A STUDY ON RADIOACTIVE SELF-LUMINOUS COMPOUNDS. I. LUMINESCENCE EFFICIENCY OF RADIOACTIVE SELF-LUMINOUS COMPOUNDS

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Proc. Japan Conf. Radioisotopes

OSTI ID:4683762

Huzimura, R; Ato, Y; Oishi, M

The luminescence efficiency of radioactive self-luminous compounds is studied. Luminescence is obtained by the direct mixing of a radioisotope in a phosphor or by the external irradiation of a phosphor with BETA rays. In a mixed sample with constant specific activity, the leakage dose of BETA rays and the light intensity increase simultaneously with the thickness and begin to saturate at about 100 mg/cm/sup 2/. The relative luminescence efficiency, i.e., the ratio of light intensity to BETA intensity, decreases slowly with the concentration of the carrier isotope and /or with the specific activity. The BETA energy dependence with P-32, S-35, Ca-45, and Sr-90--Y-90 shows that the lower exciting energy induces the higher efficiency. Effects of the composition or the structure of the phosphors are shown. The luminescence induced by irradiation with ultraviolet light is also presented. The phosphors of silicate and tungstate type are luminous by BETA -ray excitation but not by uv light. Among the phosphors of zinc sulfide type, those fired at relatively low temperatures or in H/sub 2/S gas are poor materials for both the excitations. (T.F.H.)

• Research Organization: Government Industrial Research Inst., Nagoya
• NSA Number: NSA-17-029964
• OSTI ID: 4683762
• Journal Information: Proc. Japan Conf. Radioisotopes, Journal Name: Proc. Japan Conf. Radioisotopes Vol. Vol: 4th
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

BETA PARTICLES
CALCIUM 45
COMPOUNDS
CONFIGURATION
EFFICIENCY
ENERGY LEVELS
EXCITATION
GASES
GENERAL AND MISCELLANEOUS
HYDROGEN SULFIDES
IRRADIATION
LEAKAGE
LIGHT
LOW TEMPERATURE
LUMINESCENCE
PHOSPHORS
PHOSPHORUS 32
QUANTITY RATIO
RADIATION DOSES
RADIOACTIVITY
RADIOISOTOPES
SHIELDING
SILICATES
STRONTIUM 90
SULFUR 35
THICKNESS
TUNGSTATES
TUNGSTEN OXIDES
ULTRAVIOLET RADIATION
YTTRIUM 90