Geothermal systems occur in a range of crustal settings. The emphasis of this review is on
those occurring in regions of active or recently active volcanism, where magmatic heat at …

Discrete samples of geothermal water have been collected from a network of nine stations
for analysis of radon (222Rn) content. The sampling network consisted of wells that range in …

Controls governing the production of 4 He and 222 Rn in the solid phase as well as
parameters and processes contributing to their transport into the pore fluid are discussed …

The distribution of primordial 3 He in the crust of Italy has been investigated through a
survey of groundwaters, hot-springs, exploration and production geothermal wells. The …

Naturally occurring U and Th series radionuclides have been analyzed in high temperature
brines (~ 300° C, 25 wt% dissolved solids) and associated rocks from two deep geothermal …

A wide range of isotopes in the 238U, 235U, and 232Th decay chains was measured in
geothermal brines collected from two production zones at 1898 and 3220 m in the Salton …

The purpose of this study is to characterize in detail the temporal changes in Rn (radon-222)
concentration in soil gases near fumaroles and clarify its correlation with volcanic …

Experiments were designed to evaluate, in a controlled way, some of the variations that can
be expected in radon concentration in soil due mainly to meteorological factors and to close …

The conflict between energy supply and the environment is one of the critical issues of our
time, and geothermal energy, often touted as plentiful and environmentally benign, has …

In order to sample medium-temperature fumaroles, gases are collected by means of iron or
glass tubings and conveyed to the condensation system through glass dewar tubes. One …