The use of pectin to de-corporate the ingested 137Cs, in children notably, is sometimes proposed, but its administration still remains an open question. At present, the only effective treatment for the decorporation of the ingested 137Cs is the Prussian Blue (Radiogardase). It seems that children are more sensitive to the toxic effects of caesium than the adults. In human beings, 137Cs leads to an immune deficiency, congenital and foetal deformations, an increased of thyroid cancer, as well as neurological disorders. Biological effects of 137Cs on the metabolisms of the vitamin D, cholesterol and steroid hormones were described, but do not lead to clinical symptoms. The cardiovascular system was also perturbed. At lowest dose, 137Cs induces disturbances of wakefulness-sleep cycle, but not accompanied with behavioural disorders. Disorders of bone mineralization and brain damages were also described in human beings.

Even though this element has a large number of isotopes, it has only one naturally occurring stable isotope, 133 Cs. A high dose of 137Cs is responsible for a medullar dystrophy, disorders of the reproductive function, and effects on liver and renal functions. Caesium has at least 39 known isotopes, which is more than any other element except francium.The atomic masses of these isotopes range from 112 to 151. The toxicity of 137Cs is mainly due to its radiological properties. After absorption, the caesium is distributed relatively homogeneously within the body, with a more important load in children than in adults. Nowadays, the health consequences resulting from a chronic exposure to this radionuclide remain unknown. Caesium-137 ( 137Cs) is a radionuclide present in the environment mainly as the result of the atmospheric nuclear weapons testing and accidents arising in nuclear power plants like the Chernobyl accident in 1986.

Caesium137.