99 Tc,127I,237 Np and 241 Am are high-toxic and long lived-radionuclides in nuclear fuel waste.If these nuclides are transformed into short-lived or stable nuclides in ADS transmutation process,the waste has lower radiotoxicity.The rapid analysis of these nuclides before and after transmutation becomes very important.XRF is a very simple analytical technique:X-rays excite atoms in a sample,which emit X-rays at energies characteristic of each element.A detector measures the energies and intensities of the emitted X- 99 Tc, 127I, 237 Np and 241 Am are high-toxic and long lived-radionuclides in nuclear fuel waste. These nuclides are transformed into short-lived or stable nuclides in ADS transmutation process, the waste has lower radiotoxicity. The rapid analysis of these nuclides before and after transmutation becomes very important. XRF is a very simple analytical technique: X-rays excite atoms in a sample, which emit X-rays at energies characteristic of each element. A detector measures the energies and intensities of the emitted X-