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Beijing, China

Li J.-Y.,China Resources Co. | Wang F.,China Institute of Atomic Energy | Zhao Y.-G.,China Institute of Atomic Energy | Guo D.-F.,Beijing Research Institute of Uranium Geology | And 2 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2012

The progress of laser mass spectrometry (LMS) was introduced. Its history and principle characteristics were reviewed. The research and applications of LMS in geology, mining, organics, biochemistry, environment and nuclear industry were given. The trend of LMS in the future was outlined, and the main issue and the available solutions were discussed.

HTA Inc. | Date: 1997-05-13

computer software used to process and send messages in the field of security and communication.

Qi J.,HTA Co. | Yao L.-N.,HTA Co. | Liu D.-Z.,Beijing Shan Shan Modern Co. | Wang X.-J.,HTA Co. | Zhang W.-Z.,HTA Co.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2012

The 4π coincidence method is one of the most commonly used methods in the world, some metrology laboratories have set up some similar systems for standardization. It is 4πβ(PC)-γ coincidence system with some excellence. However, it is difficult with the preparation of thin films of VYNS resin for 4πbeta-counting, overcoming self-absorption and the VYNS films absorption etc. When the technique is combined with the liquid scintillation technique, the deficiencies can be clear up, It can automatically capture and process the data. It can absolutely detect the radioactivity of pure α nuclides, pure β nuclides, α-γ nuclides, β-γ nuclides and X-γ nuclides with a relatively high level of accuracy.

Liu L.,Nanjing Southeast University | Huang P.,Nanjing Southeast University | Nie Q.,Nanjing Southeast University | Qi B.,HTA Co. | And 4 more authors.
Cancer Biotherapy and Radiopharmaceuticals | Year: 2012

Aims: The aim of this study was to investigate the safety and toxicity of biodegradable 32P-chromic phosphate-poly L lactic acid ( 32P-CP-PLLA) particles interstitially implanted into Beagle dog livers. Methods: Eighteen healthy Beagle dogs were randomly divided into 6 groups (n=3), and were treated with drugs of different formulations or doses, as well as controls. At different time points after surgery, the experimental dogs were weighed. Detection of indicators of blood chemistry and liver fibrosis, SPECT bremsstrahlung imaging, computed tomography, histological examination, continuous blood measurement, and counting of urine and fecal radioactivity were performed for these dogs. Results: SPECT imaging showed that after implantation of radioactive particles into livers, radioactivity continuously accumulated in the implanted sites, while no radioactivity imaging was found in the nonimplantation sites. The mean absorbance doses in the implantation sites were 89.8-178.7 Gy. Local spherical lesions were observed in tissues. The average effective half-life time of 32P-CP-PLLA was 11.8 days. Within 4 weeks after surgery, slight or moderate swelling and degradation of liver cells were detected, while in 8 weeks after surgery, they are normal. For the blood chemistry, liver fibrosis, and other indicators, no significant differences were found between the control groups and particle implantation groups (F=1.378, p=0.232). Conclusions: 32P-CP-PLLA particles have advantages including good targeting, immobile, being degradable in vivo, easy to be protected, and so on. It is suitable for treating solid tumors with blood supply. 32P-CP-PLLA particles are a kind of safe, novel, radioactive implantation drug. © 2012, Mary Ann Liebert, Inc.

Hta Inc. | Date: 1993-11-09

hand exercise device.

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