Terrestrial distribution

McDonald P, Cook GT, Baxter MS, et al. 1992. The terrestrial distribution of artificial radioactivity in south-west Scotland. Sci Total Environ 111 59-82. 

The d- and f-hlock elements originate from nuclear reactions in the cosmos and their terrestrial distribution reflects their chemical properties. 

The geological and extra-terrestrial distribution of amino acids... 

Mason and Tranter performed calculations and alleged that a 1.4% excess of /- over r/-quartz on the surface of Earth is the inevitable consequence of a parity-violating energy difference (PVED). They calculated that the /-quartz is stabilized by lO kT per Si02 unit This allegation is based on a report that there is 50.17% /-quartz and 49.3% r/-quartz in 16,807 samples collected worldwide that is an excess of 1.4% of /-quartz. But a more recent survey of 27,053 samples yields 50.17 % r/-quartz and 49.83 % /-quartz, which is a. 0.39 % excess of r/-quartz. Therefore it is necessary to accept the fact that the terrestrial distribution of optically active quartz crystals is quite random and, consequently, no basis exists for calcula-... 

The terrestrial distribution of all naturally occurring isotopes (those not produced in reactors or particle accelerators of which tritium is an example) is more or less fixed with the average distribution, which is referred to as the natural distribution of the isotopes (Wieser and Coplan 2011 Bergland and Weiser 2011). This list, provided in Appendix A.2, reveals that 99.985% of the natural terrestrial Hydrogen contains no neutrons ( H), whereas 0.015% contains one neutron ( H). 

Arsenic is widely distributed about the earth and has a terrestrial abundance of approximately 5 g/t (4). Over 150 arsenic-bearing minerals are known (1). Table 2 fists the most common minerals. The most important commercial source of arsenic, however, is as a by-product from the treatment of copper, lead, cobalt, and gold ores. The quantity of arsenic usually associated with lead and copper ores may range from a trace to 2 —3%, whereas the gold ores found in Sweden contain 7—11% arsenic. Small quantities of elemental arsenic have been found in a number of localities. 

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