Abstract: A photostimulable storage phosphor within the scope of following formula (I):M.sub.3 (PO.sub.4).sub.2 :xEu.sup.2+, yT.sup.3+, zZr.sup.4+wherein: M is at least one of the alkaline earth metals selected from the group consisting of Ca, Sr and Ba, x corresponds with an atom fraction value 5.times.10.sup.-5 .ltoreq..times..ltoreq.10.sup.-1, y corresponds with an atom fraction value 0.ltoreq.y.ltoreq.10.sup.-1, T.sup.3+ is at least one member selected from the group consisting of La.sup.3+, Lu.sup.3+, y.sup.3+ and Gd.sup.3+, z corresponds with an atom fraction value 0.ltoreq.z.ltoreq.10.sup.-1, and 5.times.10.sup.-5 .ltoreq.z+y.ltoreq.10.sup.-1.

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 haloborate.

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: A process for the conversion of X-rays into blue and/or green light with a phosphor which on exposure to X-rays emits light the spectrum of which contains main intensity lines below 460 nm and/or main intensity lines between 530 and 570 nm, wherein said phosphor comprises a gadolinium gallium garnet compound having following empirical formula:Gd.sub.8-x-y Ln.sub.y Ga.sub.x O.sub.12wherein: 5.14.gtoreq.x.gtoreq.4.90 and 0.45.gtoreq.y.gtoreq.0.001, and Ln is scandium (Sc) and/or one or more rare earth elements other than gadolinium.The invention is directed particularly to the use of said phosphor in an X-ray conversion screen applied in medical radiography.