L3 Science Extended Key Vocabulary by Roberto Sacco

Sintering

sacco — 2017-02-09 10:37:16 UTC

to cause to become a coherent mass by heating without melting

Sensor

sacco — 2017-02-09 10:42:52 UTC

a device that responds to a physicalstimulus (as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control)

Transducer

sacco — 2017-02-09 10:44:51 UTC

a device that is actuated by power fromone system and supplies power usually in another form to a second system transducer that transformselectrical signals into sound energy

Activity of a radioactive source

sacco — 2017-05-12 13:40:22 UTC

The activity of a radioactive source is the number of ionising radiations it emits per second. Activity is measured in becquerels. The symbol for the becquerel is Bq. One becquerel is one ionising radiation emitted per second, i.e. an alpha, a beta particle or a gamma ray emitted per second.

Radioactive Decay

sacco — 2017-05-12 13:55:26 UTC

Radioactive decay (also known as nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of Internal conversion. A material containing such unstable nuclei is considered radioactive.

Radioactive source

sacco — 2017-05-12 14:04:06 UTC

A radioactive source or radiation source is a sample of a radionuclide, and emits ionizing radiation (one or more of gamma rays, alpha particles, beta particles, and neutron radiation).

Random

sacco — 2017-05-12 14:11:28 UTC

Random is a term used in mathematics (and less formally) to mean that there is no way to reliably predict an outcome (to know what will happen before it happens) or sense a pattern. Something that is chosen at random is not chosen for any conscious reason, and therefore thought to be purely by chance.

Half-life

sacco — 2017-05-12 14:41:11 UTC

Half-life (abbreviated t_1⁄2) is the time required for a quantity to reduce to half its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.