Pleochroic halo: Difference between revisions

The final characteristics of a pleochroic halo depends upon the initial isotope, and the size of each ring of a halo is dependent upon the alpha decay energy. A pleochroic halo formed from U-238 has theoretically eight concentric rings, with five actually distinguishable under a lighted microscope, while a halo formed from polonium has only one, two, or three rings depending on which isotope the starting material is.<ref>{{cite journal |title=Halos und weitere radioaktive Erscheinungen im Wölsendorfer Fluorit (in German) |journal=Der Aufschluss |volume=61 |pages=107–118 |year=2010 |last=Weber |first=B. |url=http://www.vfmg.de/aufschluss_2-2010_Weber.htm |ref=harv}}{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> In U-238 haloes, [[Uranium-234|U-234]], and [[Radon-226|Ra-226]] rings coincide with the [[Thorium-230|Th-230]] to form one ring; [[Radon-222|Rn-222]] and [[Polonium-210|Po-210]] rings also coincide to form one ring. These rings are indistinguishable from one another under a petrographic microscope.<ref>{{cite journal |last=Pal |first=Dipak C. | title=Concentric rings of radioactive halo in chlorite, Turamdih uranium deposit, Singhbhum Shear Zone, Eastern India: a possible result of 238U chain decay |journal=Current Science |publication-date=10 September 2004 |year=2004 |volume=87 |issue=5 |pages=662–667}}</ref>

#{{cite journal |first=C |last=Schnier |title= Indications for the existence of superheavy elements in radioactive halos |journal=Journal of Radioanalytical and Nuclear Chemistry |publication-date=August 2002 |volume=253 |issue=2 |pages=209–216 |doi=10.1023/A:1019633305770 |year=2002}}.