Atomic clocks have been used for decades – but now, even greater precision has become possible: presenting the world's first ...

A top-down view of an experimental thorium-based nuclear reactor from the 1960s. (Photo: Oak Ridge National Laboratory, US Department of Energy) The sands of India are brimming with potential to fuel ...

The first nuclear clock based on thorium-229 shows unprecedented precision and may test if fundamental constants change.

Scientists at JILA in the US have used thorium to make a nuclear clock that is much more accurate and precise than an atomic clock.

A recent breakthrough has paved the way for timekeeping even more precise than the measurements performed by atomic clocks.

相机镜头有辐射，我估计这个问题只有一些摄影的资深玩家才知道，一般的摄影爱好者估计都不是很清楚，所以这里有必要来和大家讲讲这个问题，其实有辐射的镜头主要是一些老镜头，我们知道放射性物质对人体是有危害的，为什么老镜头要加入放射性物质。现在就随我们一起来了 ...

DETROIT (AP) — The federal government has stopped sending hazardous waste to a Michigan landfill from Ohio, a ripple effect ...

对于许多摄影爱好者而言，可能并不清楚相机镜头的辐射问题。事实上，这个问题只有一些资深的摄影玩家才有所了解。因此，在这里，我们将对这个话题进行深入讨论。值得注意的是，主要是一些老式镜头存在辐射问题。众所周知，放射性物质对人体有害，那么为什么还要在老式镜 ...

Authorization to purchase, store, use or dispose of Uranium and Thorium compounds, such as Acetates or Nitrates must be obtained from the Radiation Safety Committee or the Radiation Safety Officer.

of radium–thorium in the centre of spheres of heavy water and beryllium respectively. These sources emit neutrons according to the well-known reactions : and . Since thorium C" emits a γ-ray of ...

The low-energy excited state of thorium-229 (229Th) isotope nucleus has recently gained much attention owing to it being an ideal candidate for ultra-precise nuclear clocks. Building such ...

The team found that the Chang'e-6 soil samples have a lower density than previous samples, indicating a more porous and loosely structured composition. The plagioclase content of the Chang'e-6 samples ...