Sealed radioactive sources (SRS) are used worldwide in medicine, research, agriculture
and industry, in mobile as well as stationary devices. The International Basic Safety Standards
for Protection against Ionizing Radiation and for the Safety of Radiation Sources [1] defines a
sealed source as “radioactive material that is (a) permanently sealed in a capsule or (b) closely
bounded and in a solid form. The capsule or material of a sealed source shall be strong enough
to maintain leaktightness under the conditions of use and wear for which the source was
designed, also under foreseeable mishaps”. The activity of such sources varies from a few
kilobecquerel in consumer products to petabecquerel in facilities for irradiation, sterilization
and radiotherapy; the former are relatively harmless whereas the latter may be lethal even
during very brief exposure. A SRS consists of a radioactive material that is encapsulated in a
strong metal housing, typically stainless steel, to ensure containment of the radioactive
material even under extreme conditions. However, old SRS were not manufactured to current
standards and therefore have increased risk of mishap. Note that radiation sources such as
X ray units or ion accelerators do not fall under such definition and are not the subject of this
report.
Sealed radioactive sources (SRS) are used worldwide in medicine, research, agriculture
and industry, in mobile as well as stationary devices. The International Basic Safety Standards
for Protection against Ionizing Radiation and for the Safety of Radiation Sources [1] defines a
sealed source as “radioactive material that is (a) permanently sealed in a capsule or (b) closely
bounded and in a solid form. The capsule or material of a sealed source shall be strong enough
to maintain leaktightness under the conditions of use and wear for which the source was
designed, also under foreseeable mishaps”. The activity of such sources varies from a few
kilobecquerel in consumer products to petabecquerel in facilities for irradiation, sterilization
and radiotherapy; the former are relatively harmless whereas the latter may be lethal even
during very brief exposure. A SRS consists of a radioactive material that is encapsulated in a
strong metal housing, typically stainless steel, to ensure containment of the radioactive
material even under extreme conditions. However, old SRS were not manufactured to current
standards and therefore have increased risk of mishap. Note that radiation sources such as
X ray units or ion accelerators do not fall under such definition and are not the subject of this
report.
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