Cellular Thermal Neutron Detector Using Boron Coating
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Solution Overview
Problem
Traditional thermal neutron detectors using 3He gas face a cost issue due to scarcity, necessitating the development of alternative detectors with higher efficiency and reduced manufacturing costs.
Innovation Solution
A thermal neutron detector featuring a cellular structure of hollow regular hexagonal prism-shaped units with a neutron-absorbing material coated on the inner pipe wall, an anode wire along the central axis, and a supporting frame for stability, eliminating the need for 3He and minimizing dead zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 3He proportional counters are used for thermal neutron detection, then detection efficiency is maintained, but manufacturing cost increases due to scarcity of 3He gas
Solution Approach 1:
The patent replaces expensive 3He gas with cheaper alternative materials (boron-coated straw tubes or multigrid structures with 10B, 155Gd, or 157Gd) that can be manufactured at lower cost while maintaining detection functionality. The cellular structure uses inexpensive materials arranged in a geometric pattern to achieve comparable detection efficiency without relying on scarce 3He isotopes.
Solution Approach 2:
The patent changes the nuclear reaction parameters by substituting 3He-based detection with boron or gadolinium-based detection. This involves changing the neutron absorption cross-section characteristics and reaction products (from 3He(n,p)3H to 10B(n,α)7Li or Gd(n,γ) reactions), thereby achieving cost reduction while preserving detection capability through different physical mechanisms.
2Ease of manufacture
If traditional neutron detector structures are used, then manufacturing process is simple, but dead zones are created affecting detection coverage
Solution Approach 1:
The patent divides the detector into multiple cellular units arranged in a hexagonal prism structure. Each cell acts as an independent detection element, and the segmented design eliminates dead zones by ensuring complete spatial coverage. The modular cellular structure allows neutrons to be detected from all directions without blind spots, while the individual cells can be manufactured separately and assembled systematically.
Solution Approach 2:
The patent transitions from traditional planar or linear detector arrangements to a three-dimensional cellular structure with hexagonal prisms stacked vertically. This dimensional change creates overlapping detection zones in multiple spatial dimensions, eliminating dead zones that would exist in two-dimensional arrangements while maintaining manufacturing feasibility through standardized cell replication.
3Ease of manufacture
If alternative nuclides (10B, 155Gd, 157Gd) are used to replace 3He, then manufacturing cost decreases, but detector structure complexity increases
Solution Approach 1:
The complex detection task is divided into multiple identical cellular units, each containing the neutron-absorbing material (boron coating or gadolinium-based components). This segmentation allows the complex functionality to be achieved through replication of simple, standardized modules rather than designing a single complex structure, making the overall system more manufacturable despite the sophisticated detection requirements.
Solution Approach 2:
The cellular structure serves multiple functions simultaneously: it provides the geometric framework for eliminating dead zones, holds the neutron-absorbing material (boron or gadolinium), provides structural support, and enables scalable manufacturing. This multi-functionality reduces the need for separate components, thereby managing structural complexity while achieving cost reduction through alternative nuclides.
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
Enables effective thermal neutron detection without 3He, reducing manufacturing costs and eliminating dead zones, while maintaining high detection efficiency through the use of boron-containing or gadolinium-containing materials.
Implementation Method 1
the thermal neutron measurement is based on some particular nuclear reactions
Implementation Method 2
high-energy charged particles should be produced, and a production probability P2 of the high-energy charged particles should be large, because only such high-energy charged particles can produce effective ionization and form useable signals
Data Source
AI summary
The present invention provides a cellular thermal neutron detector, comprising: a cellular structure comprised of one or more hollow regular hexagonal prism-shaped cellular units, wherein a neutron absorbing material is coated on an inner side of a pipe wall of each of the cellular units. Since the neutron-sensitive cellular structure is employed, the present invention can perform thermal neutron detection without using the scarce nuclide 3He, and effectively reduce the manufacture costs of the thermal neutron detector. Further, the present invention has characteristics such as a reduced or eliminated neutron detecting dead zone.