The newly measured ionization potential of atomic astatine is discussed and compared with that the recently determined value for polonium other halogens. Regularities in these values are applied to understanding energetics diatomic Some surprises remain.

In the study the activities of polonium 210Po and uranium 234U, 238U radionuclides in moss and lichen samples were determined using the alpha spectrometry. Different lichens and mosses were collected around the Sobieszewo Island (northern Poland) and investigated for potential use as biomonitors for 210Po and 238U deposition. Mosses and lichens have a high efficiency in capturing 210Po and 238U...

2014 Neutron deficient polonium isotopes have been produced through 182W(20Ne, xn) reactions. The characteristics of disintegration of 194Po have been reviewed. Isotopes with masses 193 and 192 have been identified ; an isomeric state could be attributed to 193Po. Tome 38 N~ 20 15 OCTOBRE 1977 LE JOURNAL DE PHYSIQUE LETTRES

The distribution of alpha-radioactivity in the vicinity of uranium and of certain variant radioactive halos in biotite was investigated by the fossil alpharecoil method. Within the limits of the method I could not confirm a previously proposed hydrothermal mechanism for the origin of certain variant halo types due to polonium isotopes.