Inspection standards for radiation protection lenses

Inspection standards for radiation protection lenses

The National Glasses Quality Supervision and Inspection Center entrusted Jinling Institute of Science and Technology to be responsible for drafting the testing standard (draft) for radiation protection lenses, but the standard has not yet been officially released, and the analysis and discussion in this book is for reference only. The standard puts forward specific requirements for the radiation protection performance of lenses, the main contents of which include:1. The radiation protection of radiation protection lenses refers to electromagnetic radiation outside the visible light and ultraviolet bands. The significance of this article is that the radiation protection function of the radiation protection lens proposes a more accurate electromagnetic spectrum range, the radiation protection lens on the market is varied, many manufacturers under the banner of radiation protection glasses, but in fact, the use of anti-ultraviolet function to deceive consumers. And actually in GB 10810. 3-2006 Spectacle Lenses Part III: Transmittance Specifications and Measurement Methods It has been clarified that lenses other than presbyopia glasses and near-use lenses must meet specific requirements for UV protection. In the new draft standard, it is clarified that the radiation protection performance is conducive to regulating the radiation protection lens market. 2. The ambient temperature of the detection system should be 15~35°C, the relative humidity should be 45%~75%, and the air pressure should be 86 kPa~ 106 kPa. The detection environment must meet the national electromagnetic radiation protection regulations GB8702 in Table 2.2.2 of Table 2 public exposure export limit. The detection position needs to be carried out in the room of the ordinary reinforced concrete structure, and the distance from the ground and the surrounding wall is generally taken 1. 5~2 m position measurement. This article refers to the working and living environment for most people who wear radiation protection lenses, and there may be significant changes in performance in some specific environments. In GB8702, the export limit of public electromagnetic radiation is specified as a reference result of the average value of electric field strength (V/m), magnetic field strength (A/m) and power density (W/m2) of the parameters of the environmental electromagnetic radiation field in different frequency ranges within any continuous 6 min within 24 hours. 3. Use a spectrum analyzer that conforms to national standards to analyze the space frequency, and select the frequency of energy in the space environment that meets the requirements for measurement. Each measurement selects a large value of steady state within 6 minutes of continuous use, and records the test result P1 at that point. Then add lenses at the same point before the spectrum analyzer tests the probe and measure and record the data P2 in the same way. The attenuation ratio r of the measurement data P2 after the addition of the lens and the first measurement data P1 is taken as the classification data of the radiation protection lens, and the calculation method is as follows: R=P1 - P2 /P1 The attenuation ratio r of the radiation protection performance before and after the addition of the lens meets the requirements of the following table. Attenuation Ratio Category r<≥50% Class A Radiation Protection Lens 10%≤r<50% Class B Radiation Protection Lens 1%≤r<10% Class C Radiation Protection Lens This draft does not follow the usual method of measuring resistance or specific radiation value, but adopts the attenuation ratio method. The attenuation ratio is more practical for the wearer. Because there are many uncertainties in terms of measurement resistance or specific radiation values, high demands are placed on the measurement environment. The attenuation ratio method can more clearly describe the performance and actual radiation protection ability of radiation protection lenses. For radiation-resistant lenses, the method of classification and grading by percentage is conducive to lens manufacturers to continuously innovate technology and improve the performance of radiation-resistant lenses.。