Non-resonant electron spin resonant probe and associated hardware

Patent metadata

Field	Value
Publication number	US-11294075-B2
Application number	US-201816489974-A
Country	US
Kind code	B2
Filing date	Mar 2, 2018
Priority date	Mar 3, 2017
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A non-resonant ESR instrument/probe that can easily accept an identification card (or the like) form factor device incorporating a radiation sensitive material providing reliable and calibrated dose measurement stably and permanently stored into the device and deployed to individual, persons, animals, or objects, to act as a personal-surrogate dosimeter primarily in radiation mass events with radiation dose derived from a measure of the radiation induced changes in paramagnetic density obtained via transmission mode electron spin resonance measurements.

First claim

The invention claimed is:

1. An operational physical dosimetry system deployable as a retrospective public health counter measure comprising:
(a) individual devices usable for associating with a population of subjects to be protected, i.e. humans and animals, or inanimate objects, the devices being of identification card form factor to be carried on or associated with persons, animals or objects routinely or close in proximity, thereto to be easily accessed by a radiation status instrument,
(b) a radiation responsive variable characteristic material contained in or coated on or otherwise combined with each device and having properties of (1) immediate and stable preservation of a radiation exposure effect, changing characteristics of the material detectable by one or more types of radiation sensing instruments and (2) wherein the radiation variable material is responsive to incident radiation exposure in one or more bands of the electromagnetic spectrum to undergo a shift in measurable characteristics as a result of one or more exposures and retain a count of such shifts from such exposures cumulatively after the events,
(c) a radiation status measuring ESR instrument configured for operation in non-resonant mode for detecting predictable electron spin changes as a result of radiation to cumulatively measure quantity of radiation exposure,
(d) wherein the radiation status instrument is an ESR instrument configured for operation in a single ESR spectrum mode with opposing magnet poles configured to receive the devices and put a magnetic field through each such device and allow withdrawal and configured with a transmission line microwave probe with conducting surfaces mounted on the instrument and configured for excitation and detection operation and comprising coils to sweep and modulate magnetic fields across the radiation sensitive material of a device to be tested to establish and record a resonance spectrum.

2. The system of claim 1 wherein perforations or fissures are incorporated into the transmission line conducting surfaces to improve magnetic field modulation at higher frequencies.

3. The system of claim 1 wherein the variable characteristic of the radiation sensitive material is a paramagnetic free radicals content.

4. The system of claim 3 wherein the radiation sensitive material comprises L-alanine.

5. The system of any of claims 1 - 4 constructed and arranged to function with reliability exceeding 99% at clinically significant level of 2 Gy+/−0.5 Gy enabled by use of a stable crystalline structure immediately and permanently responsive in a linear response to ionizing radiation.

6. The system of claim 5 wherein a permanent magnet is provided in the ESR instrument.

7. A method of implementing a large scale radiation exposure measurements strategy comprising
(a) deploying to a population of subjects (person, animals and objects) to be served thereby devices of identification card form factor to carried on or otherwise physically associated with the subjects and accessible to a radiation status measuring instrument,
(b) the devices containing or having coated thereon or otherwise combined therewith a radiation responsive variable characteristic material contained in or coated on or otherwise combined with each device and having properties of (1) immediate and stable preservation of a radiation exposure effect, changing characteristics of the material detectable by one or more types of radiation sensing instruments and (2) wherein the radiation variable material is responsive to incident radiation exposure in one or more bands of the electromagnetic spectrum to undergo a shift in measurable characteristics as a result of one or more exposures and retain such shifts cumulatively after the events,
(c) deploying ESR radiation status measuring instruments configured for operation in a single ESR spectrum mode with magnet poles and configured with a transmission line microwave probe with conducting surfaces mounted on the instrument and configured for excitation and detection operation and comprising coils to sweep and modulate magnetic fields across the radiation sensitive material of a device to be tested to establish and record a resonance spectrum.

8. The method of claim 7 wherein perforations or fissures are incorporated into the transmission line conducting surfaces to improve magnetic field modulations at higher frequencies.

Assignees

• Global Resonance Tech Llc
• Government Of The Us Secretary Of Commerce

Inventors

• Campbell Jason
• Ryan Jason
• Cheung Kin
• Desrosiers Marc
• Gougelet Robert
• Shrestha Pragya

Classifications

• G01T1/02 Primary

  Dosimeters (G01T1/15 takes precedence) · CPC title

• G01T1/04 Primary

  Chemical dosimeters (G01T1/06, G01T1/08 take precedence) · CPC title

• G01N24/10

  by using electron paramagnetic resonance (G01N24/12 takes precedence) · CPC title

• G01T1/115

  Read-out devices · CPC title

• G01T7/00

  Details of radiation-measuring instruments · CPC title