What would happen if a hydrogen bomb hit Doncaster?

A map demonstrating how the borough would be affected if a hydrogen bomb was detonated in Doncaster town centre.
A map demonstrating how the borough would be affected if a hydrogen bomb was detonated in Doncaster town centre.

Over 7,000 people would be killed if a hydrogen bomb hit Doncaster, a computer programme has predicted today.

North Korean officials have claimed the country carried out an underground hydrogen bomb test yesterday.

The computer programme, Nukemap, predicts 7,260 fatalities and some 20,040 injuries – if the bomb has a yield of 10 kilotons, as the country claims.

If, in the unlikely event the bomb was dropped in the town centre, the radius of the nuclear fireball would reach a diameter of 0.12 kilometres causing fatalities, taking out the town centre and many of its landmarks including The Mansion House and the Frenchgate shopping centre.

The air blast radius would reach as up to 0.69 kilometres, stretching out towards Bennetthorpe and Thorne Road. The pressure of the blast in this area would cause most buildings to collapse and widespread fatalities.

Radiation would reach almost five kilometres and without medical treatment, there can be would be between 50 per cent and 90 per cent mortality from acute effects alone. Dying would take between several hours and several weeks. People more than 6 kilometres away would suffer third degree burns. Areas such as Hexthorpe, Wheatley Hills, Lakeside, Edenthorpe and Kirk Sandall would also be affected.

Graph colour code:

Yellow - Fireball radius: 200 m (0.12 km²)

Maximum size of the nuclear fireball; relevance to lived effects depends on height of detonation. If it touches the ground, the amount of radioactive fallout is significantly increased.

Red - Air blast radius (20 psi): 470 m (0.69 km²)

At 20 psi overpressure, heavily built concrete buildings are severely damaged or demolished; fatalities approach 100%.

Grey - Air blast radius (5 psi): 0.99 km (3.06 km²)

At 5 psi overpressure, most residential buildings collapse, injuries are universal, fatalities are widespread.

Green - Radiation radius (500 rem): 1.25 km (4.91 km²)

500 rem radiation dose; without medical treatment, there can be expected between 50% and 90% mortality from acute effects alone. Dying takes between several hours and several weeks.

Orange - Thermal radiation radius (3rd degree burns): 1.41 km (6.22 km²)

Third degree burns extend throughout the layers of skin, and are often painless because they destroy the pain nerves. They can cause severe scarring or disablement, and can require amputation. 100% probability for 3rd degree burns at this yield is 8.4 cal/cm2.