Polonium has 42 known isotopes, all of which are radioactive. They have atomic masses that range from 186 to 227 u. 210Po (half-life 138.376 days) is the most widely available and is made via neutron capture by natural bismuth. The longer-lived 209Po (half-life 125.2±3.3 years, longes...
radium CI:214Po actinium A:215Po thorium A:216Po radium A:218Po Table nuclide symbolZ(p)N(n) isotopic mass (u) half-lifenuclear spinrepresentative isotopic composition (mole fraction)range of natural variation (mole fraction) excitation energy ...
A homogeneous blood-thorium sulphate mixture has been used as a source of polonium-216 alpha-particle activity in two determinations of the half-life of this nuclide. The first method consisted of scintillation counting, by means of a scaler and six electro-mechanical registers, of the alpha-...
Polonium-210 (210Po) is typically artificially produced in nuclear reactors by bombarding the stable isotope bismuth-209 (209Bi) (via the (n, γ) reaction, yielding 210Bi, which decays with a half-life of T = 5 days to 210Po) (Health Physics Society, 2008). Determining the atomic mass...
Scientists at the National Institute of Standards and Technology (NIST) have determined* that polonium-209, the longest-lived isotope of this radioactive heavy element, has a half-life about 25 percent longer than the previously determined value, which h
Polonium is a very rare element in nature because of the short half-life of all its isotopes. It is found in uranium ores at about 100 micrograms per metric ton (1 part in 1010), which is approximately 0.2% of the abundance of radium. The amounts in the Earth's crust are not harmfu...
Radon atoms are short lived, having a half-life of 3.8days but are considered to be the most significant contributors to human exposure from natural sources. Inhalation of the gaseous radioactive isotope222Rn causes concern because it has been connected to lung cancer (Abrahams, 2002). Epidemiolo...
half lifenuclear spinparitytotal widthThis document is part of the Supplement containing the complete sets of data of Subvolume E 'Nuclei with Z = 74 - 103' of Volume 25 'Excited Nuclear States' of Landolt-B枚rnstein - Group I ' Elementary Particles , Nuclei and Atoms'. It provides ...
half-lifenuclear spinparitytotal widthThis document is part of the Supplement containing the complete sets of data of Subvolume F 'Supplement to I/25 A-E' of Volume 25 'Excited Nuclear States' of Landolt-B枚rnstein - Group I 'Elementary Particles, Nuclei and Atoms'. It provides properties...
Poloniumhas no stable isotopes, but210Po is one of the products in the decay series of the naturally occurringradioactive isotope238U.210Po has a half-life of 138.4 days, and it is an α-emitter. In the marine environment, some organisms are naturally exposed to very high doses of radiati...