公开(公告)号：US3920802A

公开(公告)日：1975-11-18

申请号：US44794874

申请日：1974-03-04

Applicant: KEWANEE OIL CO

Inventor： MOSS ROBERT H ,  SWINEHART CARL F ,  SPICUZZA WILLIAM F

IPC: C01F5/28 ,  G02B1/00

CPC classification number: G02B1/00 ,  C01F5/28 ,  C01P2002/01 ,  C01P2002/82 ,  C01P2004/51 ,  C01P2004/61

Abstract: A process is disclosed for converting basic magnesium carbonate into pure hot-pressable magnesium fluoride such as is used for the hot-pressing of infra-red radiation transmitting optical bodies. The process includes contacting a slurry of basic magnesium carbonate with carbon dioxide to form enough magnesium bicarbonate or hydrates of magnesium carbonate, in situ, to alter the particles in the slurry. Carbonation of the slurry increases solubility of the solids by establishing an equilibrium relationship in solution between the unstable magnesium bicarbonate and hydrates of magnesium carbonate particles. When the carbonated slurry is contacted with a slight excess of hydrofluoric acid it precipitates solid particles of fine hydrous magnesium fluoride. Neutralization of excess hydrofluoric acid is effected with ammonium hydroxide. The solid particulate precipitate is dried and calcined to yield hot-pressable magnesium fluoride powder of exceptional purity and consistent quality. A hot-pressable magnesium fluoride powder has been prepared which has a specific and uniform refractive index, nD 1.3850 at 20* C; the powder is made up of primary particles the majority of which have an average particle diameter of greater than 5 Mu (microns), permitting the hot-pressing of the powder without grinding it.

公开(公告)号：US3930160A

公开(公告)日：1975-12-30

申请号：US44158474

申请日：1974-02-11

Applicant: KEWANEE OIL CO

Inventor： SWINEHART CARL F

IPC: G01T1/20 ,  G01T1/202

CPC classification number: G01T1/2002

Abstract: Scintillation crystals are disclosed which have improved resolution and pulse height. An improved crystal has shallow grooves or spot depressions cut in the window, usually an end surface. Typical grooves are about 1.5 mm wide and about .1 mm deep. The grooves may be either horizontal, generally parallel grooves in spaced apart relationship, or concentric rings in radially spaced apart relationship. A light pipe of high refractive index, such as a crystal of pure sodium iodide, may also be improved with shallow grooves or spot depressions cut in an end surface.

Abstract translation: 公开了具有改善的分辨率和脉冲高度的闪烁晶体。 改进的晶体在窗口中切割出浅的凹槽或斑点，通常是端面。 典型的槽宽约1.5毫米，厚约0.1毫米。 凹槽可以是水平的，大致平行的间隔开的凹槽，也可以是沿径向隔开的关系的同心环。 高折射率的光管，例如纯碘化钠的晶体，也可以通过在端面切割的浅沟槽或斑点凹陷来改善。

公开(公告)号：US3320180A

公开(公告)日：1967-05-16

申请号：US32224863

申请日：1963-11-07

Applicant: KEWANEE OIL CO

Inventor： SWINEHART CARL F

IPC: C09K11/08 ,  G01T1/11

CPC classification number: C09K11/0833 ,  G01T1/11