Detector for a uv false positive radiation sensitive devices

Abstract

Disclosed is a detector for monitoring a UV false positive from genuine X-ray positive of color developing radiation sensitive devices. A layer which can be scratched off and is opaque to undesired radiation but transparent to X-ray is printed on the sensor. If the sensor displays a signal (i.e., develops color), whether it is genuine or false positive can be confirmed by scratching off the opaque layer. If the signal is a genuine positive, the whole sensor will be uniformly exposed/colored including the area under the opaque layer. If it is a false positive, the area under the scratched off layer will be of lighter color than the rest of the sensor.

1 . A radiation sensitive, color developing device for monitoring high energy radiation comprising:
 a sensor capable of changing optical density wherein said optical density is proportional to a dose of said high energy radiation;   a transparent layer over said sensor;   a removable opaque layer over a portion of said sensor.   
     
     
         2 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  wherein said opaque layer is printed on one layer selected from said sensor and said transparent layer. 
     
     
         3 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  wherein said removable opaque layer is applied with an adhesive. 
     
     
         4 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 3  wherein said removable opaque layer is printed or coated. 
     
     
         5 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  wherein said opaque layer is opaque to UV and visible light. 
     
     
         6 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  wherein said opaque layer is transparent to high energy ionizing radiation. 
     
     
         7 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 5  wherein said high energy radiation is selected from X-ray, electrons and neutrons. 
     
     
         8 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  where radiation sensitive material is a diacetylene. 
     
     
         9 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  wherein said removable opaque layer is removable by scratching. 
     
     
         10 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 1  wherein said removable opaque layer is removable by a solvent. 
     
     
         11 . A radiation sensitive, color developing device for monitoring high energy radiation comprising:
 a sensor capable of changing optical density wherein said optical density is proportional to a dose of said high energy radiation;   a transparent layer over said sensor;   a removable opaque layer over a portion of said sensor; and   at least one indicator selected from a thermal indicator, an aging indicator, a shelf life indicator, an internal indicator and a physical tampering indicator.   
     
     
         12 . The radiation sensitive, color developing device for monitoring high energy radiation of  claim 11  wherein said indicator is selected from at least one of deformations, bends, curls, expansion, contraction, softening, hardening, brittleness, cracking, weakening, strengthening, changes in smoothness or roughness, drying out, diffusion or migration of chemicals and additives, reaction among and between additives and binders, diffusion of ambient environment/chemicals including water and water vapor, de-coloration, color development, color changes, and a photo reaction. 
     
     
         13 . A process for detecting and distinguishing an effect of high energy radiation and low energy radiation comprising:
 preparing a sensor capable of changing optical density when exposed to high energy radiation and low energy radiation;   attaching a protective layer over said sensor wherein said protective layer is transparent to both said high energy radiation and said low energy radiation;   attaching a removable layer to one of said sensor or said protective layer wherein said removable layer covers a portion of said sensor and is opaque to said low energy radiation and transparent to said high energy radiation thereby forming a layered sensor;   radiating said layered sensor with a first dose of high energy radiation and a second dose low energy radiation to form a first density area on said sensor corresponding to an area covered by said removable layer and a second density area corresponding to an area not covered by said removable layer; and   removing said removable layer and measuring a first density in said first density area wherein said first density is correlated to said first dose.   
     
     
         14 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  further comprising:
 measuring a second density in said second density area wherein said second density is correlated to said second dose. 
 
     
     
         15 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  where said removable layer is removable by scratching. 
     
     
         16 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  wherein said removable layer is removable by a solvent. 
     
     
         17 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  wherein said sensor comprises a diacetylene. 
     
     
         18 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  wherein said density is a color density. 
     
     
         19 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  further comprising a color chart correlating said first density to said first dose. 
     
     
         20 . The process for detecting and distinguishing an effect of high energy radiation and low energy radiation of  claim 13  wherein said first density is determined by at least one method selected from visually comparing with the color reference chart, optical densitometer and spectrophotometer. 
     
     
         21 . A process for detecting and distinguishing an effect of high energy radiation and low energy radiation comprising:
 preparing a sensor capable of changing optical density when exposed to high energy radiation and low energy radiation;   attaching a protective layer over said sensor wherein said protective layer is transparent to both said high energy radiation and said low energy radiation;   attaching a removable layer to one of said sensor or said protective layer wherein said removable layer covers a portion of said sensor and is opaque to said low energy radiation and transparent to said high energy radiation thereby forming a layered sensor;   radiating said layered sensor with a first dose of high energy radiation and a second dose low energy radiation to form a first density area on said sensor corresponding to an area covered by said removable layer and a second density area corresponding to an area not covered by said removable layer; and   removing said removable layer and measuring a first density in said first density area wherein said first density is correlated to said first dose wherein said sensor further comprises at least one indicator selected from thermal indicator, an aging indicator, a shelf life indicator, an internal indicator and a physical tampering indicator.   
     
     
         22 . The process for detecting and distinguishing a positive signal from a false positive signal of  claim 21  wherein said indicator comprises at least one selected from observable deformation, bending, curling, expansion, contraction, softening, hardening, brittleness, cracking, weakening, strengthening, change in smoothness or roughness, drying out, diffusion or migration of chemicals and additives, reaction among and between additives and binders, diffusion of ambient environment/chemicals including water and water vapor, de-coloration, color development, color changes and a photo reaction. 
     
     
         23 . A process for detecting and distinguishing a positive signal from a false positive signal comprising:
 preparing a sensor capable of changing optical density when exposed to high energy radiation and low energy radiation;   attaching a protective layer over said sensor wherein said protective layer is transparent to both high energy radiation and low energy radiation;   attaching a removable layer to one of said sensor or said protective layer wherein said removable layer covers a portion of said sensor and is opaque to said low energy radiation and transparent to said high energy radiation thereby forming a layered sensor;   radiating said layered sensor with a first dose of high energy radiation and a second dose low energy radiation to form a first density area on said sensor corresponding to an area covered by said removable layer and a second density area corresponding to an area not covered by said removable layer;   removing said removable layer;   measuring a first density in said first density area wherein said first density is correlated to said first dose and if said first dose is above a predetermined threshold a positive signal is indicated; and   measuring a second density in said second density area wherein said second density is correlated to said second dose and if said second dose is above a predetermined threshold a false positive signal is indicated.   
     
     
         24 . The process for detecting and distinguishing a positive signal from a false positive signal of  claim 23  wherein one of said one first density and said second density is determined by a method selected from visually comparing with a color reference chart, optical densitometer and spectrophotometer. 
     
     
         25 . The process for detecting and distinguishing a positive signal from a false positive signal of  claim 23  where radiation sensitive material comprises a diacetylene. 
     
     
         26 . The process for detecting and distinguishing a positive signal from a false positive signal of  claim 23  wherein said sensor further comprises a thermal indicator, an aging indicator, a shelf life indicator, and physical tampering indicator. 
     
     
         27 . The process for detecting and distinguishing a positive signal from a false positive signal of  claim 23  further comprising at least one indicator selected from deformation, bending, curling, expansion, contraction, softening, hardening, brittleness, cracking, weakening, strengthening, change in smoothness or roughness, drying out, diffusion or migration of chemicals and additives, reaction among and between additives and binders, diffusion of ambient environment/chemicals including water and water vapor, de-coloration, color development, color changes and photo reaction.