radioactive source for eg medical or calibration purposes, in radiation leak-proof container; it is opened by remote control only in its shielded site of operation, radioactive material that is (a) permanently sealed in a capsule or (b) closely bounded, and in a solid form to prevent any dispersion of the radioactive material into the environment, kiirgusallikas, mille ehitus väldib normaalsetes kasutamistingimustes radioaktiivsete ainete igasuguse lekkimise ümbritsevasse keskkonda, kiirgusallikas, mille ehitus välistab nõuetekohasel kasutamisel radioaktiivsete ainete pääsemise keskkonda