ECOTEST TERRA-P MKS-05 Operating Manual page 7

Alpha radiation is a flow of nucleuses of helium. It has small permeability and
can be hindered, for example, simply by a piece of paper. Therefore it is not
hazardous until radioactive materials emanating alpha particles get into human
organism either through open wound, or with food and air.
Beta radiation is a flow of electrons. Beta radiation obtains higher permeability
and penetrates organism tissues at the depth of 1-2 cm.
Neutron radiation is a flow of neutrons originating from the process of nuclear
fission in the reactors, or as a result of spontaneous division in the nuclear materials.
Since neutrons are electroneutral particles they deeply penetrate any substance,
including living tissues.
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