# US 2017/0284871 A1 · Device for noninvasively verifying thermoluminescent dosimeter card heater time temperature profile

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- Number: US 2017/0284871 A1
- Document ID: US20170284871A1
- Status: Published application
- Kind: A1
- Application number: 15/381,690
- Filed: 2016-12-16
- Published: 2017-10-05
- Earliest claimed: 2015-12-16
- Assignees: The United States of America as represented by the Secretary of the Navy
- Applicants: The United States of America as Represented by the Secretary of the Navy
- Inventors: Luis Benevides; Jeffrey Delzer
- Web page: https://patentgrep.com/patent/US20170284871A1

## CPC

- G01K 13/00: Thermometers specially adapted for specific purposes
- G01T 1/11: Thermo-luminescent dosimeters {(thermo-luminescent compositions C09K11/00)}
- G01T 1/115: Read-out devices
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## 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.

## Claims

### Claim at position 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 the TLD element has been exposed; and
b) a noninvasive temperature verification subsystem for real-time monitoring of temperature data of each TLD element during the heating, and for providing a time temperature profile of each TLD element.

### Claim 2 (depends on 1)

2) The TLD system of claim 1, further comprising:
a) a heating subsystem for providing a controllable heating rate of each TLD element;
b) a thermoluminescence (TL) measuring subsystem for measuring the emitted luminescence, and for providing luminescence data; and
c) 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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 3)

4) The TLD system of claim 3, 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.

### Claim 5 (depends on 4)

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

### Claim 6 (depends on 2)

6) The TLD system of claim 2, 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, transfer heat from the heater to the gas, and discharging heated gas against said TLD element.

### Claim 7

7) 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 measured the time temperature profile to an expected time temperature profile.

### Claim 8 (depends on 7)

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

### Claim 9 (depends on 7)

9) The method of claim 7, 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.