Praseodymium activated lead fluoride scintillation crystal material and preparation method thereof

A scintillation crystal, lead fluoride technology, applied in the direction of polycrystalline material growth, chemical instruments and methods, crystal growth, etc., can solve problems such as the inability to use dual-read calorimeters

Inactive Publication Date: 2017-05-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead fluoride crystals can produce scintillation light by introducing luminescent ions such as europium and terbium into the lead fluoride crystal, but the decay time of scintillation luminescence of lead fluoride doped with europium, terbium, etc. use on energy

Method used

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  • Praseodymium activated lead fluoride scintillation crystal material and preparation method thereof
  • Praseodymium activated lead fluoride scintillation crystal material and preparation method thereof
  • Praseodymium activated lead fluoride scintillation crystal material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 Crucible descending method grows Pr 0.005 PbF 2.015 the crystal

[0035] PrF with a purity of 99.99% 3 and PbF 2 According to molecular formula Pr 0.005 PbF 2.015 The ratio is accurately weighed, and the total mass of raw materials is 500 grams; the raw materials are fully mixed and dried in a vacuum oven at 200°C for 10 hours; the dried raw materials are transferred into a 20×20×200mm In a platinum crucible, seal the crucible; place the crucible in a descending growth furnace, then control the growth furnace to heat up at a rate of 30°C / min until the temperature of the platinum crucible is 890°C, and keep it warm for 5 hours; crystal growth solid-liquid interface The temperature gradient is set to 35°C / cm; the crucible is slowly lowered at a speed of 2mm / hour; after the crystal growth is completed, the temperature is slowly lowered to room temperature at 30°C / hour. Cut, grind and polish the grown crystal into a 14.3×14.3×1 mm crystal sample. Its tra...

Embodiment 2

[0036] Embodiment 2 crucible descending method grows Pr 0.01 PbF 2.03 the crystal

[0037] PrF with a purity of 99.99% 3 and PbF 2 According to molecular formula Pr 0.01 PbF 2.03 Proportioning is accurately weighed, and the total mass of raw materials is 500 grams; the raw materials are fully mixed and then dried in a vacuum oven at 200°C for 30 hours; the dried PrF 3 and PbF 2Under the protection of dry Ar, it is transferred into a platinum crucible with a size of 20 × 20 × 200mm, and the crucible is sealed; the crucible is placed in a descending method growth furnace, and then the growth furnace is controlled to heat up at a rate of 30°C / min until the platinum crucible The temperature was 890°C and kept for 5 hours; the temperature gradient of the solid-liquid interface for crystal growth was set at 30°C / cm; the crucible was slowly lowered at a speed of 2mm / hour; after the crystal growth was completed, the temperature was slowly lowered at 30°C / hour to room temperature...

Embodiment 3

[0038] Embodiment 3 The crucible descending method grows Pr 0.0005 PbF 2.0015 the crystal

[0039] PrF with a purity of 99.99% 3 and PbF 2 According to molecular formula Pr 0.0001 PbF 2.0015 Proportioning is accurately weighed, and the total mass of raw materials is 500 grams; the raw materials are fully mixed and then dried in a vacuum oven at 200°C for 30 hours; the dried PrF 3 and PbF 2 Under the protection of dry Ar, it is transferred into a platinum crucible with a size of 20 × 20 × 200mm, and the crucible is sealed; the crucible is placed in a descending method growth furnace, and then the growth furnace is controlled to heat up at a rate of 30°C / min until the platinum crucible The temperature was 890°C and kept for 5 hours; the temperature gradient of the solid-liquid interface for crystal growth was set at 35°C / cm; the crucible was slowly lowered at a speed of 2mm / hour; after the crystal growth was completed, the temperature was slowly lowered at 30°C / hour to roo...

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Abstract

The invention relates to a praseodymium activated lead fluoride scintillation crystal material and a preparation method thereof. A chemical general formula of the praseodymium activated lead fluoride scintillation crystal material is PrxPbF2 + 3x, wherein x is 0.0005-0.01. Praseodymium (Pr) is introduced to lead fluoride crystals, the Pr content in the PrxPbF2 + 3x is controlled to be 0.0005-0.01, the lead fluoride crystals can produce flare light, the effect of a crystal field of fluoride ion matrix lead fluoride is strong, and the scintillating luminescence decay time of the praseodymium activated lead fluoride crystal is shortened.

Description

technical field [0001] The invention relates to a scintillation crystal, in particular to a praseodymium-activated lead fluoride scintillation crystal material and a preparation method thereof. Background technique [0002] The electromagnetic calorimeter is one of the main components of high-energy physics experiments, and its main function is to discover new elementary particles and precisely measure their energy. The key component of the electromagnetic energy device is the detector, which is usually composed of scintillation detection crystals (or Cherenkov detection materials, etc.) and photoelectric conversion devices (such as photomultiplier tubes); the scintillation crystals (or Cherenkov detection materials) The energy carried by the particles can be converted into pulsed light, and the photoelectric conversion device is responsible for converting the light signal into an electrical signal. [0003] In 2012, the electromagnetic energy device of the Large Hadron Col...

Claims

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Application Information

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IPC IPC(8): C30B29/12C30B11/00
CPCC30B29/12C30B11/00
Inventor 毛日华王勇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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