Radiation Detector Stacked Body Neutron Sensitivity
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Solution Overview
Problem
Current radiation detectors face challenges in achieving high sensitivity for neutron detection while minimizing sensitivity to gamma rays, as inorganic scintillators enhance neutron sensitivity but also increase gamma-ray detection, making it difficult to detect neutrons effectively.
Innovation Solution
A radiation detector design featuring a stacked body with a first scintillator layer, a conductive layer, and an organic semiconductor layer, where the organic semiconductor layer includes elements like boron or lithium, which generates charged particles from neutrons, and the thickness of the scintillator and organic semiconductor layers are optimized to enhance neutron detection while reducing gamma-ray sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inorganic scintillators are used to enhance neutron sensitivity, then neutron detection sensitivity is improved, but gamma-ray detection sensitivity increases, making it difficult to detect neutrons effectively
Solution Approach 1:
The detector is segmented into multiple functional layers: an organic semiconductor layer for neutron detection, a first scintillator layer for converting charged particles to light, and a second scintillator layer for gamma-ray detection. This segmentation allows independent optimization of each layer's function, enabling high neutron sensitivity while managing gamma-ray sensitivity through the specific design of the second scintillator layer.
Solution Approach 2:
The invention uses composite material structures combining organic semiconductors with specific neutron-absorbing elements (boron, lithium, gadolinium, helium) and scintillator materials. This composite approach allows the organic semiconductor layer to selectively detect neutrons while the scintillator layers handle light conversion, achieving high neutron sensitivity without proportionally increasing gamma-ray detection.
2Measurement precision
If the thickness of the scintillator layer is increased to improve neutron detection, then neutron detection capability is enhanced, but gamma-ray sensitivity also increases
Solution Approach 1:
Different regions of the detector have specialized qualities optimized for their specific functions. The organic semiconductor layer contains neutron-absorbing elements at specific locations to maximize neutron detection. The first scintillator layer is positioned and sized to convert charged particles from neutron interactions. The second scintillator layer is specifically configured to detect gamma rays. This local quality differentiation allows the detector to achieve high neutron sensitivity without proportionally increasing gamma-ray sensitivity.
Solution Approach 2:
The invention transitions from a single-layer detector to a multi-layer stacked structure, adding the dimension of layering. This dimensional change allows simultaneous optimization for both neutron and gamma-ray detection by assigning different functions to different layers. The organic semiconductor layer handles neutron detection, the first scintillator layer converts charged particles to light, and the second scintillator layer detects gamma rays, resolving the contradiction between neutron sensitivity and gamma-ray sensitivity.
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
This configuration allows for increased sensitivity to neutrons while maintaining low sensitivity to gamma rays, enabling accurate detection of neutrons even when both are present, by appropriately setting the thickness of the scintillator and organic semiconductor layers.
Implementation Method 1
the organic semiconductor layer includes a first element that generates charged particles by reacting with radiation incident on the organic semiconductor layer
Implementation Method 2
a first scintillator layer... provided between the radiation incident surface and the first conductive layer
Data Source
AI summary
According to one embodiment, a radiation detector includes a stacked body. The stacked body includes a first scintillator layer, a first conductive layer, a second conductive layer and an organic semiconductor layer. The second conductive layer is provided between the first scintillator layer and the first conductive layer. The organic semiconductor layer is provided between the first conductive layer and the second conductive layer. The organic semiconductor layer includes a first element. The first element includes at least one selected from the group consisting of boron, gadolinium, helium, lithium, and cadmium.