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Strontium-90 (90 Sr) is a fission product with a half-life of 28.8 years and a decay energy of 0.546 MeV. It is a radiation hazard and a bone seeker that can cause bone cancer, leukemia and other health effects.
Half-life is the time required for a quantity to reduce to half of its initial value, commonly used in nuclear physics to describe radioactive decay. Learn how half-life depends on the reaction order, the decay constant and the initial concentration, and see examples of different decay processes.
Ionic radius is the radius of a monatomic ion in an ionic crystal structure. It varies with coordination number, spin state, charge and covalent character of the bonding. Learn how to estimate ionic radii from X-ray crystallography, polarizability, effective nuclear charge and crystal data.
Ray-Ban is a luxury brand of sunglasses and eyeglasses created in 1936 by Bausch & Lomb. Learn about its iconic styles, such as Wayfarer and Aviator, its smart glasses collaboration with Facebook, and its efforts to combat counterfeiting.
Photon counting is a technique to detect and measure individual photons using a single-photon detector. Learn about the advantages, disadvantages, and fields of photon counting, such as quantum information, medical imaging, and LIDAR.
Duty cycle is the fraction of one period in which a signal or system is active. It is used to describe the pulse duration, the power delivery, the neural activity, and the waveform generation in various fields of electronics and biology.
Beam divergence is an angular measure of the increase in beam diameter or radius with distance from the optical aperture or antenna aperture. Learn how to calculate beam divergence, how it affects laser beams, and how it differs from Gaussian beam divergence.
Luxottica is a subsidiary of EssilorLuxottica, the world's largest eyewear company, founded by Leonardo Del Vecchio in 1961. It designs, manufactures, distributes, and retails eyewear brands such as Ray-Ban, Oakley, Persol, and many luxury and designer labels.
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