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五、镀层厚度测量仪 以前大都采用同位素β射线反射法来测量带钢镀层厚度,但它只适用于镀层厚度大于350克/米~2的情况。而对于0～350克/米~2这样较薄的镀层厚度,其测量灵敏度不够高,因此目前采用灵敏度较高的伦琴射线萤光法。两种方法灵敏度的比较如图24所示。 伦琴射线萤光法的测量原理如图25所示。同位素射源安装在电离室接收窗的中心位置,使射线向被测体照射,在放射源和电离室之间采用很厚的屏蔽,以防止射线对电离室的直接照射。这里采用同位素放射源是镅Am~(241),其射线的量子能为60仟电子伏,这是一种能量比较低的γ射线。
Fifth, the thickness of the measuring instrument Most of the previous use of isotope β-ray reflectometry to measure the thickness of strip coating, but it is only applicable to coating thickness greater than 350 g / m ~ 2 case. For 0-350 g / m ~ 2 such thin coating thickness, the measurement sensitivity is not high enough, so the current high sensitivity of the roentgen ray fluorescence method. The sensitivity of the two methods is shown in Figure 24. The principle of the measurement of the Roentgen Ray Fluorescence is shown in Figure 25. The isotope source is installed in the center of the ionization chamber receiving window to allow radiation to be radiated to the body under test. A thick shield is used between the source and the ionization chamber to prevent direct exposure of the ionization chamber to radiation. The isotope radioactive source used here is 镅 Am ~ (241), which has a quantum energy of 60 电 eV, a relatively low energy γ-ray.