At the door of the control room where the world’s worst nuclear disaster began, a Geiger counter showed radiation of 2.33 microsieverts an hour – well under the 100-microsievert total dose the Chernobyl power plant allows visitors.

Then long-serving plant employee Sergei Parikvash, who saw the reactor explode while fishing in the cooling pond on April 26, 1986, held the counter up to a protective lead plate on the hallway floor. The readings began going up: 5.6, 6.2, 6.4, 6.54 …

Tour groups have become an almost daily sight at the Chernobyl power plant following the hit HBO/Sky mini-series this spring. Now the plant will begin letting visitors into the reactor four control room, where much of…

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