Transparent Neutron Conversion Foil for Efficient Light Collection
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Solution Overview
Problem
Current neutron detection technologies are complex and require improvement in efficiency, necessitating a simpler and more effective method for detecting neutrons.
Innovation Solution
A neutron-detecting device utilizing optically transparent neutron conversion foils with a neutron conversion layer made of Li-6 or B-10, coated on both sides of a substrate, and an overlying wavelength shifting layer, allowing light from neutron capture to be collected and detected by a light-sensing device, combined with a scintillation volume filled with noble gases for simultaneous measurement of neutrons and gamma radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional neutron detection methods are used, then neutron detection is possible, but the device complexity is high and detection efficiency is insufficient
Solution Approach 1:
The patent combines the neutron conversion function and light emission function into a single integrated conversion layer, eliminating the need for separate conversion foils and light guides. This merging of functions reduces device complexity while maintaining or improving neutron detection efficiency, as the integrated structure allows direct light collection from neutron capture events.
Solution Approach 2:
The patent employs composite materials in the conversion layer, combining neutron-capturing materials (such as lithium-6 or boron-10) with phosphor materials that emit light upon neutron capture. This composite approach enhances neutron detection efficiency by ensuring both effective neutron absorption and efficient light generation within the same layer, while the material composition can be optimized to simplify the overall device structure.
2Measurement precision
If light collection is improved for neutron detection, then detection sensitivity increases, but device structure becomes more complex
Solution Approach 1:
By merging the conversion layer and light guide into a single integrated structure, the patent eliminates the need for complex light collection optics and multiple components. The integrated conversion layer directly emits light toward the photodetector, simplifying the optical path and reducing structural complexity while improving light collection efficiency and detection sensitivity.
Solution Approach 2:
The patent introduces a wavelength-shifting layer as an intermediary between the neutron conversion layer and the photodetector. This layer converts the light wavelength to match the photodetector's optimal detection range, enhancing detection sensitivity without requiring complex optical filtering or selection systems, thus maintaining structural simplicity.
Data Source
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AI summary
A neutron conversion foil (10') for being used in a neutron detector comprises a substrate (11) having a first and second side, whereby said substrate (11) is covered at least on one of said first and second sides with a neutron conversion layer (12, 12') made of a neutron reactive material and being capable of capturing neutrons to thereafter emit light and/or charged particles, whereby said neutron conversion foil (10') is transparent to light such that light (16, 16') originating from the conversion of neutrons can pass through one or several of said neutron conversion foils (10') and thereafter be collected and detected by a light sensing device.