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Thermo-luminescent material
| Details |
Inventors: Matsuzawa, Takashi;
Assignee: Nemoto Tokusho Kagaku Kabushiki Kaisha (JP)
Primary Examiner: Cooper; Jack
Assistant Examiner:
Attorney, Agent or Firm: McGlew and Tuttle
A lithium fluoride thermo-luminescent material with increased sensitivity, which comprises crystals or powdery crystallites of lithium fluoride having present therein (A) luminescent center consisting of magnesium and at least one element or more selected from the elemental group consisting of copper, silver, and gold, and (B) sensitizer therefor consisting of at least one element or more selected from the elemental group consisting of carbon, phosphorus, sulfur, arsenic, selenium and tellurium. |
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DETAILED DESCRIPTION Extensive studies have therefore been made with a view to eliminating such drawbacks involved in the use of lithium fluoride as mentioned above and it has now been found that addition thereto of certain metals or non-metals leads to a significant difference in its intensifying activity.
The present invention has been accomplished on the basis of this finding.
Thus in accordance with the present invention, the amount of light emission by thermo-luminescence can be markedly increased without adversely influencing the advantageous characteristics inherent to lithium fluoride, and the low measurement sensitivity in dosimetry at low doses, which has been hitherto regarded as the greatest drawback involved in the use of lithium fluoride, can be improved to a remarkable extent.
More specifically, the present invention provides a thermo-luminescent material capable of emitting an intense light as of such intensity as is higher than that of previous materials (in which magnesium alone is used as luminescent center) by factors of several tens to one hundred.
The thermo-luminescent material in accordance with the present invention comprises crystals or powdery crystallites of lithium fluoride having present therein (A) luminescent center consisting of magnesium in combination with at least one element or more selected from the elemental group consisting of calcium strontium, copper, silver, and gold, aluminum and gallium and (B) sensitizer therefor consisting of at least one element or more selected from the non-metallic elemental group consisting of boron, carbon, silicon, phosphorus, sulfur, arsenic, selenium and tellurium.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
For a better understanding of the invention, its advantages and specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated preferred embodiments of the invention
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