Coil System for In Vivo EPR Dosimetry of Teeth and Nails
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Solution Overview
Problem
Current methods for measuring radiation exposure using electron paramagnetic resonance (EPR) spectroscopy of fingernail clippings face interference from mechanically-induced signals (MIS), which obscure the radiation-induced signal (RIS), making it difficult to accurately determine recent radiation exposure, especially in mass casualty situations where rapid triage is necessary.
Innovation Solution
In vivo measurement of EPR signals from fingernails and teeth using devices with sensor loops or elastomeric cups to position resonators adjacent to the nails or teeth, eliminating mechanically-induced signals and allowing for direct detection of radiation-induced signals, which are then used to estimate whole-body radiation dose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EPR spectroscopy is performed on fingernail clippings to measure radiation exposure, then radiation-induced signals can be detected, but mechanically-induced signals from clipping interfere and obscure the radiation-induced signals
Solution Approach 1:
The patent extracts only the radiation-induced signal component from the total EPR signal by performing differential measurements. By comparing EPR spectra from irradiated and non-irradiated fingernail samples, the mechanically-induced signals are subtracted out, leaving only the radiation-induced signals for accurate dosimetry.
Solution Approach 2:
The patent introduces a control sample (non-irradiated fingernail clipping) as an intermediary reference. This control sample experiences the same mechanical clipping process but without radiation exposure, allowing the mechanically-induced signals to be identified and separated from the radiation-induced signals through differential analysis.
2Measurement precision
If EPR measurements are performed on multiple samples to improve accuracy, then measurement precision increases, but measurement time increases
Solution Approach 1:
The patent combines multiple measurements into a single integrated analysis framework. By simultaneously measuring both irradiated and non-irradiated samples and performing differential analysis, the method achieves high precision without requiring separate sequential measurements, thereby reducing total measurement time for triage applications.
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
This approach provides more accurate and rapid assessment of radiation exposure, enabling effective triage by distinguishing between different levels of radiation exposure, thereby prioritizing treatment for individuals in mass casualty situations such as nuclear attacks or accidents.
Implementation Method 1
Electron Paramagnetic Resonance Spectroscopy (EPR), sometimes known as Electron Spin Resonance Spectroscopy, takes advantage of this effect to quantify and determine environments of the unpaired electrons. This is done by applying a magnetic field to a substance, which may be located within a human or animal subject, to align spins of any unpaired electrons in the substance.
Implementation Method 2
This is done by applying a magnetic field to a substance, which may be located within a human or animal subject, to align spins of any unpaired electrons in the substance.
Data Source
AI summary
An apparatus and method for triaging patients according to radiation exposure operates by measuring electron paramagnetic resonance spectra of fingernails, toenails, and/or teeth. A coil structure allows in vivo measurement of tooth enamel or fingernail keratin with reduced coupling to underlying tissue.