The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1996
Filed:
May. 17, 1994
Riad A Tawil, Kirtland, OH (US);
Philip M Pontikos, Warren, OH (US);
Kenneth J Velbeck, Sagamore Hills, OH (US);
Joseph E Rotunda, Cuyahoga Falls, OH (US);
Saint Gobain/Norton Industrial Ceramics Corp., Worcester, MA (US);
Abstract
A dosimeter product that simplifies the process of dosimetry in medical diagnosis, therapy and other fields where high precision is needed. The dosimeter product is obtained by a unique training method which stabilizes the sensitivity of the dosimeter. Stability in sensitivity is established by a combination of high temperature cyclical annealing and low temperature furnace annealing. After the sensitivity of the dosimeters is stabilized, the dosimeters are then calibrated by generating for every dosimeter within a group element correction coefficients (ECCs) that compensate for the differences in sensitivity among the group of the dosimeters, bringing the sensitivity of each dosimeter to the sensitivity of the mean of the population. The result is a group of precalibrated dosimeters with stable sensitivity that are ready to use with established correction factors for individual TL response differences. This eliminates, among other things, the need for the end user to track individual dosimeters and to maintain annealing furnaces and fixtures. The dosimeters may be used to perform radiation dosimetry wherein the dosimeters are exposed to radiation after which the TL response of the dosimeter is read out. Accordingly, there is provided a dosimetry system comprising a dosimeter produced in accordance with the invention and a TLD reader for reading the TL response of the dosimeter. Also provided are an annealing tray and holder assembly useful in carrying out the method of the invention, a quench block and a storage case.