PET detects the gamma rays given off at the site where a positron emitted from the radioactive substance collides with an electron in the tissue (Figure 1). In a PET scan, the patient is injected with a radioactive substance and placed on a flat table that moves in increments through a ...
Aims The effects of irradiation (gamma-rays and electron-beams), up to 10 kGy, in the antimicrobial activity of mushroom species ( Boletus edulis , Hydnum repandum , Macrolepiota procera and Russula delica ) differently processed (fresh, dried, freeze) were evaluated. Methods and Results ...
Our first stop is the ancient world, where some of the earliest scientists and philosophers pondered the true nature of this mysterious substance that stimulates sight and makes things visible.Contents What Is Light? Light as Rays Light as Waves Light Frequencies Light as Particles Wave-...
Gamma rays and cosmic rays are high-energy particles and radiation that originate from various sources in the universe, such as supernovae, black holes and even the Big Bang itself. Scientiststheorizethat antimatter should be as abundant as ordinary matter because of the Big Bang, but it's sc...
Does a particle accelerator use dark matter? What is the speed of all electromagnetic radiation? How fast is the speed of light in gelatin? Do gamma rays travel at the speed of light? What is the speed of light in kilometers per hour?
However, there are panels in development which can also make use of UV or infrared light. To make efficient solar panels, it is important to mimic the solar energy received on Earth as closely as possible. A solar simulator accurately replicates sunlight to help scientists test the efficiency ...
A science project can be a great way for you to learn something new, based in fact, by using a testable procedure that can produce the same result every time. Scientists have developed a basic outline -- called the scientific method -- that can be used t
Remarkably, we do know for certain where the crossover happened because scientists can track it. Like all viruses, HIV mutates, and it does so at a constant rate. Scientists can use this rate of mutation to track the history and progress of the virus. Because of HIV's close resemblance ...
scientists performed new measurements of Compton scattering from the proton at the High Intensity Gamma Ray Source (HIGS) at the Triangle Universities Nuclear Laboratory. This work provided a novel experimental approach for Compton scattering from the proton at low energies using polarized gamma rays. ...
X-rays: X-rays are very high-energy light waves. We're most familiar with their use in a doctor's office, but X-rays also naturally occur in space. But don't worry, X-rays can't penetrate from outer space to the Earth's surface. Read more in How X-rays Work. Gamma rays: Gamm...