/Docs/OTF/org/iaea/GSR3/Footnote/30.md
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Footnote 30
For categories 1, 2 and 3 sealed sources as defined in Schedule II, the manufacturer may consider placement near the source, preferably on the shield or near the point of access to the source, of the supplementary symbol specified in Ref. [17]. The supplementary symbol is not placed on the external surfaces of transport packages, freight containers or conveyances or on building access doors.