Home / English Posts (page 13)

English Posts

Beta Radioactivity

A beta particle, sometimes called beta ray, denoted by the lower-case Greek letter beta (β), is a high-energy, high-speed electron or positron emitted in the radioactive decay of an atomic nucleus, such as a potassium-40 nucleus, in the process of beta decay. Two forms of beta decay, β− and β+, respectively produce electrons and positrons. Beta particles are a type of ionizing radiation. …

Read More »

Gamma (γ) Radioactivity

Gamma radiation is one of the three types of natural radioactivity. Gamma rays are electromagnetic radiation, like X-rays.  The other two types of natural radioactivity are alpha and beta radiation, which are in the form of particles.   Gamma rays are the most energetic form of electromagnetic radiation, with a …

Read More »

Alpha (α) Radioactivity

Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. The symbol for the alpha particle is α or α2+. Because they are …

Read More »

Positron Annihilation

The positron (or anti-electron also called) is the antiparticle of electron. It has electric charge +1 equal and opposite to the electron, spin 1/2 and the same mass. The positrons were discovered in cosmic rays by Carl Anderson in 1932 (photograph above). Patrick Blackett and Giuseppe Occhialini completed the discovery the following …

Read More »

Radioactive Decay Time Measurement

The exact moment when an unstable atom will decay into a more stable is considered random and unpredictable. What can you do, given a sample of a particular isotope, it is to note that the number of decays follows a precise statistical law.

Read More »

Radon

Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium.

Read More »

Energy Resolution in Gamma Spectrometry

The absorption of the gamma ray inside the scintillation crystal and the production of photo-electrons inside the PMT are essentially random processes, thus the Poisson and Gaussian statistical distribution could be applied to explain the broadening of the lines.

Read More »

Tritium

Tritium, (symbol T, 3H or H-3 also known as hydrogen-3) is a radioactive isotope of hydrogen. The nucleus of tritium (sometimes called a triton) contains one proton and two neutrons, whereas the nucleus of protium (by far the most abundant hydrogen isotope) contains one proton and no neutrons. Naturally occurring tritium is extremely rare on Earth, where trace amounts are formed by …

Read More »

Compton Scattering

Compton scattering is the inelastic scattering of a photon by a quasi-free charged particle, usually an electron. It results in a decrease in energy (increase in wavelength) of the photon (which may be an X-ray or gamma ray photon), called the Compton effect. Part of the energy of the photon is transferred to the recoiling electron.

Read More »