Segmented Shielding Barrel for Slow Neutron Energy Spectrum Measurement
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Solution Overview
Problem
Current methods for slow neutron detection cannot distinguish the incident energy of slow neutrons, limiting their ability to obtain a finer neutron energy spectrum, which is crucial for various scientific applications such as space radiation environment measurement and planetary soil composition analysis.
Innovation Solution
A structure for slow neutron detection comprising a shielding barrel and a detector unit, where the shielding barrel is designed to block neutrons with specific energy ranges, and the detector unit is positioned to measure the slow neutron depth distribution spectrum, allowing for the differentiation of slow neutron flux with different energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nuclear reaction detection method is used with elements like 10B, 6Li, 3He, then slow neutron flux can be detected, but the incident energy of slow neutrons cannot be distinguished
Solution Approach 1:
The shielding barrel is divided into multiple segments along the neutron incidence direction, with each segment having a specific thickness designed to block neutrons of specific energy ranges. This segmentation allows the detector to measure neutron flux at different depths, which corresponds to different energy ranges, thereby resolving the energy spectrum of slow neutrons while maintaining reliable detection.
2Measurement precision
If shielding barrel with specific thickness is used to block neutrons of specific energy ranges, then energy spectrum measurement is enabled, but device complexity increases
Solution Approach 1:
The shielding barrel serves multiple functions: it blocks neutrons of specific energy ranges, provides structural support for the detector, and defines the measurement geometry. By integrating these functions into a single component, the device complexity is minimized while still achieving energy spectrum measurement capability.
Solution Approach 2:
The detector is positioned inside the shielding barrel, with the barrel enclosing the detector along the neutron incidence direction. This nested configuration allows the shielding structure to protect and define the detector's measurement environment while enabling energy-dependent neutron flux measurement at different depths.
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 proposed structure effectively measures and distinguishes the slow neutron flux with different energies, providing a reliable method for obtaining the slow neutron energy spectrum, which is essential for improving the accuracy of scientific measurements in various fields.
Implementation Method 1
a shielding barrel, which is configured as a square with an opening... the shielding barrel is a square barrel made of Gd, and the thickness of the shielding barrel wall is 1 mm to block neutrons with energy
Implementation Method 2
the shielding barrel is a square barrel made of aluminum-based boron carbide with a boron carbide content of 40%, and the thickness of the shielding barrel wall is 5 mm to block neutrons with energy
Data Source
AI summary
The present disclosure belongs to the technical field of neutron detection, and it relates to a structure for slow neutron detection and a method for energy spectrum measurement of slow neutrons, wherein the structure for slow neutron detection comprises: a shielding barrel, which is configured as square with an opening; and a detector unit, which is a slow neutron detector with position resolution function, wherein the detector unit is completely wrapped in the shielding barrel, and the detector unit is placed close to one of the sides of the shielding barrel that is perpendicular to the open side of the shielding barrel. When the structure for slow neutron detection moves at a set speed, the incident energy spectrum of slow neutrons can be inversely extrapolated on the basis of the number of slow neutrons at different depths.