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In page Super-Kamiokande:

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Super-K is located 1,000 m (3,300 ft) underground in the Mozumi Mine in Hida's Kamioka area.[1][2] It consists of a cylindrical stainless steel tank that is 41.4 m (136 ft) tall and 39.3 m (129 ft) in diameter holding 50,220 tonnes (55,360 US tons) of ultrapure water. The tank volume is divided by a stainless steel superstructure into an inner detector (ID) region, which is 36.2 m (119 ft) in height and 33.8 m (111 ft) in diameter, and outer detector (OD) which consists of the remaining tank volume. Mounted on the superstructure are 11,146 photomultiplier tubes (PMT) 50 cm (20 in) in diameter that face the ID and 1,885 20 cm (8 in) PMTs that face the OD. A Tyvek and blacksheet barrier attached to the superstructure optically separates the ID and OD.[citation needed]