Thermoluminescent dose reader
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Brief description:A thermoluminescence dose reader is a measuring device that uses the principle of thermoluminescence to record cumulative radiation dose. The radiation dose absorbed by thermoluminescent or photoluminescent materials contained in a dose box can be effectively measured. The radiation dose is read by measuring the thermoluminescence output using a cooled photomultiplier tube.
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Detailed introduction
A thermoluminescence dose reader is a measuring device that uses the principle of thermoluminescence to record cumulative radiation dose. This instrument usually includes a sample drawer for loading single element TL detectors or thermoluminescent elements of various shapes (such as discs, square discs, glass tubes, powders, etc.). These devices feature programmable linear heating systems for independent heating cycles on the sample, such as annealing before reading, acquisition and annealing after reading, etc.
The radiation dose absorbed by thermoluminescent or photoluminescent materials contained in a dose box can be effectively measured. The radiation dose is read by measuring the thermoluminescence output using a cooled photomultiplier tube. The main advantage of these instruments is that their readings decay very little, even after being left aside for long periods of time. Provides unattended operation of multiple dosimeters and accommodates various sizes of TL chips, discs, rods and cubes.
The use of a thermoluminescence dose reader requires following certain steps and precautions. First, place the thermoluminescent dosimeter or phosphor to be tested into the sample drawer. For some special models of dosimeters,
It is equipped with different monitoring areas for monitoring lens dose, deep dose and superficial dose, and needs to be worn and used accordingly.
Then, according to the instrument's operating guide, set the heating program, including preheating time, annealing temperature and other parameters. After starting the device, the instrument performs independent heating cycles on the sample, such as annealing before reading, acquisition and annealing after reading, etc.
During the heating process, the thermoluminescence output was measured using a cooled photomultiplier tube. This output signal represents the absorbed radiation dose value. For some models of thermoluminescence dose readers, not only strips, cylinders, microcubes or powdered TLD elements can be measured, but they are also equipped with a programmable linear heating system.
Then, read and record the measurement results. Special attention should be paid to the operation manual should be strictly followed during use to ensure the accuracy and safety of measurement. Moreover, the readings of these instruments will decay very little even if they are left aside for a long time. In addition, please complete the personal dosimeter wearer information form after receipt and keep it properly until the end of the monitoring cycle and return it together with all dosimeters.
The advantages of thermoluminescence dose readers are mainly reflected in the following aspects:
1. High reading stability: The thermoluminescent dosimeter uses the principle of thermoluminescence to record the cumulative radiation dose. Even if it is left aside for a long time, its reading will attenuate very little.
2. Wide range of applications: Thermoluminescence detectors are widely used in fields such as radiation protection, radiation medicine, radiobiology, geology, archaeology and environmental protection, especially in personal dose monitoring.
3. Easy to use: The thermoluminescence dosimeter is often worn on the chest and sent for regular inspection at regular intervals. It is mainly used to record and detect the cumulative dose. It has an integrated design and can be used to measure whole body dose, beta, photon, neutron dose, etc.
4. Reusable: Thermoluminescent elements can be reused. However, the thermoluminescent element after being irradiated by nuclear radiation is only allowed to be heated and measured once, because after heating, the stored information is destroyed and the measurement results cannot be reviewed.
It should be noted that the operation manual should be strictly followed during use to ensure measurement accuracy and safety. Moreover, the readings of these instruments will decay very little even if they are left aside for a long time. In addition, please complete the personal dosimeter wearer information form after receipt and keep it properly until the end of the monitoring cycle and return it together with all dosimeters.
Thermoluminescent dose reader product features:
1. The thermoelectric photomultiplier tube cooler has the highest stability measurement guarantee;
2. Automatically deduct background capabilities;
3. Operation, repair and maintenance are easy;
4. Optional neutral density filters can withstand temperatures up to 600°C;
5. Weld the thermocouple to ensure that the metal plate reaches the heating temperature reproducibly;
6. The heating curve includes preheating, acquisition and annealing cycles;
7. Heating temperature can reach 600℃;
8. Thermal energy detection can reach 7 orders of magnitude;
9. Optional neutral density filter to expand high range.
Harshaw TLD3500 manual thermoluminescence dose reader
Product application:
1. Environmental monitoring;
2. Nuclear power plant regional monitoring;
3. Personal dose monitoring;
4. Neutron monitoring.
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