基于β射线吸收法的PM2.5测量技术的研究

Research of measuring technology for PM2.5 based on the β-Ray absorption method

针对空气中粒径小于或等于2.5μm的可入肺颗粒物对人体的严重危害,设计了基于β射线吸收法实时监测PM2.5浓度值的监测仪器。利用粉尘粒子吸收β射线的量与粉尘粒子的质量成正比关系的原理,通过测量β射线通过干净滤纸和含有粉尘滤纸前后强度的变化,测量出PM2.5的浓度值。通过与标准过滤称重法的对比校准,验证了测量仪器的准确性。

According to the air particle being into the lungs , which can harm the human body seriously and whose size are less than or equal to 2.5 μm, the monitoring instrument , which can be used for real-time monitoring the concentration value of PM2.5, is designed based on β-Ray absorption method . Using the principle of the direct proportional relationship with the amount of absorbed β-Ray and the quality of the dust particle, through measuring β-Ray and the change of the intensity between the clean filtering paper and the contained dust filtering paper, the concentration value of PM2.5 is measured. By contrast and calibration with the standard filter weighing method, the accuracy of the measuring instruments is verified.