The production of polonium starts from bombardment of bismuth (209Bi) with neutrons at the Mayak nuclear reactors in Ozersk, near the city of Chelyabinsk in Russia.
The Mayak production facility was top-secret during the cold war and still its operations are classified to a large extent.
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Hear this story where it happened, along with the others around it. Say how many days you have and what you are into, and we put together a route through these places, with a voice guide telling each story as you arrive.
Guide me
Polonium-210 processing facility Sarov, Russia 
The first attempt 24 Grosvenor St, Mayfair, London W1K 4EA, UK 
The sushi place 167 Piccadilly, London, UK 
The assassination 44 Grosvenor Square, Mayfair, London W1K 2HP, UK Photo: P Fletcher, CC BY-SA 2.0 
Boris Berezovsky's office 7 Down St, Mayfair, London, UK 
Getting ill at home 140 Osier Cres, London N10 1RF, UK 
Mayak plutonium-production plant — Nuclear waste tank explosion Unnamed Road, Ozersk, Chelyabinskaya oblast', Russia, 456797 · 2.1 km 
A house for bachelors in the city of Lysva Sovetskaya St., 17, Lysva, Perm Krai, Russia, 618900 · 322 km 
The building of the former office of the Nobel Brothers Partnership in Perm Sovetskaya St., 26, Perm, Perm Krai, Russia, 614045 · 377 km 
Gabdrakhman’s Well or Captain’s Well X3QC+94 Privolzhsky, Republic of Tatarstan, Russia · 744 km 
Museum of Modern Art Frunze St., 159, Samara, Samara Region, Russia, 443010 · 744 km 
Khan's Mausoleum X3J6+J9 Bulgars, Republic of Tatarstan, Russia · 744 km 
Written by Nik Frost
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