Alternating Moderator Converter Layers for Simultaneous Neutron Gamma Detection
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Solution Overview
Problem
The use of 3He proportional counter tubes for neutron detection is limited due to the scarcity of 3He, necessitating the development of an alternative neutron detection method that does not rely on these tubes.
Innovation Solution
A detector comprising a cuboid detector crystal, alternating moderator layers made of polythene, and converter layers made of copper or iron, which moderate and react with neutrons to produce detectable gamma rays, allowing simultaneous neutron and gamma ray detection without the need for 3He tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 3He proportional counter tubes are used for neutron detection, then neutron detection capability is achieved, but material scarcity and high cost occur
Solution Approach 1:
The patent combines neutron moderation and conversion functions into a single integrated layer structure where moderator and converter materials are alternately arranged. This merging approach replaces the need for 3He tubes by creating a composite detection system that achieves neutron detection through gamma ray emission from the converter layer, resolving the contradiction between detection reliability and material availability.
Solution Approach 2:
The patent employs composite material structures with alternating moderator and converter layers, each serving specific functions. The moderator (e.g., polyethylene) slows down neutrons while the converter (e.g., 6Li-containing material) converts them to detectable gamma rays. This composite approach eliminates dependence on scarce 3He while maintaining effective neutron detection capability.
2Measurement precision
If separate neutron and gamma ray detectors are used, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The detector design achieves multi-functionality by enabling a single detection system to identify both neutron and gamma ray radiation types through energy spectrum analysis. The alternating moderator-converter layer structure produces characteristic gamma ray signals for neutrons while the detector crystal simultaneously detects gamma rays, allowing one system to perform multiple detection functions without requiring separate specialized detectors.
Solution Approach 2:
The patent merges neutron and gamma ray detection capabilities into a unified detector system. By analyzing the energy spectrum of detected gamma rays, the system can distinguish between neutrons (which produce gamma rays of specific energies through the converter layer) and direct gamma ray radiation, thereby achieving accurate multi-radiation detection with a single integrated device rather than multiple separate detectors.
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 solution provides a cost-effective and highly sensitive detection method with a broad application scope, utilizing readily available materials and achieving accurate differentiation between neutron and gamma ray counts based on energy analysis.
Implementation Method 1
a plurality of moderator layers, configured to moderate neutrons entering the moderator layer
Implementation Method 2
a plurality of converter layers, configured to react with said moderated neutrons to produce gamma rays
Implementation Method 3
a detector crystal, configured to detect incident gamma rays
Data Source
Figure 1~2
AI summary
The present invention discloses a detector. The detector includes a detector crystal, configured to detect incident rays therein; a plurality of moderator layers, configured to moderate neutrons entering the moderator layer; and a plurality of converter layers, configured to react with said moderated neutrons. The moderator layers and the converter layers are overlapped with each other, and the moderator layers and the converter layers are located outside the detector crystal.