Bolus

Bolus (Latin bolus, from Greek bolos – a piece, a lump) – adaptation used for addition of a form and volume of the part of a body of the patient which is subject to radiation for achievement at radiation of more favorable dozny distribution; it is created individually.

 
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Blood of the person "runs" on vessels under huge pressure and at disturbance of their integrity is capable to shoot of distance to 10 meters.