Authorities in Thailand expanded their search Wednesday for a metal cylinder with radioactive contents that has gone missing from a power plant, warning the public that it poses a danger to health.

The 30-centimeter- (12-inch-) long cylinder containing the radioactive material Caesium-137 was discovered missing last Friday from a piece of machinery at a steam power plant in Prachinburi province, 100 kilometers (60 miles) east of Bangkok.

Ake Wongjinda, a public relations officer for the provincial government, said Wednesday that authorities have inspected locations such as junk shops, scrap metal yards, and secondhand stores in Prachinburi and neighboring Chachoengsao province for the 25-kilogram- (55-pound-) cylinder.

Health officials cautioned the public that prolonged direct contact with radioactive material can cause skin rashes, hair loss, canker sores, fatigue, and vomiting.

They said short-term contact with Caesium-137 may not show immediate symptoms but could lead to a higher risk of cancer.

This radioactive cylinder has gone missing from a power plan in Prachinburi province.

Thongchai Keeratihuttayakorn, director-general of the Department of Medical Services, said Caesium-137 has similar physical characteristics to salt and can disperse easily if its container is opened.

He said it is used in devices such as ones measuring humidity or the velocity of liquids.

The cylinder was connected to a 17-meter- (56-foot-) tall silo and used for measuring ash in the silo, said Permsuk Sutchaphiwat, secretary general of Thailand’s Office of Atoms for Peace agency.

Kittiphan Chitpentham, a representative of the National Power Supply Public Co., Ltd., the power station’s owner, said it is not clear whether the cylinder had gone missing by accident.

He said that the company would provide a 50,000 baht ($1,445 USD) cash reward for anyone who can provide information about it. The company said it may have disappeared several weeks ago,

In 2000, illegally disposed canisters containing the radioactive substance Cobalt-60 were found in a junkyard in Samut Prakarn, a suburb of Bangkok.

At least five people were hospitalized after being exposed to radiation when the canisters were opened by the scrapyard workers, unaware of the hazard. The cylinders were believed to have come from a medical X-ray machine.

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