Chromotropic detection of ionizing radiation

Patent metadata

Field	Value
Publication number	US-9971038-B2
Application number	US-201414777034-A
Country	US
Kind code	B2
Filing date	Mar 13, 2014
Priority date	Mar 15, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A high contrast dosimeter is constructed where a plastic support is at least partially coated with a layer having a colored radical trapping compound. The plastic is a polymer that can contain a radiation sensitive plasticizer. The plastic forms radicals upon irradiation with high-energy (low wavelength) radiation. Upon diffusion of the radicals to the layer of radical trapping compound, reaction forms a compound with a different color than the radical trapping compound. In an embodiment of the invention, the plastic support is celluloid and the radical trapping compound is an azulenyl nitrone (AZN).

First claim

I claim:

1. A high-energy radiation dosimeter, comprising:
at least one plastic support comprising a radiation sensitive polymer and/or a polymer comprising at least one radiation sensitive plasticizer; and
an indicator layer comprising a radical trapping compound on at least a portion of the plastic support, wherein the radiation sensitive polymer and/or the radiation sensitive plasticizer forms a diffusible radical upon irradiation with electromagnetic radiation having a wavelength less than 10 nm, wherein the radical diffuses from the plastic support into the indicator layer and reacts with the radical trapping compound to indicate the presence of the diffusible radical formed by radiation.

2. The high-energy radiation dosimeter of claim 1 , wherein the radiation sensitive polymer is celluloid.

3. The high-energy radiation dosimeter of claim 1 , wherein the radical trapping compound is an azulenyl nitrone (AZN).

4. The high-energy radiation dosimeter of claim 3 , wherein the AZN is:

5. The high-energy radiation dosimeter of claim 1 , further comprising a diffusion barrier, where the diffusion barrier comprises a container, coating or laminate layer.

6. The high-energy radiation dosimeter of claim 1 , further comprising a filter layer wherein the filter layer blocks the transmission of UV radiation to the dosimeter.

7. The high-energy radiation dosimeter of claim 1 , further comprising a contrast layer, wherein the contrast layer resides on at least one portion of the plastic support other than the at least one portion having the layer comprising a radical trapping compound.

8. The high-energy radiation dosimeter of claim 1 , further comprising an adhesive layer.

9. The high-energy radiation dosimeter of claim 8 , wherein the adhesive is a pressure sensitive adhesive.

10. A method of preparing a dosimeter according to claim 1 , comprising:
providing a plastic support comprising a radiation sensitive polymer and/or a polymer comprising at least one radiation sensitive plasticizer, wherein the radiation sensitive polymer and/or the radiation sensitive plasticizer forms a diffusible radical upon irradiation with electromagnetic radiation having a wavelength less than 10 nm; and
coating at least a portion of the plastic support with a radical trapping compound to form an indicator layer.

11. The method of claim 10 , wherein the plastic support comprising the radiation sensitive polymer is celluloid.

12. The method of claim 10 , wherein the radical trapping compound is an AZN.

13. The method of claim 10 , wherein coating comprises dip-coating, spray-coating, roll-coating, painting, stamping, and ink jet printing.

14. A method of determining exposure to radiation, comprising:
providing a dosimeter according to claim 1 displaying one color;
exposing the dosimeter to an environment suspected of experiencing radiation less than 10 nm in wavelength; and
determining if the dosimeter differed in color from the color displayed before exposing.

15. The high-energy radiation dosimeter of claim 1 , further comprising a diffusion barrier covering the indicator layer distal to the plastic support.

Assignees

• The Florida International Univ Board Of Trustees

Inventors

• Becker David

Classifications

• B05D5/00

  Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures · CPC title

• B05D1/18

  performed by dipping · CPC title

• G01T1/06 Primary

  Glass dosimeters {using colour change; including plastic dosimeters} · CPC title

• G01T1/04 Primary

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

• B05D7/02

  to macromolecular substances, e.g. rubber (treatment or coating of shaped articles made of macromolecular substances C08J7/00) · CPC title