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Types of Exemption
Use of Sealed Radioactive Sources for Teaching Purposes in Schools
The use of radioactive sources for teaching purposes in schools is governed by the Code of Practice on the Use of Radioactive Sources for Teaching Purposes in Schools issued by the Radiation Board.
Tritium Self-luminous Products
Exit Signs
Exemption Policy on Tritium Self-luminous Signs
- The use of tritium signs is only justified by the potential benefit of saving of life and where the use of electrical power is not possible or feasible.
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Subject to (a) being fulfilled and if the aggregate activity of tritium in signs that are securely fixed at specified locations inside any specified premises is 1,000 GBq or less, user / possessor of tritium signs may be granted an exemption which is renewable triennially so that the administrative burdens to the Board can be reduced without unduly compromising the health and safety of the public.
No local disposal of tritium sign is permissible. All such signs are to be returned to the overseas manufacturer when they can no longer serve the dedicated purpose of usage.
Timepieces
Exemption Policy on Tritium Self-luminous Timepieces
Radiation Board has granted exemption to retailers and end-users of self-luminous timepieces that contain gaseous tritium light sources. From the requirements of the Radiation Ordinance, it provides that:
- the total activity of gaseous tritium in each timepiece shall not exceed one gigabecquerel; and
- the total activity of gaseous tritium in all timepieces in the possession of any retailer and end-user shall not exceed one thousand gigabecquerel per premises.
A notice of the exemption has been published in the Gazette.
