ionactive.co.uk

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Definitions (175)

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time


In Radiation Protection 'time' is still considered one of the key principles for protection from External Radiation sources of Ionising Radiation . For a given Dose Rate , the exposure from the source can be minimised by minimising the time spent near the source. Whilst this concept is still valid, and in some circumstances its vital, it [..]
Source: ionactive.co.uk

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rem


The rem is the old unit of Equivalent Dose (or more accurately Dose Equivalent ) and is derived by multiplying Absorbed Dose (in Rads ) by a Quality Factor . The modern SI unit is the Gray (Gy). 1 Gy = 100rem. See equivalent dose for a explanation of why the absorbed dose is modified to reflect the relative effectiveness of Ionising Radiations in c [..]
Source: ionactive.co.uk

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atomic number


The number of Protons within an Atom . E.g. Uranium-238 (92) contains 92 protons. Also gives the number of Electrons .
Source: ionactive.co.uk

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atomic mass


The atomic mass represents the total number of Protons & Neutrons in an atom. For example, in the Carbon 14 atom shown above there are 6 (red) Protons and 8 (blue) neutrons packed into the nucleus [..]
Source: ionactive.co.uk

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atom


The constituent of elements - the smallest building block which can combine chemically with other atoms and therefore form compounds.. The atom consists of an electron cloud surrounding a nucleus. The [..]
Source: ionactive.co.uk

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annihilation


Annihilation (Positron - Electron) radiation occurs when an electron (negatively charged) collides with a Positron (positively changed & the electron’s anti-particle). The usual result is the emi [..]
Source: ionactive.co.uk

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alpha particle


A positively charged particle consisting of two Neutrons and two protons which is emitted from Atoms undergoing Alpha Decay . The range of the alpha particle is short (a few cm's in air) and t [..]
Source: ionactive.co.uk

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alara


ALARA: As Low as Reasonably Achievable (social and economic factors being taken into account). This term was introduced by the ICRP and requires that all be reasonably done to lower Radiation exposure [..]
Source: ionactive.co.uk

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alarp


ALARP: As Low as Reasonably Practicable. In essence, ALARP is the UK definition of ALARA , although they are not the same since ALARP suggests a balance between Risk and benefit (UK Case Law), where a [..]
Source: ionactive.co.uk

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agr


Advanced gas cooled reactor of a MAGNOX design using enriched Uranium oxide fuel.
Source: ionactive.co.uk


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