Kinheng designed Be window detectors for low energy X-ray detector. According to the traditional encapsulation method, the detection efficiency of X-ray is low. X-ray detector used 0.2mm thickness Be window to replace traditional 0.8mm thickness aluminum shell. The X-ray detection efficiency was improved significantly. X Series detector follows the design idea of detachable and replaceable. It can use either NaI(Tl) crystal with output pulse width of 1.5us or LaBr3:Ce crystal with output pulse of 0.5us to meet the measurement requirements of high and low doses.