کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1879010 | 1042535 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Measurement of the 225Ac half-life Measurement of the 225Ac half-life](/preview/png/1879010.png)
The 225Ac half-life was determined by measuring the activity of 225Ac sources as a function of time, using various detection techniques: α-particle counting with a planar silicon detector at a defined small solid angle and in a nearly-2π geometry, 4πα+β counting with a windowless CsI sandwich spectrometer and with a pressurised proportional counter, gamma-ray spectrometry with a HPGe detector and with a NaI(Tl) well detector. Depending on the technique, the decay was followed for 59–141 d, which is about 6–14 times the 225Ac half-life. The six measurement results were in good mutual agreement and their mean value is T1/2(225Ac)=9.920 (3) d. This half-life value is more precise and better documented than the currently recommended value of 10.0 d, based on two old measurements lacking uncertainty evaluations.
► Measured 225Ac half-life by six methods.
► The result is T1/2(225Ac)=9.920 (3) d.
► 225Ac and its daughter 213Bi are important for targeted alpha therapy.
Journal: Applied Radiation and Isotopes - Volume 70, Issue 11, November 2012, Pages 2608–2614