| The work of this dissertation is mainly to synthesize sparkle transparent ceramic material with certain transmittance through YAG-doped uranium-doped YAG.This article is composed of two aspects.The first part:single uranium doped YAG ceramics,doped uranium ions replace part of Y3+ in the lattice.The(Y1-XUx)3Al5O12 transparent ceramic(x = 0～0.01)with single uranium was successfully synthesized by sintering at 1900 ℃ in a high-temperature vacuum environment for 10 h.The samples are pure YAG phases and the highest transmittance of 79.04%at the 714 nm when x = 0.002.By measuring the transmittance and absorption spectrum of ceramics,it was observed that there are many absorption peaks in the single-doped U:YAG ceramics from 250 nm to 1000 nm,it related to the 6d→5f transition of U4+ ions.After XPS analysis,it was found that the doped uranium ion state was U4+,consistented with the valence which we hope to get.The second part:cerium and uranium co-doped(Ce,U:YAG)ceramic.By adding yttrium oxide and a fixed uranyl nitrate content(the uranium doping concentration is fixed at 0.2 at%).The doped Ce3+ and U4+ ions will replace parts of Y3+ in the crystal lattice.The cerium and uranium codoped(Y0.998-xU0.002CeX)3Al5O12 transparent ceramics(x = 0～0.002)were successfully synthesized by incubating at a high temperature of 1900 °C for 10 h.Pure phase YAG ceramics were obtained by XRD analysis,and among the samples had the highest transmittance of up to 80.24%when x = 0.002.By exciting with the 450 nm,a broad-band emission spectrum was observed with a coverage wavelength of 490-710 nm and a peak emission peak at 549 nm.This is due to the allowable 5d→4f orbital energy level transitions of the Ce3+ ioN.In the wavelength range of 500 nm to 900 nm,the transmittance of the ceramic sheet is as high as 80.24%,and there are many absorption peaks.The absorptions at 450 nm and 674 nm are related to the allowable 5d→4f energy transitions of the Ce3+ ion and the 6d→5f energy transitions of the U4+ ion,respectively.The application of uranium-doped scintillation ceramics in neutron detection is a new exploration idea.In the study of high-energy physics,it has potential application value especially in the fields of nuclear energy,Production and application of radioisotopes.Unlike charged particles,neutrons can not be directly detected by ionization due to neutrality.In contrast,neutrons are characterized by high energy fragment energy of the reaction product,which is obtained through the interaction between neutrons and nuclen.The signal-to-noise ratio(SNR)of the detection system will be an important and challenging parameter,as the accompanying gamma rays in the interaction can also be detected.In several interactions,nuclear fission is superior to a high signal-to-noise ratio,benefiting from its high-energy fission debris as a detected object,and the higher energy than the energy from gamma rays.This experiment is to strengthen the feasibility of uranium single-doped and cerium-uran co-doped(Ce,U:Y3AL5o12)and well be a new materials in neutron detection. |
PDF Full Text Request