Yuqing Yang

The effect of temperature changes on electrical performance of the betavoltaic cell.

There is a significant relationship between temperature and electrical performance of a betavoltaic cell. Two silicon diodes used as energy conversion devices of betavoltaic cells were irradiated by Ni-63, and the relationships between the temperature and the electrical performance such as V(oc), I(sc), and P(max) were examined. I(sc) increased very little as temperature increased but V(oc) decreased considerably. The changing values of V(oc) were -3.1 and -3.0 mV/K, respectively, in the temperature range 233.15-333.15 K. As a result of this, P(max) and eta also decreased markedly.

Simulations about self-absorption of tritium in titanium tritide and the energy deposition in a silicon Schottky barrier diode

Simulations on the self-absorption of tritium electrons in titanium tritide films and the energy deposition in a silicon Schottky barrier diode are carried out using the Geant4 radiation transport toolkit. Energy consumed in each part of the Schottky radiovoltaic battery is simulated to give a clue about how to make the battery work better. The power and energy-conversion efficiency of the tritium silicon Schottky radiovoltaic battery in an optimized design are simulated. Good consistency with experiments is obtained.

Investigation on a radiation tolerant betavoltaic battery based on Schottky barrier diode

An Au-Si Schottky barrier diode was studied as the energy conversion device of betavoltaic batteries. Its electrical performance under radiation of Ni-63 and H-3 sources and radiation degradation under Am-241 were investigated and compared with those of the p-n junction. The results show that the Schottky diode had a higher I(sc) and harder radiation tolerance but lower V(oc) than the p-n junction. The results indicated that the Schottky diode can be a promising candidate for energy conversion of betavoltaic batteries.

The radiation damage of crystalline silicon PN diode in tritium beta-voltaic battery

A tritium beta-voltaic battery using a crystalline silicon convertor composed of (100)Si/SiO2/Si3N4 film degrades remarkably with radiation from a high intensity titanium tritide film. Simulation and experiments were carried out to investigate the main factor causing the degradation. The radiation damages mainly comes from the x-ray emitted from the titanium tritide film and beta particle can relieve the damages. The x-ray radiation induced positive charges in the SiO2 film destroying the output property of the PN diode with the induction of an electric field.

Preparation of 99mTc(CO)3-TPPS4 and its biological behavior evaluation

99mTc(CO)3-TPPS4 was prepared via the precursor [99mTc(CO)3(H2O)3]+ and a preliminary investigation on its stability and behavior in Hep2 tumor cells and hepatoma-bearing mice were conducted. Labeling yield and stability of 99mTc(CO)3-TPPS4 was radioactively analyzed by paper chromatography. Hep2 tumor cells were incubated with 99mTc(CO)3-TPPS4 complex system in the substrate and isolated from the substrate for radioactivity count. Then 99mTc(CO)3-TPPS4 complex system was intravenously injected in hepatoma-bearing mice and directly injected in tumor tissue of the mice. Mice were photographed using SPECT. Labeling yields of 99mTc(CO)3-TPPS4 were more than 90% at pH = 7–8, 30 min, in a boiling bath, and it was stable for at least 14 h at pH = 2–8, rt ~95 °C. The uptake of 99mTc(CO)3-TPPS4 in HepG2 tumor cells was only 3–4% with the maximum uptake-time of 20 min. The SPECT images of hepatoma-bearing nude mice showed no uptake or little retention of 99mTc(CO)3-TPPS4 in the tumor tissue. Then the differences between 99mTc(CO)3-TPPS4 and TPPS4 were analyzed by fluoroscopy and molecular structure. It was found that the paper chromatography, HepG2 tumor cell uptake and the optimized porphyrin ring conformation of 99mTc(CO)3-TPPS4 were quite different from those of TPPS4. It was indicated that 99mTc(CO)3-TPPS4 had no uptake or little retention in hepatic tumors, unlike those biological behaviors of TPPS4. This may be due to the modification of porphyrin ring conformation of TPPS4 by 99mTc(CO)3 core.

Synthesis and characterization of novel water-soluble 117mSn labeled porphyrin conjugates

Abstract Two novel porphyrins, meso-tetrakis [3,4-bis (carboxymethyleneoxy) phenyl] porphyrin and meso-tetrakis [4-sulfophenyl] porphyrin, were synthesized using improved methods and were labeled with 117mSn(113Sn). Their structural parameters and chemical characteristics, such as conjugate yield, coordinating rate, apparent charge, in vitro stability and liposolubility were evaluated. The results indicated that 117mSn (113Sn)-labeled porphyrins have higher yield, good stability, better anti-dilution and lower liposolubility. This study provides a sound foundation for further in vivo studies of radionuclide-labeled porphyrins.

Preparation and primary biological evaluation of novel nitrido-188Re complexes/lipiodol

Abstract Two new nitrido- 188 Re complexes were prepared by a modified method in high yield. These complexes were stable in vitro. The biodistribution in normal mice showed that these nitrido- 188 Re complexes could accumulate in liver and dissipate quickly from almost all organs. TAE was performed with the use of lipiodol solutions of two complexes to rabbit VX2 liver tumor models. SPECT images showed that the two lipiodol solutions could remain in tumor for about 9 h ( 188 ReN-NEPTDD/lipiodol) and 12 h ( 188 ReN-NEMMPTDD/lipiodol), respectively.

Effect of Temperature on the Ni-63 Betavoltaic Cell

There are significant relations between temperature and the electrical performances of betavoltaic cell. Two silicon diodes as the energy conversion device of betavoltaic cell were irradiated by Ni-63, checked the relations between temperature and the electrical performances such as Voc , Isc , Pmax etc. Isc increased very little as the temperature increasing but Voc decreased significantly. The changing values of Voc were −3.1 mV/k and −3.0 mV/k respectively within the temperature range of 233.15 K∼333.15 K. As a result of this, the Pmax , η etc. decreased markedly too.Copyright