From Light to Ashes: The Aftermath of an Atomic Explosion

Nilim Kashyap Barthakur

Imagine a peaceful morning in your city. People are busy with their day-to-day lives, Children are running off for the school bus, elderly people are drinking coffee with the newspaper, and suddenly, you see a blinding flash brighter than the sun appear in the sky, and after that moment, everything changes.

All the things, including you, vaporise in a fraction of a second.

This is the reality of an atomic explosion. A catastrophic event that unleashes unimaginable power and leaves a lasting scar on any place it touches.

When an atomic bomb explodes, the initial thing that anyone observes is the brightness. It’s not merely bright, it’s dazzling. This is the emission of extreme thermal radiation, achieving temperatures exceeding that of the sun’s surface, approximately 10,000 degrees Celsius (18,000°F). In just a split second, any combustible material within a mile—wood, fabric, or even skin—can catch fire or start to burn.

The centre of the explosion, or fireball, quickly expands, generating a shockwave that travels faster than sound. This unseen barrier of pressurised air demolishes structures, breaks glass, and launches debris like an angry tempest.

In Hiroshima, during the bombing of 1945, the shockwave devastated almost everything in a 1.6-kilometre area. Concrete buildings collapsed, and wooden houses were shattered into fragments. Individuals exposed to the elements might be tossed around like dolls or crushed beneath falling buildings.

However, the devastation continues beyond that. The blast emits a surge of ionising radiation—gamma rays and neutrons—that can permeate human tissue, harming cells at the molecular scale. For individuals near the epicenter, this radiation is frequently deadly within days or weeks, leading to acute radiation syndrome. Survivors are plagued by symptoms such as nausea, hair loss, and internal bleeding, a dire reminder of the unseen threat unleashed by the explosion.

A nuclear bomb functions by harnessing the vast energy stored within small atoms, which are the fundamental components of all matter. It employs a method known as nuclear fission, in which the nucleus of specific atoms such as uranium or plutonium is divided into smaller fragments. This division is initiated by a minor explosion that either compresses the substance or collides atoms, igniting a swift chain reaction.

When each atom divides, it emits a surge of energy manifested as heat, light, and harmful radiation, resulting in a tremendous explosion. This detonation generates a dazzling light, a shockwave capable of demolishing structures, extreme heat that incinerates nearby materials, and unseen radiation that may lead to illness long after the explosion. Essentially, a nuclear bomb releases the energy of a small sun, causing catastrophic effects on everything it encounters.

Being at ground zero of such an explosion means instant death. For instance, a 10-kiloton nuclear weapon, equivalent to the size of the Hiroshima and Nagasaki bombs, would immediately kill about 50%of the people within a 2-mile (3.2 km) radius of ground detonation, according to a 2007 report from a Preventive Defence Project workshop.

Those deaths would be caused by fires, intense radiation exposure, and other fatal injuries. Some of these people would be injured by pressure from the explosion, while most would be exposed to injuries from collapsed buildings or from flying shrapnel; most buildings in a 0.5-mile (0.8 km) radius of the detonation would be knocked down or heavily damaged.

It takes around 10 seconds for the fireball from a nuclear explosion to reach its maximum size. A nuclear explosion releases vast amounts of energy in the form of blast, heat, and radiation. An enormous shockwave reaches speeds of many hundreds of kilometres an hour. The blast kills people close to ground zero, and causes lung injuries, ear damage, and internal bleeding further away.

People sustain injuries from collapsing buildings and flying objects. Thermal radiation is so intense that almost everything close to ground zero is vaporised. The extreme heat causes severe burns and ignites fires over a large area, which coalesce into a giant firestorm. Even people in underground shelters face likely death due to a lack of oxygen and carbon monoxide poisoning.

In the long term, nuclear weapons produce ionising radiation, which kills or sickens those exposed, contaminates the environment, and has long-term health consequences, including cancer and genetic damage. Their widespread use in atmospheric testing has caused grave long-term consequences. Physicians project that some 2.4 million people worldwide will eventually die from cancers due to atmospheric nuclear tests conducted between 1945 and 1980.

The existence of nuclear weapons has a strong impact on the environment. Nuclear war would mean a climate disruption with devastating consequences. The world would fall under a nuclear winter, be subject to a deadly global famine, and be subject to the effects of global warming. The massive columns of smoke generated by a nuclear war would alter the world’s climate for years and devastate the ozone layer, endangering both human health and food supplies.

After the explosion, smoke and dust from firestorms would block sunlight from reaching the Earth’s surface and cause an abrupt drop in global temperatures and rainfall, leading to shorter growing seasons and decreasing overall agricultural production and fish stocks worldwide.

And even though temperatures would drop, a nuclear winter would not reverse the effects of global warming. It would exacerbate some effects, including ocean acidification and damage to the ozone layer. Higher levels of UV radiation would cause widespread harm to humans, animals, and plants.

The socio-economic impacts would also be terrible, with developing countries and marginalised groups the ones that will suffer the most. Nuclear weapons are also a vacuum for financial support: in their development, maintenance, and dismantlement. This is money that could be better spent on funding assets such as green technologies and health facilities.

Nilim Kashyap Barthakur, a student of Communication and Journalism, Gauhati University. email: Nilimkashyap123@gmail.com

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