Isp Investments Inc.

Gaf Corporation

Gaf Chemicals Corporation

Combustion Equipment Associates, Inc.

York Research Corp.

David F Lewis

Carl A Listl

Xiang Y Yu

Robert D Schenfele

J Michael Donahue

John C Hornby

Mark L Moskowitz

Henry Seiwatz

Steward E Purdy

Kou-Chang Liu

Thomas Winkler

Hsiao-Yi Shih

Andre Micke

Sangya S Varma

Norman A Lyshkow

Sotiri A Papoulias

James R Kuszewski

Janette Anyumba

Guojin Lu

Anthony Pilato

Edward J Kaplin

Loris Menegotti

Anna Delana

Xiang Yu

Yu Xiang

Micke Andre

The present invention provides a method for measuring a two-dimensional distribution of ionizing radiation doses with high spatial resolution. The method comprises exposing radiation sensitive film to a pattern of ionizing radiation to form a measurement film, exposing areas of radiation sensitive film to a plurality of known doses of the ionizing radiation to form a calibration film(s), scanning all the exposed films together with an unexposed radiation sensitive film at a single time to produce a digital image, measuring those areas of the digital image corresponding to the unexposed film and the calibration film(s) exposed to different known doses, associating the measured responses in the areas to the known doses and using the association to convert the values in the scanned image corresponding to the measurement film from scanner response values to dose values. In a preferred embodiment, all of the radiation sensitive films are the same type of film.

Efficient method for radiochromic film dosimetry

A radiation dosimetry method and associated devices for carrying out the method are disclosed herein. More particularly, a method and associated apparatus which compensates for variations in amounts of a radiation sensitive material in a radiation dosimetry film is provided.

Radiation dosimetry method

A radiation-sensitive material comprising a support and a radiation sensitive composition on the support is disclosed, wherein the radiation sensitive composition includes a dispersion containing nanoparticles of a sensitizer.

Nanoparticle dispersion to improve radiation sensitivity

In accordance with the present invention, there is provided a method for removing the effect of light scattering in a digitized image of a light-scattering film comprising providing a light-scattering correction film that has a uniform optical density; providing a light scattering target film that has a pattern of optical densities; scanning the correction film with a film scanner to create a digital correction film image; scanning the target film with a film scanner to create a digital target film image; measuring the two-dimensional pattern of responses present in the digital correction film image; determining a correction function from the two-dimensional pattern of responses to correct for the effect of light scattering in the digital correction film image; and applying the correction function to the target film image to provide a corrected target film image.

Method for removing the effect of light scattering in a digitized image of a light-scattering film

The present invention is a reactive bar-code element which is unreadable prior to irradiation and readable after irradiation.

Human and scanner readable radiation exposure indicator with reactive barcode

An article of manufacture comprising a radiation sensitive material, and a measuring scale that is part of the radiation sensitive material. A method of measuring at least one parameter relating to an irradiated material is also described. A radiation sensitive material including a measuring scale is exposed to radiation and at least one parameter relating to one or more exposed areas of the material is measured by reference to the measuring scale on the material.

Radiation sensitive film including a measuring scale

Dosimeter badge

This invention relates to photochromic filaments composed of the lithium salt of a conjugated, polymerizable polyacetylene having a carboxylic acid or carboxylate terminal group wherein the length to width ratio of said filaments is between about 5000:1 and about 5:1 and the average length of the filament is up to about 5 cm. The invention also pertains to the use of said salts in maximized radiation sensitivity for imaging, radiation dose measurement or mapping and detection of radiation fields.

Lithium salt of polyacetylene as radiation sensitive filaments and preparation and use thereof

A method for calibrating a radiation detection medium by exposing arbitrary locations of a radiation detection medium to a plurality of known radiation dose levels is described. One particular aspect of the method includes the steps of automatically determining the location of each arbitrary exposed location, measuring the density of each of the arbitrary exposed locations, matching each measurement for the arbitrary exposed locations with the corresponding radiation dose level thereby generating an array of paired data values for radiation dose level and measured density and calculating a calibration based on the array of paired data values.

