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T he amount of ionizing radiation used in radiologic examinations requires quantification to ensure that the correct measure of radiation is used to generate the image and to record the patient dose in a way that permits an assessment of the risk. Dosimetric units that are commonly used to quantify radiation in diagnostic radiology include exposure (roentgen), absorbed dose (rad or gray), dose equivalent (rem or sievert), and effective dose (rem or sievert). This article explains the rationale for each dosimetric quantity and clarifies the relationships between them.
W Huda (Mon,) studied this question.