Soil Sorting System with Radiation Detector Array
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Solution Overview
Problem
The increasing cost of nuclear waste disposal and the need to segregate contaminated soil from clean soil to reduce the volume of waste requiring long-term storage, as existing methods are inefficient in handling heterogeneous soil with both clean and contaminated portions.
Innovation Solution
A system for surveying and sorting feed material, such as soil, using a detector array to identify radioactive isotopes and other contaminants, which separates contaminated portions from uncontaminated ones, allowing for efficient diversion and storage of clean soil, and potentially other types of debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all excavated soil is treated as contaminated and disposed of in landfills, then disposal safety is ensured, but disposal costs increase and landfill capacity is consumed faster
Solution Approach 1:
The system segments contaminated soil from clean soil using detector arrays that identify radioactive isotopes and divert contaminated portions to disposal while allowing clean portions to be reused, thereby reducing the total volume of waste requiring landfill disposal
Solution Approach 2:
The patent replaces manual sampling and visual inspection with automated detector arrays that use radiation detection physics to identify contaminated soil, enabling real-time automated diversion decisions without mechanical handling of all soil
2Device complexity
If manual sampling and analysis methods are used to identify contaminated soil, then equipment complexity is reduced, but productivity and sorting accuracy decrease
Solution Approach 1:
Manual sampling and laboratory analysis are replaced with in-situ radiation detection using scintillation detectors and semiconductor detectors that provide immediate identification of contaminated soil, enabling real-time automated sorting at high speeds
Solution Approach 2:
The system performs self-diagnosis and automated decision-making through control systems that process detector signals and operate diversion mechanisms without human intervention, maximizing productivity while minimizing operational complexity
3Ease of operation
If homogeneous treatment is applied to all excavated material, then processing simplicity is maintained, but waste volume increases due to inclusion of clean soil
Solution Approach 1:
The system automatically segments the homogeneous soil stream into contaminated and clean portions based on real-time radiation detection, diverting contaminated material to disposal and allowing clean material to be reused, thereby reducing waste volume without complicating processing
Solution Approach 2:
The system monitors radiation level parameters continuously and uses these changes to trigger automated diversion decisions, transforming a simple homogeneous processing flow into a differentiated stream that reduces waste volume while maintaining operational simplicity
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 reduces the volume of waste needing disposal by accurately segregating contaminated and clean materials, thereby lowering disposal costs and addressing the challenge of closed landfills, while being mobile and easily assembled for on-site use.
Implementation Method 1
A system for surveying and sorting feed material, such as soil, using a detector array to identify radioactive isotopes
Data Source
AI summary
A sorting system for use with a feed material. The system includes a detector system, a control system, a diversion system, and a material transport mechanism. The material transport mechanism is configured to transport the feed material to the diversion system past the detector system. The detector system is operable to detect a level of a contaminant in the feed material transported past the detector system and transmit a signal to the control system indicating the level. The control system is operable to instruct the diversion system to deposit the feed material in a first area when the level exceeds predefined release criteria, and to deposit the feed material in a second area when the level does not exceed predefined release criteria. The feed material may include soil, concrete rubble, masonry rubble, ore, ash, metallic shapes, metallic scraps, and vegetable matter.