Actinium is a chemical element; it has symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in …

Unlike most of our other acrylic cubes, this microscopic sample of actinium comes with a relatively short expiration date. Prepared in 2020 the last of its atoms will be torn apart within another century or so.

2016年8月17日 · Here we overcome these challenges and characterize actinium in HCl solutions using X-ray absorption spectroscopy and molecular dynamics density functional theory. The Ac–Cl and Ac − O H 2 O...

2025年1月21日 · Explore the unique properties and potential uses of actinium, illustrating its significance through real-world examples. Delve into the atomic structure, preparation, and safety considerations surrounding this radioactive element, highlighting its role in advancing technology and health sciences.

2025年2月10日 · A “cold” actinium-free surrogate sample was prepared that enabled us to identify the contaminants introduced by the storage of an acidic solution in a stainless-steel container as well as characterize the process performance without losing the valuable and rare 227 Ac radionuclide to destructive ICP assays.

2023年6月30日 · Samples of actinium quickly decay to thorium and francium. The longest-lived isotope (Ac-227) has a half-life of 21.8 years. The element is obtained as an impurity in pitchblende, an ore mined for its uranium content. One-tenth of one gram of actinium can be recovered from 1 ton of pitchblende!

A ton of pitcheblende contains about 0.15 milligrams of actinium. Nowadays, actinium is generally produced by the neutron irradiation of 226 Ra. Isotopes: Actinium has 29 isotopes. All are radioactive. 227 Ac occurs naturally in uranium ore and, at …

2003年2月7日 · Sample from the Everest Set. Up until the early 1990's a company in Russia sold a periodic table collection with element samples. At some point their American distributor sold off the remaining stock to a man who is now selling them on eBay.

Debierne may have worked with Marie Curie during the actinium’s discovery as the pitchblende sample used by him was the one from which radium and polonium had already been extracted by the latter [4]. Actinium glows blue in the dark as a result of ionization of gases in the air caused by its radioactivity [4].

2020年2月21日 · Original file (2,400 × 3,000 pixels, file size: 8.24 MB, MIME type: image/png) Actinium-225 medical radioisotope held in a v-vial at ORNL. The blue glow comes from the ionization of surrounding air by alpha particles. This file is licensed under the Creative Commons Attribution 2.0 Generic license.