Comparison between X-ray thickness gauge and γ-ray thickness gauge
(1)Physical properties
The X-ray beam can be reduced to a very small point, and its structural geometry is not limited, but gamma rays cannot do this, so the photon intensity will decrease sharply and the noise will increase significantly.
(2)Signal/noise ratio
X-ray thickness gauge: The high photon output of X-rays can bring about a noise coefficient that is about 10 times better than that of gamma rays at the same time constant.
(3)Reaction time
The X-ray thickness gauge has a high photon output and a small time constant, which is very advantageous for rapid adjustment of the AGC system. The time constant of the gamma ray thickness gauge is about 5 to 10 times.
(4)Measurement accuracy
The selected energy of the γ-ray source is a single energy source and cannot be changed. It ensures accuracy within 0~1mm (T2 material). It is difficult to guarantee the same accuracy within 2~3mm. The X-ray thickness gauge emits high photon energy for the X-ray tube; the operator can automatically change the voltage KV to the optimal value by selecting each nominal value on the noise curve. Ensure the measurement accuracy of any type within 1~4mm (referring to 60KV~80KV).
(5) Scope of application
For the measurement of various copper alloys, the X-ray thickness gauge has wider adaptability and better effect than the gamma-ray thickness gauge.
(6)Safety and environmental protection
The isotope used as the source of the gamma ray thickness gauge; the isotope is a radioactive element. When measuring strips, they all have the same energy. The measurement accuracy is inaccurate and the measurement noise is high. The energy of rays cannot be adjusted and controlled, and long-term use may cause environmental pollution and personal injury. The radiation source of the X-ray thickness gauge uses an X-ray tube, which can control and turn off the radiation source. The X-ray thickness gauge does not emit radiation when not in use, but only emits a narrow beam in the direction of the strip when in operation. Safety and environmental protection, measurement.
For steel plates, X-ray thickness gauges can only measure a thickness of 50mm, while gamma-ray thickness gauges can maintain high applicability within a thickness range of 120mm (less accurate than X-ray thickness gauges)
