Genuine nuclear radiation Cumulative measurement thermoluminescent dosemeter high quality thermoluminescence dose tablets

Features and uses:

Lithium fluoride thermoluminescence detector is a passive solid integral detector. It is characterized by small volume (high spatial resolution), effective atomic number close to the air and human tissue, free from electromagnetic interference, wide measuring range, low measurable limit, good reproducibility, high dose rate pulse can be measured Radiation field and so on. They can be used for personal monitoring of ionizing radiation, environmental monitoring, and specific radiation field measurements (including differential measurements of n, gamma mixing fields). But also can be applied to radiology, radiobiology, reactor engineering, archeology and other disciplines.

TLD2000 series detectors are developed on the basis of the original GR200 series detectors and domestic similar detectors. The TLD2000S detectors adopt uniform single-sided measurement, so that the consistency of components is much better than GR200 series components.

Performance indicators:

(1) The linear range: 10^-7 - 12Gy (10μrad-1200rad).

(2) Relative sensitivity per mg: 30 - 40 times that of TLD-100.

(3) Detection threshold: about 10^-7Gy (~ 10μrad).

(4) Energy response: For 30 keV-3MeV photons, the response to a unit absorbed dose is not energy-dependent.

(5) The dispersion of the same batch: <5% (1σ).

(6) Reproducibility: <3% (1σ).

(7) Response to neutrons: The LET dependence of the response to the absorbed dose due to heavy particles facilitates the differentiation of the gamma components in the n, γ mixing field.

(8) The stability of storage information: storage at room temperature no significant decline in a month, stored at 50 ℃ for about a month decline of about 3%.

(9) Light effects: the indoor scattering of sunlight, incandescent light, fluorescent no significant response; direct sunlight (UV) response

(10) Working environment: T <50%; RH <90%.

The use of conditions and operating matters:

(1) Measuring the heating procedure:

It is recommended to use two-stage program temperature, the first stage constant temperature temperature of 135 ℃ 8 seconds, the second stage constant temperature 240 ℃ 20 seconds, heating rate: 15 ℃/s

(2) When measuring, place the "TL" side of the detector (circular) facing up.

(3) Repeat the use of the annealing conditions: 240 ± 2 ℃ (not more than 242 ℃), 10 minutes (constant temperature time).

(4) Glass tube components and powder components heating, annealing conditions:

The temperature of the first stage was 140 ℃ (10 seconds), the second stage of constant temperature was 270 ℃ (15 seconds), and the rate of temperature increase was 40 ℃ / s

Annealing temperature: 240 ± 2 ℃ (not more than 242 ℃), 10 minutes (constant temperature time).

Sensitivity standard:

Our company is the manufacture of TLD detector specifications of the most complete units. In order to ensure the detection requirements of the International Health Organization, the detector sensitivity dispersion has been controlled to the same batch of ± 5%. Each user a separate file, within 5 years can guarantee to provide users the same sensitivity of the detector. In this case,

Products are widely used:

In the past 20 years, the Company has provided high-quality detectors to France, the United States, Spain, Taiwan and the United Kingdom. At the same time, the Company has provided nuclear power plant, Environmental Protection Agency and other units. From 1996 to 2007, the Institute of Radiation Safety and the International Atomic Energy Agency (IAEA) wrote a research project entitled "Methods of Dosimetry in Radiation Therapy", which have been recommended by IAEA experts for their good performance and excellent price-performance ratio. 

Application of TLD2000C Thermoluminescence Detector:

After purchasing the TLD-2000C detector, calibrate the original on a thermoluminescence readout using the unit as follows:

(1) remove 100 or so for annealing. After the temperature of the annealing furnace is raised to 240 ℃ for 30 minutes, the annealing pan of the detector is carefully placed in the center of the annealing furnace with tweezers. After closing the furnace door, the temperature will drop to 240 ℃. Time 10 minutes, 10 minutes after the cold can be removed from the annealing plate. (Note: the annealing plate when the detector must be tiled)

(2) after the end of the irradiation, must be in the standard dose field irradiation 1mGy or 0.876mGy.

(3) the instrument calibration instructions: your purchase detector for the same file sensitivity of the detector. 200 sheets were arbitrarily taken out and annealed at 240 ℃ for 10 minutes. After the annealing of the 200 detectors to China Institute of Standards irradiation dose of 0.876mGy.

40 minutes after opening the instrument, press the 10-second door, measure the standard light source, read 6 times, the average value of A standard light value.

Ten standard dose shots were measured and two of the ten readings were removed and the two were minimized. The average of the remaining 6 numbers is B.

B / 0.876 = A standard light value when the correction factor is 1. After calibration, record the readout value and the high voltage value of the final instrument. The value of this mark is the sensitivity when the original scale parameter is "1". (This value does not take into account the energy correction).

(4) the measurement TLD detector (round piece) marked "TL" face up.

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