5 MN1007-C
Glossary
ATEX European Directive 94/9/EC applicable to equipment used in hazardous environments.
From French “Appareils destinés à être utilisés en ATmosphères Explosives”
Alpha radiation Radioactive decay resulting in the emission of a helium nucleus (e.g. Ra-226 Rn-222)
Background radiation The ionising radiation constantly present in the natural environment of the Earth, emitted
by natural and artificial sources
Baseefa A notified bod
for ATEX approval
Beta radiation Radioactive decay resulting in emission of an electron or positron (e.g. Pb-210 Bi210)
Bq/cm
A measure of surface activity. One Becquerel is equivalent to one disintegration per
second.
cpm
Radiation activity measured in counts per minute
cps
Radiation activity measured in counts per second
CSA North American product approval body
EMC Electromagnetic Compatibility
Gamma radiation Radioactive decay in which a high energy photon occurs along with the decay particle(s)
(e.g. 47KeV γ Pb-210 Bi-210)
IP rating
Level of Ingress Protection against objects and liquid
IS
Intrinsically Safe. Design concept, formally assessed and certified by a notified body,
which demonstrates that the instrument can be used safely in hazardous environments.
Isotope Member of an element group with the same number of protons but differing number of
neutrons in its nucleus.
LSA Low Specific Activity
NaI Sodium Iodide – scintillation crystal
NORM Naturally Occurring Radioactive Material
Nuclide A member of the set of approx. 3100 elements and their isotopes
RPA
Radiation Protection
dvisor. A qualified expert who advises on safe and compliant use
of Ionising radiations according to the Ionising Radiations Regulations 1999 (IRR99)
RPS
Radiation Protection Supervisor. An individual appointed to ensure compliance with local
rules and radiation regulations under IRR99
RSO
Radiation Safety Officer
Scintillator Material which produces photons in response to incident radiation
µSv/h Micro-sieverts per hour. SI units for effective dose rate
µR/h Micro-roentgen per hour. Non-SI units for dose rate used in USA
Table 1 - Glossary
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General