USE OF A CaSO$sub 4$(Sm) PHOSPHOR IN DOSIMETRY

Journal Article · Thu Jun 01 04:00:00 EDT 1961 · Atomnaya Energ.

OSTI ID:4843586

Krasnaya, A R; Nosenko, B M; Revzin, L S; Yaskolko, V Ya

A previous investigation had shown that a CaSO/sub 4/(Mn) phosphor had a limited capacity to store light. In investigating the use of Pb, Zn, Bi, Ag, Tl, Co, Ba, Ni, Mg, Hg, qd, Sr, and Sm as activatcrs, it was found that only the CaSO/ sub 4/(Sm--0.1 mol%) phosphor had an ample capacity for storing light with sufficient sensitivity. The thermoemission curve for the CaSO/sub 4/(Sm) phosphor has three peaks with maxima at 65, 120, and 200 deg C. The high- temperature (200 deg C) peak is the most intense with a light sum equal to 90% of the total light sum. The thermoluminescence spectra are the same for a wide range of beta and gamma energies. The stored light sum depends linearly on the dose from 0.1 to 25,000 r. At 40 deg C the phosphor loses 10% of its stored light sum in a week, exclusively at the expense of the first and second thermoemission peaks. The third peak retains its light sum for a month or longer. The third peak does not emit light at 70 deg C, but at 120 deg C it emits 60% of its stored light sum in 24 hours. On irradiating the phosphor at a dose strength of 0.005 r/ hr for 42 days, it was found that the stored light sum was equal to the computed value corresponding to a total dose of 5 r. Visible light does not cause excitation of the CaSO/sub 4/(Sm) phosphor, but rather causes it to lose some of its stored light energy (25% in 4 hours). This phosphor is suitable for use at elevated temperatures (up to lOO deg C) for prolonged measurements. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-027804
• OSTI ID: 4843586
• Journal Information: Atomnaya Energ., Journal Name: Atomnaya Energ. Vol. Vol: 10
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ACTIVATION
BARIUM
BETA PARTICLES
BISMUTH
CADMIUM
CALCIUM SULFATES
COBALT
EMISSION
ENERGY LEVELS
ENGINEERING AND EQUIPMENT
GAMMA RADIATION
HIGH TEMPERATURE
LEAD
LIGHT
LUMINESCENCE
MAGNESIUM
MEASURED VALUES
MERCURY
NICKEL
PHOSPHORS
RADIATION DOSES
SAMARIUM
SENSITIVITY
SILVER
SPECTRA
STRONTIUM
TEMPERATURE
THALLIUM
USES
ZINC