2D Directional Gamma Ray Detector Using Scintillator Arrays
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Solution Overview
Problem
Current directional radiation detectors have limited two-dimensional directionality, requiring iterative rotations and multiple systems, which are time-consuming and inefficient for detecting shielded nuclear materials.
Innovation Solution
A directional detector system with a panel scintillator and rod scintillators, configured to determine gamma ray and neutron source direction in two dimensions using a single data set acquired at a single orientation, incorporating a shield to enhance angular resolution and detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative rotations are used to determine source direction, then directional accuracy is improved, but detection time increases significantly
Solution Approach 1:
The patent transitions from one-dimensional rotational scanning to two-dimensional simultaneous detection by arranging scintillators in a planar configuration. The detector array captures radiation from multiple azimuthal angles and polar angles concurrently, eliminating the need for iterative rotations while maintaining directional accuracy through geometric arrangement and coincidence counting logic.
Solution Approach 2:
The detector is divided into multiple segmented scintillator elements arranged in a two-dimensional array. Each scintillator segment independently detects radiation events, and the system uses coincidence counting between segments to determine both azimuthal and polar angles simultaneously. This segmentation enables parallel detection across multiple directions without requiring mechanical rotation.
2Adaptability or versatility
If multiple separate detection systems are used for horizontal and vertical scanning, then comprehensive directional coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges horizontal and vertical detection capabilities into a single integrated detector array. Multiple scintillator elements are arranged in a two-dimensional configuration where each element contributes to both azimuthal and polar angle determination. This unified system eliminates the need for separate horizontal and vertical scanning systems, reducing mechanical complexity while maintaining comprehensive directional coverage through simultaneous multi-angle detection.
3Device complexity
If a single detector system performs both horizontal and vertical scanning, then device simplicity is improved, but detection speed decreases
Solution Approach 1:
The patent enables continuous simultaneous detection in both horizontal and vertical dimensions through the two-dimensional scintillator array. Unlike sequential scanning systems that alternate between horizontal and vertical measurements, this system continuously captures radiation events from all directions at once. The coincidence counting logic processes all angular information in parallel, maintaining high detection speed while using a single simplified detector structure.
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 rapid, efficient localization of radiation sources in two dimensions, improving detection sensitivity and reducing scan times, while maintaining compactness and low cost.
Implementation Method 1
Gamma rays are detected when they interact with matter via photoelectric absorption in which the gamma ray is absorbed and a photoelectron is emitted
Implementation Method 2
Compton scattering which generates a Compton electron and a scattered gamma ray
Implementation Method 3
electron-positron pair production
Implementation Method 4
Fast neutrons can be detected by neutron-proton elastic scattering in which the recoil proton passes through a detector such as a scintillator
Implementation Method 5
Slow or low-energy neutrons (1 eV or less, also called thermal or epithermal) are detected by a capture reaction in a neutron-capture nuclide, usually 10B or 6Li, causing emission of prompt ions such as alpha and triton particles
Implementation Method 6
the energetic electron (or positron, treated as an electron herein) can be detected in a charged-particle detector such as a scintillator
Data Source
AI summary
Disclosed is a directional gamma ray or neutron detector that locates a source both horizontally and vertically. In some embodiments, the detector comprises four “rod” scintillators around a shield, and an orthogonal “panel” scintillator mounted frontward of the rod scintillators. The azimuthal angle of the source may be calculated according to the detection rates of the rod scintillators, while the polar angle of the source may be calculated from the panel scintillator rate using a predetermined angular correlation function. Thus, the exact location of the source can be found from a single data set without iterative rotations. Embodiments of the detector enable rapid detection and precise localization of clandestine nuclear and radiological weapons in applications ranging from hand-held survey meters and walk-through portals, to vehicle cargo inspection stations and mobile area scanners. Such detectors are needed to detect clandestine nuclear weapons worldwide.