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Process for producing a self luminescent material

Abstract

A self luminescent material is produced by a process comprising applying a hydroxide or fluoride of promethium-147 suspended in a medium of paraffinic acid to the surface of a fluorescent body. Promethium-147 decays with a half-life of 2.6 years and emits beta-rays but not alpha- and gamma-rays so that it is suitable for manufacturing self luminescent materials. A chloride of promethium-147 cannot be employed because its structure is destroyed by acids. Although fluorides and hydroxides of promethium-147 are difficult to mix with the fluorescent body material, they become mixable when paraffinic acids containing from 12 to 20 carbon atoms, (for example, steric acid, palmitic acid and margaric acid) are used as a medium. In embodiments, the self luminescent materials are prepared by either neutralization of a promethium-147 chloride solution having a specific radioactivity of 1.2 c/cc. with an ammonium hydroxide solution to form gelatinous hydroxide, or the reaction of a promethium-147 chloride solution with H/sub 2/SiF/sub 6/ by heating at 80/sup 0/C to form a fluoride of promethium-147. The products have a specific radioactivity of 8 to 12 mc/g. These products are suspended in vehicles of polystyrene and methacrylic resin to produce the self luminescent coating materials. Tests show that  More>>
Authors:
Publication Date:
Jan 28, 1962
Product Type:
Patent
Report Number:
JP 1973-31829; B
Reference Number:
AIX-07-233656; EDB-76-054494
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; 07 ISOTOPES AND RADIATION SOURCES; PROMETHIUM 147; RADIOCHEMISTRY; RESINS; RADIOLUMINESCENCE; BETA SOURCES; BRIGHTNESS; HEXADECANOIC ACID; LUMINOUS PAINTS; OCTADECANOIC ACID; PHOSPHORS; PROMETHIUM FLUORIDES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBOXYLIC ACIDS; CHEMISTRY; COATINGS; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; INTERMEDIATE MASS NUCLEI; ISOTOPES; LUMINESCENCE; MONOCARBOXYLIC ACIDS; NUCLEI; ODD-EVEN NUCLEI; OPTICAL PROPERTIES; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PAINTS; PARTICLE SOURCES; PETROCHEMICALS; PETROLEUM PRODUCTS; PHYSICAL PROPERTIES; POLYMERS; PROMETHIUM COMPOUNDS; PROMETHIUM ISOTOPES; RADIATION SOURCES; RADIOISOTOPES; RARE EARTH COMPOUNDS; RARE EARTH ISOTOPES; RARE EARTH NUCLEI; YEARS LIVING RADIOISOTOPES; 400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials; 070204 - Radiation Sources- Industrial Uses, Radiometric
OSTI ID:
7363419
Country of Origin:
Japan
Language:
Japanese
Submitting Site:
INIS
Size:
Pages: 2
Announcement Date:

Citation Formats

Abe, E. Process for producing a self luminescent material. Japan: N. p., 1962. Web.
Abe, E. Process for producing a self luminescent material. Japan.
Abe, E. 1962. "Process for producing a self luminescent material." Japan.
@misc{etde_7363419,
title = {Process for producing a self luminescent material}
author = {Abe, E}
abstractNote = {A self luminescent material is produced by a process comprising applying a hydroxide or fluoride of promethium-147 suspended in a medium of paraffinic acid to the surface of a fluorescent body. Promethium-147 decays with a half-life of 2.6 years and emits beta-rays but not alpha- and gamma-rays so that it is suitable for manufacturing self luminescent materials. A chloride of promethium-147 cannot be employed because its structure is destroyed by acids. Although fluorides and hydroxides of promethium-147 are difficult to mix with the fluorescent body material, they become mixable when paraffinic acids containing from 12 to 20 carbon atoms, (for example, steric acid, palmitic acid and margaric acid) are used as a medium. In embodiments, the self luminescent materials are prepared by either neutralization of a promethium-147 chloride solution having a specific radioactivity of 1.2 c/cc. with an ammonium hydroxide solution to form gelatinous hydroxide, or the reaction of a promethium-147 chloride solution with H/sub 2/SiF/sub 6/ by heating at 80/sup 0/C to form a fluoride of promethium-147. The products have a specific radioactivity of 8 to 12 mc/g. These products are suspended in vehicles of polystyrene and methacrylic resin to produce the self luminescent coating materials. Tests show that the initical brightness is comparatively high, the decreasing rate of brightness is small, no blackening effects by alpha-rays occur and costs are low. The brightness of the coating containing promethium-147 is 82-85 after 5 days, 100-105 after 100 days and 82-92 after 180 days. With respect to the coating containing radium the values are 31-70 after 5 days, 28-49 after 100 days and 19-31 after 180 days.}
place = {Japan}
year = {1962}
month = {Jan}
}