Jieqing Zhu,G. L. Allan,G. J. F. Legge,J. C. McCallum,C. D. McKenzie,J. Camakaris
Vol. 09, Issue 4, (1986)
摘要:The scanning proton microprobe has established itself as an essential tool for quantitative and trace elemental microscopical analysis and for n on-destructive depth profiling. This paper discusses the major strengths and limitations of the instrument, the advances that have been made and the directions in which instrumental research is progressing to enable further improvements in probe performance. Recent applications in medical and in semiconductor research are presented in order to illustrate the significance of these improvements.
Caiqin Yu,Xiazhen Yuan,Dong Cai,Hongxia Bian,Huizhen Xue,Yougen Wu,Shunyuan Wang
Vol. 09, Issue 4, (1986)
摘要:We had used highly sensitive instruments to measure the radioactivity in irradiated apples by cobalt-60. The irradiation dose was thirty thousand rads. These apples were from three different places. Their gamma-ray spectra were measured with an HPGe compton suppression spectrometer. The main radioisotope in the apples is 40K, total α, total β and 40K radioactive intensities were given for the irradiated and non-irradiated apple samples.The experiment results pointed out that the radiations in irradiated and non-irradiated apples were the same. The work gives the radioactivity background in the apples.
关键词:irradiated apples;determination of the radioactivity background
摘要:Kerosine has been examined as scintillator solvent. By measuring the relative output pulse amplitude and detection efficiency as a function of PPO, POPOP and naphthalene concentrations we have come to the conclusion that deoxygenated kerosine containing 4.0g/l PPO, 0.03g/l РОPОР and 60.0g/l naphthalene is an efficient liquid scintillator. Its light output and detection efficiency relative to toluene containing 4.0g/l TP, 0.4g/l POPOP are 45% and 93% respectively. Its refractive index and emission spectrum were also measured: n = 1.4442, =423nm, m = 415nm.
摘要:Dose-rate effects of 137Cs and 60Co gamma-rays on chromosomal aberration rate of root tip cells in rice were investigated. Results showed that frequencies of chromosomal aberration in root tip cells of rice varied with dose-rate under the same dose. The differences among them were very significant. The dose-rate effects could be fitted by the curvilinear regression equation.
关键词:Gamma-rays;dose-rate effects;root tip cell;chromosomal aberration frequency;curvilinear;regression equation
摘要:Studies on the occurrence of late and early erythroblasts with micronuclei in the bone marrow of four generations of white rats fed fresh mushroom irradiated to 0.49kGy and 0.98kGy by 60Co source are reported.Observations done on 280 rats revealed that whereas significant increase in the occurrence of late and early erythroblasts possessing micronuclei took place in the positive control group, no significant difference in the incidence of erythroblasts with micronuclei was found between the groups fed mushroom irradiated with 0.49kGy and 0.98kGy and the untreated mushroom.