Determination and Evaluation of Dead Time for X-ray Fluorescence Spectrometer
When an X-ray photon which is generated by the sample enters into the detector,pulses can be produced and recorded.The detector is unable to respond to another photon that enters at the same time when a photon is being detected.The time that the detector takes to respond to a photon is regarded as dead time.For the x-ray fluorescence detector,the recorded count is less than the real count impulse due to dead time.Hence,to correct x-ray intensity of samples whose element content is vastly different,determination of dead time is necessary.In this paper,a new and complete way to determine dead time is proposed,which can be summarized as intensity pair method.Three intensity pairs were used for determining dead time,which were intensity pair of collimators (S2 and S4),intensity pair of spectral lines (Kα and Kβ) and intensity pair of beads with different flux-sample ratio (higher SH and lower SL analyte content in the beads).It comes to a conclusion that dead time obtained from intensity pair of beads is the most practical method for correcting X-ray fluorescence intensity.As for routine analysis,the dead time of proportional counter can be accurate to 1 × 10-9s,which can make intensity correction error less than 0.1%.
dead time fluorescence intensity
Ran Yan Yubing Liu Ping Dai
China Building Material Test &Certification Group Co.Ltd.,China Building Material Academy
国际会议
景德镇
英文
445-449
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）