SiAlON Phosphor Radiation Detector High-Temperature Stability
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Solution Overview
Problem
Current scintillator materials like ZnS:Ag,Cu are not suitable for high-temperature environments and suffer significant degradation under high-density radiation, leading to inaccurate dose measurements and frequent replacements in radiation measurement equipment used in nuclear power facilities and accelerator facilities.
Innovation Solution
A charged particle radiation measuring method and device utilizing a β-type SiAlON phosphor with the general formula Eu x Si 6-z Al z O z N 8-z, where 0.01 ≤ x ≤ 0.5 and 0 < z ≤ 4.2, which maintains luminescence efficiency even at high temperatures and under high-density radiation, combined with an optical component and a measuring portion to collect and read radiation-induced light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ZnS:Ag,Cu scintillator materials are used for radiation measurement, then luminous efficiency is improved, but the materials cannot withstand high-temperature environments (100°C or higher)
Solution Approach 1:
The patent changes the material composition parameters by doping Sr2Si5N8:Eu with Al and O to create Sr2-zAlzSi5-zOzN8-x:Eu phosphor, which enables the scintillator to maintain stable luminescence properties at high temperatures up to 500°C while preserving luminous efficiency
Solution Approach 2:
The patent creates a composite phosphor material combining Sr2Si5N8 host lattice with Eu activator and Al/O dopants, forming a new composite scintillator material that simultaneously achieves high-temperature stability and maintained luminous efficiency
2Illumination intensity
If ZnS:Ag,Cu scintillator materials are used for radiation measurement, then initial luminous intensity is achieved, but luminous intensity degrades significantly under high-density radiation
Solution Approach 1:
The patent modifies the material composition by introducing Al and O dopants into the Sr2Si5N8:Eu phosphor structure, which changes the crystal lattice parameters and electronic structure to resist radiation-induced damage, maintaining stable luminescence under high-density charged particle irradiation
Solution Approach 2:
The patent replaces the short-lived ZnS:Ag,Cu scintillator material that degrades under radiation with a more stable Sr2-zAlzSi5-zOzN8-x:Eu phosphor that maintains reliability over extended periods under high-density radiation conditions
3Measurement precision
If existing scintillator materials are used in high-temperature environments, then initial measurements can be taken, but measurement precision deteriorates over time
Solution Approach 1:
The patent changes the thermal stability parameters of the scintillator material by using Sr2-zAlzSi5-zOzN8-x:Eu phosphor with optimized doping concentrations, which maintains consistent luminescence response over extended periods at high temperatures, ensuring long-term measurement precision
Solution Approach 2:
The patent provides more than sufficient thermal stability by designing the phosphor to remain stable up to 500°C, which far exceeds the 100°C operational requirement, ensuring measurement precision is maintained throughout the intended measurement duration
4Measurement precision
If ZnS:Ag,Cu scintillator materials are used in accelerator facilities, then initial beam quality measurement is achieved, but work efficiency decreases due to frequent replacement
Solution Approach 1:
The patent replaces the frequently degrading ZnS:Ag,Cu scintillator with a durable Sr2-zAlzSi5-zOzN8-x:Eu phosphor that resists high-density radiation damage, eliminating the need for frequent replacements and maintaining continuous operating efficiency in accelerator facilities
Solution Approach 2:
The patent performs preliminary material design and optimization to create a radiation-resistant phosphor before deployment, ensuring the scintillator can withstand the full operational lifetime in accelerator facilities without requiring replacement, thus maintaining productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides highly heat-resistant and radiation-resistant radiation measuring equipment capable of precise measurements over extended periods, even in high-temperature environments, with sustained luminescence intensity and prolonged equipment lifespan.
Implementation Method 1
scintillators are substances that generate light when radiation impinges thereon
Implementation Method 2
an optical component that selectively collects light from the scintillator
Implementation Method 3
a measuring portion that reads out light generated by radiation
Data Source
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AI summary
[Problem] To provide highly heat-resistant and radiation-resistant radiation measuring equipment. [Solution] Provided are a charged particle radiation measuring method and a charged particle radiation measuring device using a scintillator comprising a phosphor in which the main component is a SiAlON phosphor.