There was no SD of the nuclide counting ratio between T_0 and T_8,T0 and T_(16),T_4 and T_(16),T_8 and T_(16),T_4 and T_8,respectively(P<0.05),except between T_0 and T_4(P>0.05).
The decay characterisitic of ~ 125 I,~ 139 Ce,~ 88 Y,~ 57 Co,~ 60 Co,~ 137 Cs and ~ 134 Cs radionuclide and the principle for measurement of specific activity of the seven kinds of nuclide with coincidence method, 4πγ ionization room method, spectroscopy method and summing peak method are simply is described.
The new nuclide 265 Bh has a half-life of 0.94 +0.70 -0.31 s and decays by alpha-particle emission with decay energy of E α=(9.24±0.05)MeV. The half-life and α decay energy of 265 Bh from this experiment are consistent with theoretical predictions.
The nuclide ratios of~(83)Kr/~(86)Kr,~(84)Kr/~(86)Kr,~(131)Xe/~(134)Xe and~(132)Xe/~(134)Xe near linearly correlated with the burnup of the spent fuel can be used for the nuclear safeguards.
A 111In → 111mCd radionuclide generator with the chemical yield higher than 95% and content of parent isotope (111In) in the 111mCd preparation less then 0.6% (relative to the activity of the target nuclide) was developed.
The variationof the nuclide composition of the technetium charges, isolated artificial ruthenium at target recycling wasanalyzed.
The behavior of the radioactive nuclide content and results of ultrasonic diagnostics of argillaceous rocks and technical ceramics is discussed.
In this work, the ratio of the intensities of 14.4-keV gamma rays emitted by the 57Fe nuclide and passing through the thin resonant absorber is measured in the absence and presence of the resonant screen around the absorber.
Mass-surface predictions near the doubly magic nuclide 78Ni
The structure and property of the high resolution α-γ coincidence spectrometer and its; applications in determining heavy nuclide qualitatively and quantitatively are described. At present, the energy resolution of the spectrometer is 0.25% (for 5.486MeV aaaaaaaaa particle,, FWHM is 13.8keV); the energy shift of peak is 0.05% during eight hours; nonlinearity is less than 0.2% for the energy region from 4 to 8 MeV.The α probe of the spectrometer mainly consists of a silicon-gold surface barrier detector...
The structure and property of the high resolution α-γ coincidence spectrometer and its; applications in determining heavy nuclide qualitatively and quantitatively are described. At present, the energy resolution of the spectrometer is 0.25% (for 5.486MeV aaaaaaaaa particle,, FWHM is 13.8keV); the energy shift of peak is 0.05% during eight hours; nonlinearity is less than 0.2% for the energy region from 4 to 8 MeV.The α probe of the spectrometer mainly consists of a silicon-gold surface barrier detector with active area 50 mm2 or 314 mm2. The detector is cooled by thermoelectric technique with a low-power Peltier element. Its temperature is decreased form room tem-perature (25℃) to - 25℃. Thus its leakage-current is decresed by 2 orders of magnitude and the system noise is also decreased; the energy resolution of the spectrometer is thus-raised.A 40×35 mm well type Nal (T1) scintillation crystal with 20 mm in well diameter and 25mm in well depth is employed in the γ probe of the spectrometer. The well wall of crystal is covered with 0.5mm thick aluminium. The crystal active thickness is about. 10mm. Thus both the loss of low energy γ-rays and the background of high energy γ-rays are decreased. At the same time, the nuclide measurement sensitivity and accuracy of mixture source are raised by changing source position to be measured in the well.In this paper, the method is being applied to the determination of 241Am in the presence of large amount of Cm and fission products, for example, when the ratio of241Am/242Cm equals 2×10-5 (α activity). It is convenient and accurate to measure 238Pu and 241Am in which the ratio of a activity is in the region of 10-2-50. Besides, it can be applied to the absolute measurement of transplutonium nuclides. Its accuracy is better than±1%.
The absolute intensity of medical isotopes 181I and 198Au with a short half-life has been measured by the efficiency extrapolation method of Aπβ-γ coincidence absorption curve. The result of the measurement has been corrected for background, dead time, resolving time respectively. The correction for the short half-life has also been considered. The maximum error of the measurement are 0.57% and 1.7% for 131I and 198Au respectively. After a little change of the apparatus, we have measured the nuclide with...
The absolute intensity of medical isotopes 181I and 198Au with a short half-life has been measured by the efficiency extrapolation method of Aπβ-γ coincidence absorption curve. The result of the measurement has been corrected for background, dead time, resolving time respectively. The correction for the short half-life has also been considered. The maximum error of the measurement are 0.57% and 1.7% for 131I and 198Au respectively. After a little change of the apparatus, we have measured the nuclide with electron capture decay.
In the experiments 610 rats,some guinea pigs,rabbits anddogs were used to study the therapeutic effect of the Tiron,a kind of che- late,on removing uranium from the poisoned animals received lethal doseof uranyl nitrate.The results showed that the Tiron is significantly superiorto the EDTA and DTPA in removing nuclide from the animals body and isable to reduce the mortality of poisoned animals.in the control groupswithout chelate treatment,90—100% of the poisoned animals died of uran-ium poisoning within...
In the experiments 610 rats,some guinea pigs,rabbits anddogs were used to study the therapeutic effect of the Tiron,a kind of che- late,on removing uranium from the poisoned animals received lethal doseof uranyl nitrate.The results showed that the Tiron is significantly superiorto the EDTA and DTPA in removing nuclide from the animals body and isable to reduce the mortality of poisoned animals.in the control groupswithout chelate treatment,90—100% of the poisoned animals died of uran-ium poisoning within 30 days;but in the treated groups with Tiron,90—100% of the animals have been living throughout all experimental period.The uranium content in the excreted urine of those animals treated withTiron was 2—3 times more than that of the control.But delayed treatmentwith Tiron at 24 hours after administration of nuclide was not so effectiveas the early treatment.The toxicity of the Tiron to the kidney is lower thanthat of EDTA and DTPA.The Tiron's LD_(50)is about 6.0 grams per 1 kgbody weight in mice and in rats.
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