facsimile of a sealed source, the capsule of which has the same construction and is made with exactly the same materials as those of the sealed source that it represents, but containing, in place of the radioactive material, a substance resembling it as closely as is practical in physical and chemical properties

transfer of contained radioactive material from the sealed source to the environment

manufacturer’s unique term (number, code or a combination of these) which is used to identify a specific design of sealed source

insoluble in water, yielding quantities less than 0,1 mg/g in 100 ml of still water maintained at 50 °C for 4 h

helium leakage rate at an upstream pressure of 10⁵ Pa ± 5 × 10³ Pa and a downstream pressure of 10³ Pa or less at a temperature of 296 K ± 7 K (23 °C ± 7 °C)

protective envelope, used to prevent leakage of radioactive material

soluble in water, yielding quantities greater than 0,1 mg/g in 100 ml of still water maintained at 50 °C for 4 h

term applied to sealed sources which, after undergoing leakage testing, meet the acceptance criteria

test used to detect internal, surface and concealed defects or imperfections in materials, using techniques that do not damage or destroy the items being tested

radioactive material sealed in a capsule or associated with a material to which it is closely bonded, this capsule or bonding material being strong enough to maintain leaktightness of the sealed source under the conditions of use and wear for which it was designed