Modern Indian History-Events and Personalities

What is Black Rain?


From UPSC perspective, the following things are important :

Prelims level: Black Rain

Mains level: Hiroshima and Nagasaki Bombings by US

Ahead of the 75th anniversary of Hiroshima, a Japanese court has recognised 84 survivors of the post-nuclear explosion “black rain” as the atomic bomb survivors. This would enable them to avail free medical benefits.

Try this question from CSP 2011:

Q.Acid rain is caused by the pollution of the environment by:

(a) Carbon dioxide and nitrogen

(b) Carbon monoxide and carbon dioxide

(c) Ozone and carbon dioxide

(d) Nitrous oxide and Sulphur dioxide

What is Black Rain?

  • An estimated 69 per cent of the buildings in Hiroshima were destroyed by the atomic bomb.
  • The debris and soot from this, mixed with the radioactive fallout from the bomb, raised high into the atmosphere in the form of a mushroom cloud.
  • This material combined with the vapour in the atmosphere and came down as dark drops of liquid that have been called black rain.
  • Survivors of the black rain described it as consisting of large, greasy drops that are much heavier than normal raindrops.
  • It is full of highly radioactive material, and studies have shown that exposure to it can result in serious illnesses.

What was its effect?

  • A study conducted in the year 1945 itself showed that black rain had come down as far as 29 km away from ground zero.
  • The rain contaminated everything it came in contact with, and dead fish were reported floating in water bodies and severely ill cattle were seen lying in the fields.
  • It has caused acute radiation symptoms (ARS) in many who were exposed to it, with reports of people suffering from nausea and diarrhoea for weeks.
  • Other ARS include fever, sore throat and loss of hair. Over time, many people who were exposed to black rain have developed cancer.

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3 years ago

option (d) for acid rain


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