Approximately 3,000 people work in the Zone of Alienation on various tasks, such as the construction of the New Safe Confinement, the ongoing decommissioning of the reactors, and assessment and monitoring of the conditions in the zone. Employees do not live inside the zone, but work shifts there. Some of the workers work "4-3" shifts (four days on, three off), while others work 15 days on, 15 off. Other workers commute into the zone daily from Slavutych. The duration of shifts is counted strictly for reasons involving pension and healthcare. Everyone employed in the Zone is monitored for internal bioaccumulation of radioactive elements.