No abstract

In neutron activation analysis based on the ko standardization method (ko INAA), the ko-factor is a combination of nuclear constants and it was measured by experiments. It plays an important role in the accuracy of ko-INAA method. Therefore, it is necessary to measure the ko-factors in many different neutron sources and compare the results. In this paper, the ko- factors to gold of manganese (ko, Au(Mn)), cadmium ((ko, Au(Cd)), Chromium ((koAu(Cr)), Zinc ((ko, Au(Zn)), Arsenic ((ko, Au(As)), Vanadium ((ko,Au(V) by neutron activation with the Am-Be isotope neutron source were measured. The comparision between our results and the results of Decorter et. al. showed relative differences of less than twenty percents. Among which, our most accurate result was found in (ko, Au(Mn) with only 1.18 percents relative difference.

Nowadays, in both industry and scientific research, there has been a demand for determination of matters thickness. In this article we will bring out two methods which are very simple, fast, effective and low-cost in getting exactly thickness of thin foils (pm). Both two these methods are based on energy loss of alpha particle when it passed through foil and then detected by high energy resolution alpha spectroscopy.

In this paper, the ML-EM (Maximum Likelihood Fitting by Expectation Maximization) algorithm was used in deconvolution of continuum gamma ray for HPGe detector. A set of response functions was simulated by using MCNP4C2 code for gamma radiation emitted from point source located at 10.6cm from detector. The source energies varied from 50.1 keV to 1502.1 keV with 2.5 keV step were detected by the 8192 - channel spectrometer. The results of deconvolution for some gamma spectra of Co-60, CS-137, Eu-152 showed that the photopeak areas of the deconvoluted spectra were considerably raised in compare with ones of measured spectra in the same condition.