Device for noninvasively verifying thermoluminescent dosimeter card heater time temperature profile

Patent metadata

Field	Value
Publication number	US-10488275-B2
Application number	US-201615381690-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 16, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A non-invasive temperature verification system used in a TLD system, which comprises at least one thermal sensor, which is placed near each of TLD element, measuring its temperature during heating cycle. The signal data from each thermal sensor is converted to time temperature profile which is used to verify and calibrate the TLD system.

First claim

What is claimed is:

1. A thermoluminescence-based dosimetry system comprising:
a) at least one thermoluminescent dosimetry (TLD) element operative to be heated controllably and to emit luminescence during the heating, the emitted luminescence correlated with a radiation dose to which each of said at least one TLD element has been exposed;
b) a temperature verification subsystem for real-time monitoring of temperature data of each TLD element during the heating, comprises a removable holder and at least one temperature sensor housed on said holder, wherein said removable holder is configured to be inserted in said thermoluminescence (TL) measuring subsystem and said temperature sensor is configured to therein provide a time temperature profile of each TLD element;
c) a heating subsystem for providing a controllable heating rate of each of said at least one TLD element;
d) a thermoluminescence (TL) measuring subsystem for measuring the emitted luminescence, and for providing luminescence data; and
e) a control subsystem for controlling heating parameters of the heating subsystem based on the heating rate and for providing at least one glow curve based on the luminescence data, the glow curve indicative of the radiation dose.

2. The TLD system of claim 1 , wherein the noninvasive temperature verification subsystem includes at least one temperature detector.

3. The TLD system of claim 2 , wherein the temperature detector further comprises:
a) at least one thermal sensor, each thermal sensor is placed in close proximity of one of the at least one TLD element, to measure the temperature of the respective TLD element and to produce a signal data that correlates with the temperatures of the respective TLD element during heating;
b) a sensor reader operatively connected to and receives the signal data from the at least one temperature sensor and converts said signal data to temperature data; and
c) a data logger operatively connected to, receives and records temperature data received from the temperature sensor reader and produces a time temperature profile of the respective TLD element.

4. The TLD system of claim 3 , wherein said temperature sensor is selected from the group consisting of a thermocouple, and a resistance thermometer.

5. The TLD system of claim 1 , wherein the heating system includes a heater, a gas source and a conduit, wherein the conduit channels a flow of gas from the gas source, transfers heat from the heater to the gas, and discharging heated gas against said TLD element.

6. A method for verifying time temperature profile of a thermoluminescence-based dosimetry system comprising the steps of:
a) heating the thermoluminescence-based dosimetry system at a controlled heating rate;
b) obtaining temperature data of each of TLD elements during heating using signal data collected from a thermal sensor placed near each of the TLD element;
c) creating a time temperature profile of each TLD element using temperature readings of each TLD element; and
d) comparing the measured time temperature profile to an expected time temperature profile.

7. The method of claim 6 , wherein the expected time temperature profile is produced using a temperatures from the heating controller.

8. The method of claim 6 , calibrating controlled heating of said thermoluminescence -based dosimetry system according to the comparison between the measured time temperature profile and the expected time temperature profile.

Assignees

• Us Navy

Inventors

• Benevides Luis
• Delzer Jeffrey

Classifications

• G01K13/00 Primary

  Thermometers specially adapted for specific purposes · CPC title

• G01T1/11

  Thermo-luminescent dosimeters {(thermo-luminescent compositions C09K11/00)} · CPC title

• G01T1/115

  Read-out devices · CPC title