Method for calibrating a radiation detection medium

A method and associated apparatus for monitoring exposure to radiation, with compensation for temperature variation of a sensor and variations in the amount of radiation sensitive material in a dosimeter used in the method. The method utilizes a radiation dosimeter having a layer of radiation sensitive material on a substrate, the radiation sensitive material having an optical absorbance which varies in accordance with degree of radiation exposure and wavelength and which also varies in dependence on temperature. The radiation sensitive layer includes a substantially radiation impervious substance. The method comprises exposing the layer of radiation sensitive material to a dose of radiation, optically measuring a spectral absorbance of the exposed layer of radiation sensitive material within a range of wavelengths, examining the measured spectral absorbance of the exposed layer of radiation sensitive material to determine an absorbance coordinate and a wavelength coordinate of a predetermined point on a spectral absorbance curve of the exposed layer of radiation sensitive material, and determining a radiation dose value associated with the absorbance coordinate and the wavelength coordinate. Generally, the radiation dose value is determined by consulting a table of absorbance and wavelength coordinates with associated dose values which have been previously measured for a batch of the radiation sensitive material, the batch having a uniform absorbance coefficient and a common concentration of the radiation sensitive material. The method can automatically compensate for variations in the amount of radiation sensitive material by adjusting the absorbance value of the radiation sensitive material by a measured value of absorbance in the radiation impervious substance.

Radiation dosimetry method and associated apparatus

In a method for manufacturing a calibrated radiation dosimeter, a layer of radiation sensitive material is applied to a substrate, the radiation sensitive material having an optical density which varies in accordance with a degree of radiation exposure. A pre-exposure optical density of the layer of radiation sensitive material is optically measured and subsequently the layer of radiation sensitive material is exposed to a known dose of radiation. Thereafter, a post-exposure optical density of the layer of radiation sensitive material is optically measured. Using at least the pre-exposure optical density, the post-exposure optical density, and the known dose of radiation, one computes mathematical parameters defining a predetermined mathematical function. The computed mathematical parameters are applied in encoded form to the substrate (e.g., printed in bar code form on the substrate or a holder card).

Method for manufacturing calibrated radiation dosimeter

This invention relates to a mixture of imageable polyacetylenic compounds which have similar photosensitivities and which are visually imageable in complementary colors combinable to provide a black image, which mixture contains at least one polyacetylenic metal salt which produces a color, preferably a metal salt of a diacetylene C,to C,mono- or dicarboxylic acid, which is complementary to a color produced by another polyacetylenic metal salt or non-metallic polyacetylenic compound contained in the mixture or in an another integral color forming layer. The invention also pertains to the use of said mixture and the manner of its preparation.

Processless diacetylenic salt films capable of developing a black image

A method for determining a level of exposure to radiation utilizes a radiation dosimeter comprising a substrate provided with a radiation sensitive layer or patch having an optical density which varies in accordance with the degree of radiation exposure. In addition, the substrate is provided with optically readable coding which identifies one or more encoded mathematical parameters for enabling an automated calculation of dosage from a detected optical density change of the radiation sensitive material. In the method, the coding on the dosimeter substrate is scanned to automatically determine the encoded mathematical parameters, and a plurality of pre-exposure optical densities and a plurality of post-exposure optical densities of the layer of radiation sensitive material in a plurality of wavelength bands are optically measured. From these quantities, a quantitative radiation dose to which the layer of radiation sensitive material was exposed is automatically computed in accordance with a predetermined mathematical algorithm. Each dosimeter is provided with a unique identification code encoded in the bar coding on the dosimeter substrate, to enable memory storage of pre-exposure optical densities for multiple dosimeters.

Growing community of inventors

Monroe, CT, United States of America

David F Lewis