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Nagasaki marks 75th A-bomb anniversary

The city of Nagasaki in southern Japan marks the 75th anniversary of the U.S. atomic bombing on Sunday.
It was the second nuclear bomb dropped by the U.S. three days after the attack on Hiroshima. Japan surrendered on Aug. 15, ending World War II and nearly a half-century aggression against its Asian neighbors.
Dwindling survivors, whose average age exceeds 83, increasingly worry about passing their lessons on to younger generations.
Some questions and answers about that fateful event:
WHY WAS NAGASAKI CHOSEN AS THE TARGET?
Nagasaki was not a primary target. Although it was home to weapons production including torpedoes, its hilly topography and a nearby POW camp for Allies made Nagasaki less desirable. As the B-29 bomber Bockscar headed to its initial target of Kokura on the morning of Aug 9, 1945, thick haze and smoke forced it to switch at the last minute to Nagasaki, a second target. The United States said the bombings hastened Japan's surrender and prevented the need for a U.S. invasion of Japan. But some historians today note Japan was close to surrendering anyway and question the need to use atomic bombs, especially the second one. There is still debate about this in the U.S.
WHAT HAPPENED IN THE ATTACK?
Nagasaki's sky was also hazy, but visibility briefly cleared. At 11:02 a.m., the Bockscar dropped a 4.5-ton plutonium bomb dubbed “Fat Man” from 31,500 feet (9,600 meters). About 30 seconds later, the bomb exploded at 1,640 feet (500 meters) above a tennis court, hitting the mostly civilian district. Under the mushroom cloud that rose as high as 52,500 feet (16,000 meters), the blast destroyed about 70% of the city. Seconds later, the temperature at ground zero rose to 4,000 degrees Celsius (7,200 degrees Fahrenheit). All wooden houses within one kilometer of ground zero were destroyed by the blast and firestorm. About 20 minutes later, “black rain” of highly radioactive particles started falling onto the city, causing additional radiation exposure.
HOW MANY DIED?
An estimated 74,000 people, including those with radiation-related injuries and illnesses, died through Dec 31, 1945. That accounts for about one-third of the city’s population of about 240,000 before the attack. Those within one kilometer from ground zero were killed instantly. As in Hiroshima, most of the victims were civilians, including many children and elderly. To date, the death toll, including those who died subsequently from radiation-related cancers, totals 182,600. Nagasaki's population today is about 407,000.
WHAT ABOUT RADIATION?
Many of those exposed to radiation developed symptoms such as vomiting, hair loss and fatigue. Most of those with severe radiation symptoms died within weeks. Others who lived beyond that also developed health problems related to burns and radiation-induced cancers and other illnesses. Their risk of developing leukemia is 4-5 times higher than the general population. About 25,700 people in Nagasaki, who are certified as “hibakusha,” or atomic bombing survivors, are still alive and entitled to free medical checks and treatment. Government support for the survivors began only after their pressure led to the enactment of a law in 1957.


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