Radioactive elements in the nature

Radioactive elements there are in the nature, but in small quantities. Radioactive elements contain mainly in uranium ores in an earth's crust. There is a radioactive isotope of potassium in the ground contain and isotopes of hydrocarbon ¹⁴C and hydrogen ³H, which are formed in an atmosphere and penetrate from atmosphere to the ground. There are the radioactive substances, which are washed away from ground and rocks in natural waters. These sources are used for the medical purposes. Plants acquire radioactive substances from ground, waters and atmospheres. The isotope of carbon is formed in an atmosphere, from nitrogen under action of neutrons of space radiation. This process we can write with help chemical equition:

It is acquired by plants at photosynthesis. The radioactive substances penetrate to animal organisms with food, water and air, but also are removed with excrement. Therefore their accumulation in an organism does not occur happen.

There is a radioactive radiation everywhere in the nature, where there are radioactive substances, which makes natural radioactive backgraund together with spase radiation. Plants and animals have adapted to this radioactive background, as well as to other physical factors of an environment.

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