Kasei Optonix, Ltd.

Other

Dai Nippon Toryo Co., Ltd.

Yuji Aoki

Norio Miura

Akio Umemoto

Yujiro Suzuki

Hidenaga Horiuchi

Etsuo Shimizu

Hideo Suzuki

Keiji Shimiya

Etsuo Mori

Takeshi Akiwa

Hisao Suzuki

Masamichi Itabashi

Katuyosi Numata

A radiographic intensifying screen having at least a fluorescent layer and a protective layer on a support, wherein the protective layer has a multi-layer structure comprising at least one layer of an organic macromolecule film and a film-forming resin layer provided on the surface of the organic macromolecule film at least on the side which is not in contact with the fluorescent layer, and the resin of the film-forming resin layer is different from the resin of the organic macromolecule film.

Radiographic intensifying screen

Rare earth oxysulfide phosphor and X-ray detector using the same

A radiographic intensifying screen which comprises a support, a fluorescent layer formed thereon comprising an X-ray luminescent phosphor and a binder resin supporting the X-ray luminescent phosphor in a dispersed state, and a protective layer formed on the fluorescent layer, wherein the proportion of the binder resin to the X-ray luminescent phosphor is within a range of from 4 to 8% by weight on the average of the entire fluorescent layer, and the binder resin is unevenly distributed in the fluorescent layer so that the proportion of the binder resin to the X-ray luminescent phosphor in the fluorescent layer in the vicinity of the protective layer is higher than the proportion of the binder resin to the X-ray excitable phosphor in the remainder of the fluorescent layer.

A gradient radiation image conversion sheet, comprising a protective layer a fluorescent layer and a support layer, and the transmissions of said protective layer and/or said fluorescent layer are partially changed and the dots of the print of said gradient patterns and the border between the printed area and the unprinted area are blurred. The gradient image conversion sheet has a gradation area in which the change in transmission is extremely smooth and a speed ratio which may be set in a relatively wide range, and the sheet can be produced through a mass-production system to give products of constant quality.

Gradient radiation image conversion sheet

A gradient intensifying screen comprising a support, a fluorescent layer formed on the support and a transparent protective layer formed on the fluorescent layer, characterized in that at least a part of the transparent protective layer is dyed with a dyestuff so that the light transmission of the transparent protective layer is partially varied.

Gradient intensifying screen

An intensifying screen comprising: a support, a fluorescent layer on the support and a protective layer on the fluorescent layer, wherein the fluorescent layer is composed essentially of a blue emitting phosphor selected from the group consisting of (1) a M.sup.II WO.sub.4 phosphor wherein M.sup.II is at least one of Mg, Ca, Zn and Cd, (2) a CaWO.sub.4 phosphor, (3) a BaSO.sub.4 :Pb phosphor, (4) a BaSO.sub.4 :Eu.sup.2+ phosphor, (5) a (Ba, Sr)SO.sub.4 :Eu.sup.2+ phosphor, (6) a MeF.sub.2.pMe'X.sub.2.qKX'.rMe'SO.sub.4 :mEu.sup.2+, nTb.sup.3+ phosphor, wherein Me is at least one of Mg, Ca, Sr and Ba, each of Me' and Me' is at least one of Ca, Sr and Ba, each of X and X' is at least one of Cl and Br, and p, q, r, m and n are numbers which satisfy the conditions of 0.80.ltoreq.p.ltoreq.1.5, 0.ltoreq.q.ltoreq.2.0, 0.ltoreq.r.ltoreq.1.0, 0.001.ltoreq.m.ltoreq.0.10 and 0.ltoreq.n.ltoreq.0.05, respectively, provided q+r.noteq.0, (7) a LnOX:Tm phosphor wherein Ln is La or Gd, and X is Cl or Br, (8) a Ln(Ta.sub.1-x, Nb.sub.x)O.sub.4 :Tm phosphor wherein Ln is at least one of La, Y Gd and Lu, and 0.ltoreq.x.ltoreq.0.3, (9) a Y.sub.2 O.sub.2 S:Tb phosphor, (10) a CsI:Na phosphor, (11) a CsI:T1 phosphor, (12) a NaI phosphor, (13) a ZnS:Ag phosphor and (14) a HfP.sub.2 O.sub.7 : Cu phosphor, and wherein at least one of the fluorescent and protective layers is colored with a colorant which has a main absorption peak at a wavelength in the region of 400 to 600 nm.

Intensifying screens

A radiographic intensifying screen comprising a support and a fluorescent layer formed on the support, characterized in that said fluorescent layer is composed essentially of a rare earth oxysulfide phosphor represented by the formula:

An X-ray intensifying screen having a high speed and capable of providing good image quality superior in sharpness, granularity and contrast comprising a support having formed thereon a fluorescent layer composed of a complex halide phosphor represented by the composition formula shown below and having further formed on the fluorescent layer another fluorescent layer composed of a calcium tungstate phosphor:

Growing community of inventors

Odawara, Japan

Yuji Aoki