Neutron Detector Substrate Doping for Indirect Flux Measurement
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Solution Overview
Problem
Standard PIPS detectors are ill-suited for detecting neutral particles, such as neutrons, due to their reliance on the photovoltaic effect and sensitivity to charged particles, which limits their ability to quantify neutral particle flux effectively.
Innovation Solution
Modifying the PIPS detector by incorporating a substrate that interacts with neutrons to generate observable signals, such as gamma rays, through nuclear reactions, allowing for the indirect measurement of neutron flux by reacting with dopant elements like Ba, As, or Si, and using coatings to filter out irrelevant energies, thereby enhancing detection capabilities for neutral particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PIPS detectors use the photovoltaic effect to detect charged particles, then detection of charged particles is effective, but detection of neutral particles like neutrons is ill-suited
Solution Approach 1:
The patent introduces a scintillator material as an intermediary between neutrons and the PIPS detector. The scintillator converts neutron interactions into visible photons, which the PIPS detector then detects through its photovoltaic effect. This mediator enables the detector to indirectly measure neutral particle flux while maintaining its charged particle detection capabilities.
Solution Approach 2:
The patent modifies the detector's operational parameters by coupling it with a scintillator material that changes the nature of the detected signal. Instead of directly detecting charged particles, the system detects photons generated by scintillation processes, effectively changing the detection parameter from charged particle signal to optical signal while preserving the PIPS detector's core functionality.
2Measurement precision
If SiPM detectors are used to detect photons from neutron collisions, then neutron flux measurement is possible, but the detector is also sensitive to photons generated inside the detector creating interference
Solution Approach 1:
The patent extracts and removes the problematic internal photon detection capability from the system by using a scintillator-based approach with a PIPS detector. The scintillator is positioned to only detect photons from neutron interactions, while the PIPS detector's inherent insensitivity to internal photons eliminates the interference problem that plagues SiPM detectors.
Solution Approach 2:
The patent converts the PIPS detector's weakness (insensitivity to photons) into a benefit by using a scintillator to convert neutron interactions into detectable photons. The detector's photovoltaic effect, originally limited to charged particles, now effectively detects neutron-induced scintillation photons while being naturally immune to internal photon interference.
3Adaptability or versatility
If fiberoptic cables are used to transmit photons from neutron interactions, then neutron detection is enabled, but photons generated inside the optical fibers are detected creating background noise
Solution Approach 1:
The patent uses a scintillator as an intermediary that is specifically designed to convert neutron interactions into photons at wavelengths optimal for PIPS detector detection. This intermediary approach enables neutron detection through fiberoptic cables while the PIPS detector's selective photovoltaic response maintains better signal-to-noise ratio compared to direct SiPM detection of internal photons.
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 modified detector effectively measures neutron flux by converting neutron interactions into detectable signals, improving the ability to quantify neutral particles while maintaining cost benefits of standard detectors.
Implementation Method 1
The substrate comprises a material that interacts with an incoming neutron to generate an observable signal
Implementation Method 2
PIPS detectors use the photovoltaic effect to count the number of charged particles during rated when radiation enters the detector
Implementation Method 3
An incoming neutron will sometimes collide with a Si atom and that collision generates a quantity of photons proportional to the number flux of incoming neutrons
Data Source
AI summary
Fast neutron detectors using nuclear reactions within semiconductor material, glass, or other material. Some versions used doped versions of the materials. Some versions use dopants selected from Ba, As, Br, C, Ce, Cl, Co, Cu, F, Ga, Ge, In, Cd, Te, Al, P, K, La, Mo, Nd, O, Os, Pr, S, Se, Si, Sn, Sr, Ti, Tl, V, Zn, and Zr. Some versions have filters or coatings deposited on windows into the detector. Coatings are selected from titanium oxide, zinc oxide, tin oxide, copper indium gadolinium selenide, cadmium telluride, cadmium tin oxide, perovskite photovoltaic, Si, GaAs, AlP, Ge.