| Zugriffsnummer | 43774 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Determination of the activity of Ac-225 and of the half-lives of Po-213 and Ac-225 |
| Autor(in); Institution |
Kossert, Karsten; 6.1, Radioaktivität, PTB-Braunschweig
Nähle, Ole; 6.1, Radioaktivität, PTB-Braunschweig
Takacs, Marcell Peter; 6.1, Radioaktivität, PTB-Braunschweig
|
| Quelle/Jahr | Applied Radiation and Isotopes: 156 (2020) |
| Artikelnummer | 109020 |
| ISSN | 0969-8043 (PRINT) ; 1872-9800 (ONLINE) |
| DOI | |
| Verlag | Amsterdam: Elsevier |
| Freie Schlagworte | Ac-225 ; Po-213 ; TDCR ; Full digital data acquisition ; Activity standardization ; Half-life |
| Zusammenfassung | The activity concentration of an Ac-225 solution was determined by means of liquid scintillation counting using three custom-built TDCR counters. The efficiency calculation was carried out in the same way as it had been done in an earlier article on Th-229. The computation of the counting efficiency is rather complex and requires a correction to allow for the short-lived Po-213. The experimental deadtime was varied to validate the correction. One of the TDCR counters is equipped with a CAEN N6751C digitizer for data acquisition. In addition, the system comprises a CeBr3 solid scintillator as a gamma detector. The offline analysis was used to obtain a time-difference spectrum, using signals from the Po-213 γ-rays at about 440 keV in the gamma channel in coincidence with the preceding beta decay as the start signal, and signals from the subsequent (delayed) Po-213 alpha decays as the stop signal. After fitting an exponential function with a constant background, the half-life of Po-213 was determined to be 3.709(12) μs, which is in good agreement with the evaluated value. The half-life of Ac-225 was determined from long-term measurements using an ionization chamber (IC) and a TDCR system. The combined result was found to be 9.9179(30) d, which is in agreement with the outcome from Pomme et al. (2012). |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |