GB1154484A - Process for Production of a Polycrystalline Lithium Fluoride Storage Phosphorescent Substance - Google Patents

Process for Production of a Polycrystalline Lithium Fluoride Storage Phosphorescent Substance

Info

Publication number
GB1154484A
GB1154484A GB2794966A GB2794966A GB1154484A GB 1154484 A GB1154484 A GB 1154484A GB 2794966 A GB2794966 A GB 2794966A GB 2794966 A GB2794966 A GB 2794966A GB 1154484 A GB1154484 A GB 1154484A
Authority
GB
United Kingdom
Prior art keywords
lif
mol
per cent
production
impurities
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2794966A
Inventor
Manfred Frank
Bernd-Udo Edelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VAKUTRONIK WISSENSCHAFTLICHER
Original Assignee
VAKUTRONIK WISSENSCHAFTLICHER
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by VAKUTRONIK WISSENSCHAFTLICHER filed Critical VAKUTRONIK WISSENSCHAFTLICHER
Priority to GB2794966A priority Critical patent/GB1154484A/en
Publication of GB1154484A publication Critical patent/GB1154484A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D15/00—Lithium compounds
    • C01D15/04—Halides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/0827—Halogenides
    • C09K11/0833—Halogenides with alkali or alkaline earth metals

Abstract

1,154,484. Luminescent materials. VAKUTRONIK WISSENSCHAFTLICHER INDUSTRIEBETRIEB DRESDEN VEB. 22 June, 1966, No. 27949/66. Heading C4S. In the production of a polycrystalline LiF storage phosphor of grain diameter 0À04 to 0À2 mm. for example with thermoluminescent glow maximum at 200‹ C., an activator combination is added to an aqueous lithium salt solution and the activator combination and LiF are precipitated together, the activator combinations of Mg-Ti, Mg-Eu, Mg-Ca, Mg- Ti-Ca or Mg-Eu-Ca being in amount Mg: 0À005 to 0À05 mol. per cent; Ca: 0À003 to 0À4 mol. per cent; Ti: 0À001 to 0À05 mol. percent; and Eu: 0À001 to 0À5 mol. per cent. The LiF is then washed to remove the acid, dried and annealed twice in platinum or quartz vessels in the range 560 to 650‹‹ C., for 10 to 120 mins. Impurities in the starting substances, such as Pb, Ag, Fe, Mn must not exceed 0.001%. The energy dependence may be changed by adding a subliminal, temperature-stable substance e.g. boronoxide or nitride and thermal neutron sensitivity may be increased by Li-6-Cl additions for instance. Before the first measurement the LiF may be exposed to 50 to 250 kR gamma radiation and heated to 280‹ to 320‹ C. or heated after each measurement to 380‹ to 450‹ C. Applications in dosimeters for operation in the range 0. to 10,000 rads are instanced for exposure to ionizing rays such as X-rays. A phosphor prepared includes also Si and Al impurities.
GB2794966A 1966-06-22 1966-06-22 Process for Production of a Polycrystalline Lithium Fluoride Storage Phosphorescent Substance Expired GB1154484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2794966A GB1154484A (en) 1966-06-22 1966-06-22 Process for Production of a Polycrystalline Lithium Fluoride Storage Phosphorescent Substance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2794966A GB1154484A (en) 1966-06-22 1966-06-22 Process for Production of a Polycrystalline Lithium Fluoride Storage Phosphorescent Substance

Publications (1)

Publication Number Publication Date
GB1154484A true GB1154484A (en) 1969-06-11

Family

ID=10267868

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2794966A Expired GB1154484A (en) 1966-06-22 1966-06-22 Process for Production of a Polycrystalline Lithium Fluoride Storage Phosphorescent Substance

Country Status (1)

Country Link
GB (1) GB1154484A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129519A (en) * 1976-06-29 1978-12-12 Nemoto Tokusho Kagaku Kabushiki Kaisha Thermo-luminescent material
US4217166A (en) * 1976-10-01 1980-08-12 Bayer Aktiengesellschaft Process for the production of lithium fluoride detectors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129519A (en) * 1976-06-29 1978-12-12 Nemoto Tokusho Kagaku Kabushiki Kaisha Thermo-luminescent material
US4217166A (en) * 1976-10-01 1980-08-12 Bayer Aktiengesellschaft Process for the production of lithium fluoride detectors

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