Inscriere cercetatori

Premii Ad Astra

premii Ad Astra

Asociația Ad Astra a anunțat câștigătorii Premiilor Ad Astra 2022: Proiectul și-a propus identificarea și popularizarea modelelor de succes, a rezultatelor excepționale ale cercetătorilor români din țară și din afara ei.

Asociatia Ad Astra a cercetatorilor romani lanseaza BAZA DE DATE A CERCETATORILOR ROMANI DIN DIASPORA. Scopul acestei baze de date este aceea de a stimula colaborarea dintre cercetatorii romani de peste hotare dar si cu cercetatorii din Romania. Cercetatorii care doresc sa fie nominalizati in aceasta baza de date sunt rugati sa trimita un email la

Standardization of 48V

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: Leon Grigorescu, Anamaria Cristina Razdolescu, Maria Sahagia, Aurelian Luca, Constantin Ivan, Daniel Negut

Editorial: Agata Olariu, Kristina Stenström, Ragnar Hellborg, Editura Academiei Romane, Proceedings of the International Conference on Applications of High Precision Atomic and Nuclear Methods , Neptun, Romania, 2-6 September 2002, Ed. Academiei Romane, p.86 - 91, 2005.


48 V decays by positron emission and electron capture processes with a half life of 15.97 d. It was standardized by a special classic variant of the coincidence method. An usual 4π proportional counter- NaI(Tl) scintillator system was used. A complication arose due to a significant 46 Sc impurity. The low energy capture radiations were not registered and the 46 Sc radiations were included in a new simplified decay scheme. The gamma contribution in the 4π counter was determined by an extrapolation procedure. In the gamma channel, an energy window centered on the main 1312 keV γ ray was employed as to eliminate the disturbing effect of a non coincident photon. Even so, summation effects, different for two branches in the decay scheme had to be estimated. ‘Get-out’ summation effects were experimentally estimated and reduced with Pb absorbers. Their effect in the final calculus was of only 0.8%. A combined uncertainty of 1.4% was obtained, mainly from the impurity contribution. Two facts helped for a good standardization: use of a simplified decay scheme and equivalent photon energies for 48 V and 46 Sc.

Cuvinte cheie: 48V, standardization, coincidence method, simplified decay scheme