Because of their relatively short effective range (<100μm), α-emitters minimally cross-irradiate surrounding healthy tissue (5).One increasingly popular radionuclide is the in vivo α-particle generator 212Pb, which emits 1 (net) α-particle and 2 β–-particles within its decay chain (Fig....
第5章4-U-Th-Pb U-Th-Pb定年及同位素地球化学示踪 U-Th-Pb定年法Pb-Pb定年法普通Pb定年法(commonLead)Pb同位素地球化学示踪 U,Th,Pb的地球化学特征 ➢U和Th在自然界常以+4形式存在，U4+的离子半径为1.05Ă和Th+4的离子半径为1.10Ă，因此它们的地球化学行为一致(Geochemicalcoherence)。➢在氧化...
One can compare the results of the cross section in the p–Pb and Pb–p peri- ods, and one can compare the results of the electron and the muon decay channels. The cross sections agreed in all cases Table 2 Summary of the contributions to the systematic uncertainty, in percent, for ...
Note that all the intensities are referenced to the FID intensity at tdiff ¼ 0, meaning that the decay of the initial intensity by T1 relaxation is not normalized away. In other words, the fractions do not add up to 1 at longer tdiff. dimensions, and in its latest version, it ...
(10.6 h) and favored decay chain.Of interest,^(212)Pb can be extracted directly from natural thorium,which may be abundant in the mining waste of rare-earth,uranium,etc.Indeed,radioactive thorium waste has been a longstanding environmental challenge that needs immediate action.Developing an on-...
(10.6 h) and favored decay chain.Of interest,^(212)Pb can be extracted directly from natural thorium,which may be abundant in the mining waste of rare-earth,uranium,etc.Indeed,radioactive thorium waste has been a longstanding environmental challenge that needs immediate action.Develo...
Solution of hydrochloric or nitric acid containing Pb-212 is charged into a device which generates Bi-212, which is formed in the decay of lead Pb-212.;EFFECT: simplification of the process of extraction of parent generator isotope Pb-212 from initial material, in which it is made for ...
212Pb-225.28 caused dose-dependent growth inhibition of SUM159 xenografts; 0.30 MBq 212Pb-225.28 was significantly more effective than 0.33 MBq 212Pb-F3-C25 at inhibiting tumor growth (p < 0.01). These results suggest that CSPG4-specific 212Pb-225.28 is a useful reagent for RIT of CSPG4-...
212Po (T1/2= 0.3 µs, Eα= 8.8 MeV). 2,2′,2″,2″‘-(1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetic acid (DOTA)-chelator forms stable complexes with212Pb, but one third of the resulting212Bi can be lost from the DOTA chelator during212Pb decay [12]. Further...
On the other hand, the s-process, occurs over much longer timescales, and in environments with relatively lower neutron densities (n ≤ 101111 cm−3−3) such that the less stable nuclei can undergo beta decay. Observational studies have shown that the astrophysical sites of the s-process ...