Environmental Engineering

Radon in the Environment by M. Wilkening

By M. Wilkening

Radon was once came across in 1900 however it used to be no longer till the 1950's that an understanding of its strength as a risk to people built. This resulted basically from a reputation of the excessive degrees of publicity for uranium miners. size of excessive concentrations of radon in houses led environmental wellbeing and fitness firms to target radon as a wellbeing and fitness possibility and has ended in crisis from scientists, the clinical occupation and most of the people. it really is during this context that the writer undertook the writing of this ebook. a necessity for a broader figuring out of radon within the normal setting as well as that of interior has develop into obvious. on account that a lot of the author's study has to do with open air radon and its decay items, it sort of feels acceptable to have a e-book to be had stressing reports on open air radon to boot was once that came across interior. This booklet is meant to fill a spot in our wisdom of radon focus within the outdoors surroundings in addition to to supply result of formerly released indoor measurements.

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Radon is sometimes referred to as a "metalloid" an element which lies on a diagonal between the true metals and nonmetals in the periodic table. It has some of the characteristics of both groups behaving similarly to boron, germanium, antimony and polonium in this respect (ref. 5). 1. Radon is readily absorbed on charcoal, silica gel and similar substances, a property which can be used to separate it from other gases. 5'C) (ref. 6). Radon is desorbed from charcoal by heating to 350'C. 2 - 27 The relatively high solubility of radon in water (230 cm3 kg-' at 20°C) accounts for its presence at substantial amounts in certain spring waters.

Sci. , 28 (1957), 680-683. NCRP Report No. 97, Measurement of Radon and Radon Daughters in Air, National Council on Radiation Protection and Measurements, Bethesda, MD, 1988, 15. CHAPTER 4 SOURCE OFRADON IN ROCKSAND SOILS The origin of radon and thoron in the Earth's crust stems directly from the uranium and thorium and their decay products distributed in minute amounts in the ground within a few meters of the Earth's surface. Once formed in or on the rocks and soil particles the radon atoms must reach the air in the soil capillaries before they can be transported to the atmosphere through diffusion or pressure-induced flow.

71(20) , (1966) 4735-4741. 1). Barring any unusual removal of intermediate members of the decay chains from the soil, it is reasonable to expect that the production rates of "'Rn and 220Rnin the soil will be roughly equal also. TRANSPORT PROCESSES The transport of the radon isotopes from the soil to the air is treated in this chapter. Knowledge of the processes involved is of importance in the determination of radon levels in houses, uranium exploration, earthquake prediction, and a more complete understanding of the natural radiation environment.

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