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Personal shielding includes lead aprons (such as the familiar garment used during dental x-rays), thyroid shields, and lead gloves. There are also a variety of shielding devices available for laboratory equipment, including lead castles , structures composed of lead bricks , and lead pigs , made of solid lead or lead-lined containers for ...
In x-ray facilities, walls surrounding the room with the x-ray generator may contain lead shielding such as lead sheets, or the plaster may contain barium sulfate. Operators view the target through a leaded glass screen, or if they must remain in the same room as the target, wear lead aprons.
The Sri Lankan Rupee (Sinhala: රුපියල්, Tamil: ரூபாய்; symbol: රු (plural) in English, රු in Sinhala, ௹ in Tamil; ISO code: LKR) is the currency of Sri Lanka. It is subdivided into 100 cents ( Sinhala : සත , Tamil : சதம் ), but cents are rarely seen in circulation due to their low value.
The nation's largest dental association said Thursday it will no longer recommend the use of lead aprons and thyroid collars on patients who are getting dental X-rays. There are two main reasons ...
Won was introduced in 1902 as the official currency unit replacing yang at 1 won = 5 yang. The Bank of Korea was established in 1909 but soon after in 1910 Imperial Japan annexed the Korean Empire. Under Colonial rule, the country was made to use the currency unit "yen" in place of the Korean Won, which took over the Korean won at par.
After the division of Korea, North Korea continued using the Korean yen for two years, until the Central Bank of the Democratic People's Republic of Korea was established on 6 December 1947 and the first North Korean won was issued. [3] In February 1959, the second North Korean won was introduced, equal to 100 old won.
At the time of its introduction in 1945 the won was pegged to the Japanese yen at a rate of 1 won = 1 yen. In October of the same year the anchor currency was changed to the US dollar at a rate of 15 won = 1 dollar. Toward the end of the Korean War the won was devalued at 6000 won = 1 dollar. [1]
Due to the devaluation of the first South Korean won (from 15 won to the U.S. dollar in 1945 to 6000 won to the dollar in 1953), the hwan was introduced in 1953 at the rate of 1 hwan = 100 won. The hwan was nominally subdivided into 100 jeon but the lowest denomination issued was 1 hwan.
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