which can be determined fairly easily. It also involves a gonadal dose and marrow dose, which if needed, can be calculated by the radiation physicist. If the ESE of a particular examination was calculated to determine the equivalent whole-body dose, this is termed the effective dose. For example, the ESE of a PA chest is approximately 70 mrem, while the effective dose is 10 mrem. The effective (whole-body) dose is much less because much of the body is not included in the primary beam.