Ukraine and the world: the challenge of Сhornobyl : on the 20th anniversary of the Chornobyl disaster we are to pay tribute to human heroism and the Ukrainian and world's efforts to eliminate the consequences of the nuclear accident. Let us hand down a safe nuclear technology to our descendants : album : ordered by the Ministry of Foreign Affairs of Ukraine / Сhornobyl Center for Nuclear Safety, Radioactive Waste and Radioecology ; [text prepared by: Valentyna Odynytsia, Svitlana Lynkevych, Larysa Syomina ; translator: Lyudmyla Yevtushenko]