Pieter Franken affixes the Safecast radiation monitoring unit on a Hong Kong taxi.
Pieter Franken affixes the Safecast radiation monitoring unit on a Hong Kong taxi.
Safecast devised a radiation monitoring unit, containing a Geiger counter and GPS, to be affixed on the window of a vehicle.
Safecast devised a radiation monitoring unit, containing a Geiger counter and GPS, to be affixed on the window of a vehicle.
Alexis Lai/CNN
A handheld device to track the Geiger counter's results while inside the car.
A handheld device to track the Geiger counter's results while inside the car.
A Hong Kong taxi kitted out with Safecast radiation monitoring gear.
A Hong Kong taxi kitted out with Safecast radiation monitoring gear.
The 'pancake sensor' used inside the Geiger counter to measure radiation. Radiation rays collide with the atoms of the gas inside a tube, creating a pulse. The number of counts per minute can be converted into a hourly rate of microsieverts of radiation.
The 'pancake sensor' used inside the Geiger counter to measure radiation. Radiation rays collide with the atoms of the gas inside a tube, creating a pulse. The number of counts per minute can be converted into a hourly rate of microsieverts of radiation.