Direct Ion Storage Dosimeter with Integrated Communications
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Solution Overview
Problem
Direct ion storage (DIS) dosimeters are not widely used due to their laborious and expensive fabrication process, and the need for real-time data retrieval and communication in applications such as radiation detection and monitoring, which requires low-cost, easy-to-manufacture, and internet-connected dosimeters capable of handling multiple devices.
Innovation Solution
A simplified three-layer DIS dosimeter design using semiconductor processing techniques with a MOSFET structure and integrated communications interfaces, allowing for hermetic sealing and easy data readout, including USB and wireless connectivity, enabling real-time data transmission and monitoring of radiation exposure across multiple locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional DIS dosimeter fabrication process is used, then dosimeter functionality is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The dosimeter is divided into three separate layers (first layer with MOSFET, second layer with concavity, third layer with concavity) that are fabricated independently using standard semiconductor processing techniques and then bonded together. This segmentation allows each layer to be manufactured using automated processes rather than manual assembly, reducing both cost and complexity.
Solution Approach 2:
The patent combines the MOSFET structure with the ion chamber formation into a single integrated device where the floating gate serves dual purposes as both a transistor element and the ion collection surface. This merging eliminates the need for separate components and manual assembly steps.
2Productivity
If manual fabrication process is used, then dosimeter is produced, but production time and cost increase
Solution Approach 1:
By segmenting the dosimeter into three layers that can be fabricated separately using standard semiconductor processing, the patent enables automated batch production rather than manual one-at-a-time fabrication, significantly improving productivity.
Solution Approach 2:
The patent uses standard semiconductor processing parameters and techniques that are already optimized for high-volume automated production, allowing the dosimeters to be manufactured efficiently at scale rather than requiring specialized manual processes.
3Loss of time
If data retrieval requires physical handling, then dosimeter data is read, but time and resource consumption increase
Solution Approach 1:
The patent replaces the mechanical process of physical dosimeter handling and manual data reading with electronic data transmission through communication interfaces. Data is transmitted digitally through USB or wireless interfaces, eliminating the need for physical transport and manual intervention.
Solution Approach 2:
The dosimeter automatically transmits its data through integrated communication interfaces without requiring manual data extraction or physical handling, enabling self-service data retrieval that reduces time and resource consumption.
4Adaptability or versatility
If dosimeters are widely distributed, then monitoring coverage increases, but data collection and communication become more difficult
Solution Approach 1:
The patent integrates multiple communication interfaces (USB and wireless) into each dosimeter, making them universally compatible with various data collection systems and deployment scenarios. This multi-functionality allows the same dosimeter design to be used whether deployed locally or distributed widely, simplifying the overall data collection architecture.
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 solution enables cost-effective, efficient, and real-time radiation monitoring and detection systems, reducing the need for physical handling and transportation of dosimeters, and facilitating widespread deployment in applications like personal dosimetry and terrorist threat detection.
Implementation Method 1
Ionizing radiation incident on the air or gas produces charge carriers that recombine with and thereby change the charge on the gate
Data Source
AI summary
A direct ion storage (DIS) radiation detector or dosimeter has a design that is easy and low cost to manufacture using semiconductor processing techniques. The detectors include internal communications interfaces so they are easy to read. Different interfaces, including wired, e.g. USB ports, and wireless interfaces, may be used, so that the dosimeters may be read over the internet. The detectors can thus be deployed or used in a variety of detection systems and screening methods, including periodic or single time screening of people, objects, or containers at a location by means of affixed dosimeters; screening of objects, containers or people at a series of locations by means of affixed dosimeters, and surveillance of an area by monitoring moving dosimeters affixed to people or vehicles.