Content of Natural Gas Samples from Upper and Middle Devonian Sandstone and Shale Reservoirs in Pennsylvania: Preliminary Data.
in the ground water of Chester County, Pennsylvania.
in groundwater in the German Rhine-Nahe area.
Seasonal variation of radon-222
concentrations in specific locations in Jordan.
Crotts has compared the areas where TLPs have been most frequently sighted to regions where Apollo space missions observed evidence of a short-lived radioactive gas, radon-222
, escaping from the Moon's interior - a clear sign that some type of geological activity was going on.
During the 1980s and early 1990s, elevated concentrations of radium-226 and radon-222
in groundwater wells and tap water were reported in Harris County, Texas, particularly in the northwest.
One isotope, radon-222
, for example, decays very quickly into polonium-218 after it is released from a magma chamber--it has a half-life of 3.
Alpha particles are emitted by certain radioactive atoms such as Uranium-238, Radium-226 and Radon-222
that occur naturally, in minute quantities, in the environment.
While the uranium and radium in fluorosilicic acid are known carcinogens, two decay products of uranium are even more carcinogenic: radon-222
is found virtually everywhere because its predecessors - radium-226 and uranium-238 - are in soil and rocks everywhere.
These observations represented a sequence of decays in a single nucleus, going from radon-222
to polonium-218 to lead-214 to bismuth-214 to polonium-214.
concentrations in the United States--results of sample surveys in five states.