The Th was chemically purified after irradiation and measured using high-purity germanium detectors (HPGes) including a low-energy photon spectrometer (LEPS), in order to obtain the gamma ray spectra of Th-234. On the other hand, the thermal neutron flux and epithermal index, i.e., the ...
B、光电效应中,依据光电效应方程E_km=h\gamma -W,可知,光电子的最大初动能由入射光的频率和逸出功决定,与入射光照射时间长短无关。故B错误。 C 、钍_90^234Th 衰变成氡_86^220Rn,可知质量数少12,电荷数少4,因为经过一次\alpha 衰变,电荷数少2,质量数少4,经过一次\beta 衰变,电荷数多1,质量数不...
Depopulation of the isomeric state $^{180}\\mathrm{Ta}^{m}$ by the reaction $^{180}\\mathrm{Ta}^{m}(\\ensuremath{\\gamma},{\\ensuremath{\\gamma}}^{\\ensure... two orders of magnitude known cross sections for ($ensuremath{gamma},{ensuremath{gamma}}^{ensuremath{'}}$) ...
and ..gamma.. spectrometers in singles and coincidence modes. Two isomers were identified... Hirokazu,I Hayakawa,J Hyman,... - 《Physical Review C》 被引量: 0发表: 1980年 DECAY OF /sup 174m/Lu. isomerslutetium 174spectraspinThe energy levels populated by BETA decay of /sup 234/Th ...
RadiochimicaActa25,45-47(1978)© byAkademischeVerlagsgesellschaft,Wiesbaden1978Preparationof230Thand234ThTracersBy Μ.Y.MlRZA,DepartmentofChemistry,UniversityofNigeria,Nsukka,Nigeria(ReceivedJanuary20,1978;revisedApril13,1978)Thorium-230/ Thorium-234/ SolventextractionSummaryMethodsaresuggestedforthepreparation...
The fungal fruit bodies and the soil samples were properly treated and the activity concentrations of the studied radionuclides were measured by gamma spectroscopy. The measured radioactivity levels ranged as follows: Cs-137 from −1 fresh weight (F.W.), Th-234 from −1 F.W., Ra-226 ...
The contour plot of the potential energy surfaces, V(beta,gamma), shows two wells on the prolate and oblate sides which indicate that all thorium nuclei are deformed and have rotational characters. The levels energy, electromagnetic transition rates B(E1) and B(E2) are calculated. Bending at ...
Improvement in the determination of U-238, Th228-234, Ra226-228, Pb-210, and Be-7 by gamma spectrometry on evaporated fresh water samples For the U-Th series radionuclides investigation in natural freshwater, a simple, fast, and not laboratory intensive method which consists of evaporating th...
Several measurements of the absolute emission probability of the 1001keV gamma ray of Pa-234m have resulted in doubts concerning earlier recommended decay data for this radionuclide. While a value of 0.00590卤0.00010 was adopted in previous evaluations, recent gamma-ray studies are in good agreement...
Gamma-ray spectrometry~(234)Th is a naturally occurring radionuclide being the daughter of ~(238)U. This paper presents the results obtained in a new evaluation of the nuclear data characterizing the ~(234)Th radioactive decay. The following decay characteristics have been evaluated: half-life,...