peak-peak detector
2.Thirdly, the improved circuit system is expounded, which includes peak detector circuit, Automatic Gain Control circuit based on AD603, and counting circuit based on CPLD. Finally, after design of the circuit and debugging of the software and hardware being finished, experiments of the peak detector circuit and AGC circuit have been carried out.
3.Calculation and application of absolute full-energy peak efficiency for Ge(Li) detector-counted sample system
5.The selected chromatographic conditions were as follows: SE _ 30 column(2 m×3.2 mm), chromosorb W AW DMCS support, column temperature 250 ℃, injection temperature 280 ℃, flame ionization detector temperature 280 ℃. The fenpropathrin was quantitatively determined by the area of the chromatographic peak.
6.Based on the feature of capillary electrophoresis affected by more uncertain fac tors, Monte Carlo simulation was used to explore the influences of error factors, such as op eration parameters of charge-coupled device detector, sample injection, applied voltages,temperature etc. , on detected signal intensities, determination accurcy and precision. And the relative superiority of quantitative calculation methods of peak height and peak volume is compared.
7.The radiation of positron annihilation in two aluminum samples from different origins was measured with the Ge(Li) detector. Using the 482 keV γ peak of 181Hf as reference, the relative positions of the annihilation peak centers were repetitively determined, the precision of the determination reached ± 6 eV. The results show that the rest mass of electron in these two different aluminum samples is consistent on 10 eV level.
9.With the thin (0.3μm) ion-implanted p-type outside contact, the detector is able to detect X and γ rays from 5ekV to 10 MeV. The sensitive volume of the detector is about 120cm3, its relative efficieccy 24.5% energy resolutioe2.13 keV and the peak to compton ratio is 48.3:1 at 1.33 MeV γ ray. The electronic noise is 1.28 keV.
10.The volume of the Ge(Li)detector was 78cm~3.For γ-ray of the energy of 1332keV of ~(60)Co,the resolution of thespectrometer was about 2.4keV,the ratio of the peak to compton was 6.4without shielding,the relative efficiency was 16%,and for the γ-ray peakof ~(137)Cs the detective efficiency was 1.6%.
