Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay, all of which involve emitting particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force.
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The physical concept of jamming could improve predictions of whether cancers are likely to spread.
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For the first time, astronomers have observed the signature of methyl cations in a planet-forming disc.
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Researchers in the US have isolated a ball of turbulence inside a tank of water and sustained it by firing vortex rings from the corners of the tank.
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A new thermoregulating textile keeps its wearers comfortable with a minimal amount of energy input thanks to a conductive polymer that can be modified to adjust how much infrared radiation it sheds.
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A new algorithm can identify where an electric current surge occurred in a power grid. This could make it easier to avoid outages and subsequent equipment failures along transmission lines.
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A radionuclide generator is a device which provides a local supply of a short-lived radioactive substance from the decay of a longer-lived parent radionuclide. They are commonly used in nuclear medicine to supply radiopharmacy. The generator provides a way to separate the desired product from the parent, typically in a process that can be repeated several times over the life of the parent.
Use of a generator avoids the challenge of distributing short-lived radionuclides from the original production site (typically a nuclear reactor) to individual users; the loss of activity due to decay in transit can result in too little being supplied or the need for much larger initial quantities to be sent out (incurring additional production and transport costs). An alternative to generators for on-site production of radionuclides is a cyclotron, though it is uncommon that the same radionuclide can be provided by both methods. It is feasible to have cyclotrons at larger centres, but they are much more expensive and complex than generators. In some cases a cyclotron is used to produce the parent radionuclide for a generator.
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Use of a generator avoids the challenge of distributing short-lived radionuclides from the original production site (typically a nuclear reactor) to individual users; the loss of activity due to decay in transit can result in too little being supplied or the need for much larger initial quantities to be sent out (incurring additional production and transport costs). An alternative to generators for on-site production of radionuclides is a cyclotron, though it is uncommon that the same radionuclide can be provided by both methods. It is feasible to have cyclotrons at larger centres, but they are much more expensive and complex than generators. In some cases a cyclotron is used to produce the parent radionuclide for a generator.
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A linear particle accelerator (often shortened to linac) is a type of particle accelerator that accelerates charged subatomic particles or ions to a high speed by subjecting them to a series of oscillating electric potentials along a linear beamline. The principles for such machines were proposed by Gustav Ising in 1924, while the first machine that was constructed was constructed by Rolf Widerøe in 1928 at the RWTH Aachen University. Linacs have many applications: they generate X-rays and high energy electrons for medicinal purposes in radiation therapy, serve as particle injectors for higher-energy accelerators, and are used directly to achieve the highest kinetic energy for light particles (electrons and positrons) for particle physics.
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Physicists in China have developed a technique for simultaneously measuring the mass and temperature of a single nanoparticle levitating in an optical trap.
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A trio of US astronomers has found compelling evidence for “dark stars” – hypothetical objects powered by the annihilation of dark matter.
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