b.ltoreq.1.00, 0.05<b<0.20.

Abstract: A method of erasing energy stored in a photostimulable Eu.sup.2+ doped alkaline earth halide phosphor medium, wherein in said method after imagewise exposure of said medium to penetrating radiation and read out of stored energy by photostimulation with light in the wavelength range of 430 to 550 nm, said phosphor medium is exposed in a single erasure step with light mainly within the 370 to 530 nm range containing two distinct or separate emission bands, one of which is peaking at or near 400 nm and the other at or near 500 nm.

Abstract: A method for recording and reproducing an X-ray image is provided which method comprises the steps of:(1) causing a photostimulable phosphor to absorb image-wise or pattern-wise modulated X-rays,(2) photostimulating said phosphor with stimulating electromagnetic radiation selected from visible light and infrared light to release from the phosphor in accordance with the absorbed X-rays electromagnetic radiation different in wavelength characteristic from the radiation used in the photo-stimulation, and(3) detecting said light emitted by photostimulation, wherein said phosphor is a halosilicate containing as host metal at least one member selected from the group consisting of Ca, Sr, Ba, Mg, Cd, Zn and Pb, as halogen at least one member selected from the group consisting of Cl, Br and I, and comprising as dopant(s) Eu.sup.2+ and/or Cr.sup.3+.

Abstract: Device for correcting deviations upon focussing a laser beam, which comprises electronic means, among which a quadrant detector, for forming with the output signals of said quadrant detector a correction signal -K.sub.1 V.sub.c H.sub.c /.SIGMA. (18), which is added (19) to the focussing signal (A+C)-(B+D) formed in circuit 14, A, B, C and D being the output signals of the quadrant detector (9a, 9b, 9c, 9d),V.sub.c =(A+B)-(C+D)formed in circuit 15;H.sub.c =(A+D)-(B+C)formed in circuit 17;.SIGMA.=A+B+C+Dformed in circuit 16 and K.sub.1 being a constant.