By Mike Mcrae via Science Alert Headline Image Credit: Erwin Zwaan Art Over the past five years, a sensor keeping count of neutron emissions deep within the rubble of the Chernobyl nuclear power plant has kept track of a gradual spike in activity. The rising count might be nothing. It might even drop back down again, given time. Scientists aren't exactly keen on taking any chances, as the potential for a runaway nuclear fission reaction in the future can't be ruled out until we know what's going on. Unfortunately, the precise location of the decaying material beneath debris and heavy slabs of concrete makes detailed investigations and potential fixes all that more challenging. As reported by Science Magazine's Richard Stone, researchers at the Institute for Safety Problems of Nuclear Power Plants (ISPNPP) in Kyiv, Ukraine, are yet to determine whether the noted rise in neutrons heralds pending disaster, or is more of a storm in a nuclear tea-cup. "There are many uncertainties,"