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Model and method for ocular lens dosimeter calibration

A technology of dosimeter and model, which is applied in radiation measurement and instruments, can solve the problem of underestimating the dose of the eye lens, and achieve the effect of perfect monitoring

Pending Publication Date: 2021-02-09
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

It has been pointed out in the literature that the eye lens dosimeter can be calibrated with a flat model (30cm×30cm×15cm), which can basically meet the requirements when photons are incident in the forward and backward directions, but will greatly underestimate the dose of the lens in the case of side incidence. Low-energy photons are especially serious

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  • Model and method for ocular lens dosimeter calibration
  • Model and method for ocular lens dosimeter calibration
  • Model and method for ocular lens dosimeter calibration

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Embodiment Construction

[0024] like figure 1 , figure 2 As shown, a method for eye lens dosimeter calibration includes the following steps:

[0025] Step 1. Establish the model 1 of the eye lens dosimeter scale and test, and the model 1 is designed as an elliptical cylinder;

[0026] Step 2. Place the dosimeter 2 close to the surface of the model 1, and place the dosimeter 2 on the left side of the model 1 at a vertical distance of 3 cm from the long axis;

[0027] Step 3. Use the photon parallel radiation beam 3 to irradiate the model 1 forward, and conduct an angle response test: take the central axis of the model as the rotation axis and rotate together with the dosimeter 2, and the angle between the long axis of the model and the incident direction of the parallel radiation beam is Angular response angle α;

[0028] Step 4. Perform reading analysis on the dosimeter, and complete the calibration or test of the dosimeter according to the true value of the irradiation and combined with the dose ...

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Abstract

The invention relates to a model and a method for ocular lens dosimeter calibration. The method comprises the steps: 1, building an ocular lens dosimeter scale and test model which is designed into anelliptic cylinder shape; 2, tightly attaching a dosimeter to the surface of the model, and placing the dosimeter at the position, 3 cm away from the long axis, of the left side of the model; 3, irradiating the model by using photon parallel radiation beams, and carrying out various tests, experiments, calibration or analog simulation; and 4, completing testing, experiment, calibration or analog simulation by taking the irradiation true value as the criterion and combining the dose conversion coefficient Hp (3) / Ka of the ocular lens dose equivalent to the air specific release kinetic energy and the dosimeter reading. The structure and the size of the ocular lens dosimeter scale model are closer to the real situation of the human head, the photon absorption and scattering situation of the head can be better reflected, and the ocular lens dosimeter scale model is beneficial to further perfecting eye crystal dose monitoring, evaluation and radiation protection work.

Description

technical field [0001] The invention relates to the field of ionizing radiation dose and protection, in particular to a model and method for eye lens dosimeter calibration. Background technique [0002] Recently, the international occupational exposure lens dose limit has been greatly reduced, from the original 150mSv per year to an annual average dose of no more than 20mSv for five consecutive years, and the dose equivalent in any single year should not exceed 50mSv. This important change makes the dose monitoring of the lens of the eye extremely urgent and necessary. [0003] The eye lens dose can be monitored by wearing an eye lens dosimeter. Before the dosimeter is used, it needs to be calibrated to establish the relationship between the dosimeter reading and the actual exposure dose, which requires a calibration model and method. In addition, in dosimeter type experiments, performance tests and other experiments, models are also needed to simulate the scattering condi...

Claims

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Application Information

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IPC IPC(8): G01T7/00
CPCG01T7/005
Inventor 卫晓峰刘立业曹勤剑焦岩赵原肖运实熊万春李晓敦金成赫夏三强汪屿赵日刘一聪
Owner CHINA INST FOR RADIATION PROTECTION
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