Radiotherapy is a medical practice that uses ionising radiation for the treatment of cancer. A problem of this type of use of ionizing radiation is how to prevent that the vicinities of the treatment room receive an amount of radiation above the permitted levels. In this work the inverse-square law and the exponential attenuation law of the radiation intensity are used to obtain a basic expression necessary to estimate the thickness of primary barriers in radiotherapy.
inverse-square law; exponential attenuation; shielding; radiotherapy
