THERMOLUMINESCENCE STUDIES OF THE GAMMA-IRRADIATED FERROELECTRICS ROCHELLE SALT AND GUANIDINE ALUMINUM SULFATE HEXAHYDRATE

Technical Report · Tue Sep 01 04:00:00 EDT 1959

OSTI ID:4245486

Gilliland, Jr, J W

S>Samples of Rochelle salt and guanidine alunainum sulfate hexahydrate were irradiated with various doses of C0/sup 60/ gammas up to 3.5 x 10/sup 6/ r at liquid nitrogen temperature after which they were warmed at a constant rate and observed with a 1P28 photomultiplier tube. Pure Rochelle salt single crystals were found to yield no thermolunainescence glow which is detectable, and it is estimated that the minimum amount of detectable luminescence by the method used is less than 10,000 photons per second. The reagent grade Rochelle salt puwder was found to produce a glow peak at about --61 deg C which was removed completely by two recrystallizations from water solution. This peak corresponds to a trap depth of about 0.42 ev. Guanidine alunainum sulfate hexahydrate showed three glow peaks at -- 146 deg C, -- 119 deg C, and about --5 deg C, correspcnding to trap depths of 0.25 ev, 0.31 ev, and 0.54 ev, respectively. The major peak at --146 deg C becomes more prominent as the dose is increased to 3.5 x 10/sup 6/ r. At low doses (10,000 r) the --119 deg C peak is largest but becomes completely concealed by the lower temperature peak at 3.5 x 10/sup 6/ r. The low and very broad peak at--5 deg C is most easily seen at intermediate doses of 10/sup 5/ and 10/sup 6/ r. At lower doses it becomes undetectable, and at higher doses it is poorly resolved because of interference from a low diffuse glow following the large peak at --146 deg C and from spurious signals. The spurious signals observed from Rochelle salt on an oscillosoope were fouud to be of the order of 10 mu sec duration. It is suggested that these spurious signals may be the result of triboluminescence in the crystal produced by thermal expansion or contraction. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-13-020348
• OSTI ID: 4245486
• Report Number(s): ORNL-2783
• Country of Publication: United States
• Language: English

Related Subjects

ALUMINUM SULFATES
CRYSTALLIZATION
EXPANSION
FERROELECTRIC MATERIALS
FERROMAGNETIC MATERIALS
GAMMA RADIATION
GUANIDINE
HYDRATES
IRRADIATION
LOW TEMPERATURE
LUMINESCENCE
MEASURED VALUES
MONOCRYSTALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OSCILLOGRAPHS
PHOTOMULTIPLIERS
PHOTONS
PHYSICS AND MATHEMATICS
POTASSIUM COMPOUNDS
POWDERS
RADIATION DOSES
SALTS
SENSITIVITY
SODIUM COMPOUNDS
TARTARIC ACID
TEMPERATURE
TRAPS
WATER