6) α-decay chain α衰变链 1. The properties of nuclei ~(287)115 and it sα-decay chain are studied with the macroscopic-microscopic (MM)model and the relativistic-mean-field(RMF)model. 用宏观-微观模型和相对论平均场模型考察研究了最近在俄罗斯研究合成的新核素~(287)115及其α衰变链上的...
It occurs in secular equilibrium in the decay chain of natural uranium at a concentration of 17 ppm. The isotope U232 can thus also be produced from two successive neutron captures in Th230: 0 n1 90Th230 90Th231 90Th231 25.52h 1e0 91 Pa...
In nature, virtually all thorium is found as thorium-232, which undergoes alpha decay with a half-life of about 14.05 billion years. Other, trace-level isotopes of thorium are short-lived intermediates of decay chains. Thorium is estimated to be about four times more abundant than uranium in...
The crystal bar process (or Iodide process) was discovered by Anton Eduard van Arkel and Jan Hendrik de Boer in 1925 to produce high-purity metallic thorium.[36] The name ionium was given early in the study of radioactive elements to the 230Th isotope produced in the decay chain of 238U ...
Thorium-232 undergoes natural disintegration and eventually is converted through a 10-step chain of isotopes to lead-208, a stable isotope; alpha and beta particles are emitted during this decay. One intermediate product is the gas radon-220, also called thorium emanation or thoron. Thorium and ...
Gamma-spectrometric analysis of high salinity fluids - how to analyze radionuclides of the thorium decay chain far from radioactive equilibrium? Applied Radiation and Isotopes 69 (11), 1613-1617.Degering, D., Kohler, M., Gammaspectrometric analysis of high salinity fluids - how to analyze ...
(220Rn) from the233U decay chain. Reprocessing of thorium-based fuels would pose quite a few challenges that are unique to Th–239Pu and Th–233U MOX fuels. Thoria dissolution would be in the presence of sodium fluoride or HF as catalyst on account of its inertness. Reprocessing would ...
The most stable isotope, 232Th, has a half-life of 14.05 billion years, or about the age of the universe; it decays very slowly via alpha decay, starting a decay chain named the thorium series that ends at stable 208Pb. On Earth, thorium and uranium are the only significantly radio...
Protactinium-230 (t1/217.4 days) is a source of the α-emitters uranium-230 (t1/220.8 days) and thorium-226 (t1/231 min). Sorption of protactinium-230 on TRU resin (or on another suitable resin), followed by elution of the decay products from the resin may be used to make these radi...
I.M. Reinitz, K.K. Turekian, The behavior of the ura- nium decay chain nuclides and thorium during the £ank eruptions of Kilauea (Hawaii) between 1983 and 1985, Geochim. Cosmochim. Acta 55 (1991) 3735^3740.Reinitz IM, Turekian KK(1991) The behavior of the uranium decay chain ...