Portable Neutron Gamma Spectrometer with PSD Detectors
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Solution Overview
Problem
Conventional neutron and gamma ray detection systems face challenges in accurately imaging and measuring neutrons and gamma rays due to their inherent properties, such as resistance to detection and difficulty in determining incident direction and energy, especially in the presence of background radiation or masking materials.
Innovation Solution
A portable and field-deployable system utilizing multiple layers of scintillation detectors with pulse shape discrimination (PSD) properties, arranged in parallel plates or rods, which detect and image neutrons and gamma rays by measuring interactions and time-of-flight between detectors to determine particle type and energy, allowing for precise localization and identification of sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional neutron detection techniques are used, then neutron detection is achieved, but directional information and energy measurement are lost or ambiguous
Solution Approach 1:
The detector is divided into multiple segments including a first detector for initial neutron interaction, a second detector for scattered neutron detection, and a third detector for additional interaction measurement. This segmentation allows reconstruction of neutron directional information and energy through multiple measurement points, resolving the information loss problem while maintaining detection precision.
Solution Approach 2:
The system transitions from single-dimension detection to multi-dimensional measurement by incorporating spatial positioning of multiple detectors and measuring parameters in different dimensions (position, energy, scattering angle). This enables simultaneous acquisition of directional information and energy measurement that were previously lost in conventional single-point detection.
2Measurement precision
If a double-scatter telescope is used to obtain directional and energy information, then measurement capability is improved, but device complexity and cost increase greatly
Solution Approach 1:
The system merges multiple detection functions into a single integrated detector assembly where the first, second, and third detectors work together as a unified system. This combination achieves double-scatter telescope capabilities for directional and energy measurement while reducing overall system complexity compared to separate specialized components.
Solution Approach 2:
The detector system performs multiple functions simultaneously: neutron detection, directional measurement, energy measurement, and particle identification. This multi-functionality eliminates the need for separate specialized instruments, reducing device complexity while maintaining comprehensive measurement precision.
3Measurement precision
If multiple detector types and configurations are used to achieve comprehensive measurement, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The system achieves comprehensive measurement by varying detection parameters (detector positioning, measurement timing sequences, energy thresholds) rather than using diverse detector types. This parameter-based approach maintains measurement precision while reducing device complexity compared to multi-type detector configurations.
4Ease of operation
If portable and field-deployable design is implemented, then ease of operation is improved, but measurement precision may be compromised
Solution Approach 1:
The detection system is designed with a nested structure where detector components are integrated within a compact housing that contains both neutron and gamma ray detection capabilities. This nested design achieves portability for field deployment while maintaining the multi-detector configuration necessary for precise measurement through space-efficient arrangement.
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 system effectively localizes sources of MeV neutrons and gamma rays with high angular resolution and sensitivity, capable of operating in environments with background radiation, and can detect neutrons and gamma rays in a compact, rugged, and cost-effective manner, overcoming limitations of previous technologies.
Implementation Method 1
a first plate and the second plate each carry a plurality of scintillation detectors, wherein each of the first plate and the second plate are contained within one of the two or more detector layer cases
Implementation Method 2
the electronic and processing unit determines the path of the neutron and/or gamma ray based on an interaction with one of the plurality of scintillation detectors on the first plate and an interaction with one of the plurality of scintillation detectors on the second plate
Implementation Method 3
the first plate and/or the second plate may use scintillation detectors having pulse shape discrimination (PSD) properties
Data Source
AI summary
A system of the present disclosure is capable of detecting, imaging and measuring both neutrons and gamma rays. The system may be portable and/or field deployable. The system may include two or more detector layer cases and a digital processing unit case. The system has a plurality of parallel plates each containing a plurality of detectors. The plates may have non-PSD organic scintillation detectors, scintillation detectors having pulse-shape discrimination (PSD) properties, and inorganic scintillation detectors. A first plate and a second plate are housed within detector layer cases. The scintillation detectors are used in connection to detect, image and measure neutrons and/or gamma rays.