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Health and Safety at Work Act etc. 1974

Ionising Radiations Regulations 1999
Certificate of Approval No TA3 of 1999

1 By virtue of the powers conferred on it by paragraph 1(c) of Schedule 1 to the Ionising Radiations Regulations 1999 ('the Regulations'), the Health and Safety Executive approves the type of apparatus specified in Schedule 1 to this Certificate, subject to the conditions specified in Schedule 2.

2 This Certificate shall remain in force until it is revoked in writing by the Health and Safety Executive.

Signed by

Wendy Bines
(A person duly authorised by the Health and Safety Executive to act in that behalf)

Dated this 22nd day of December 1999.


Schedule 1

1 Ionisation chamber smoke detectors containing not more than 40 kBq Americium-241 in any detector and conforming to all of the requirements for single station ionisation chamber smoke detectors specified in 'Recommendations for ionisation chamber smoke detectors in implementation of radiation protection standards' published by the Nuclear Energy Agency of the Organisation for Economic Co-operation and Development (OECD) 1977.

Schedule 2

1 This type approval shall only apply when the number of such detectors present in any building or premises is less than 500.

2 This type approval shall only apply to ionisation chamber smoke detectors (specified in Schedule 1) kept in any building or premises where work with ionising radiations arises solely from the storage, handling or disposal of such detectors, provided that in no case shall any detector be dismantled.


Explanatory notes for certificate of approval No TA3 of 1999

1 These notes do not form part of the Certificate of Approval.

2 Apparatus specified in the Certificate is type approved for the purposes of Schedule 1 to the Regulations. This means that employers who are working with ionising radiations solely due to the presence of less than 500 such detectors (specified in Schedule 1 to the Certificate) in any building or premises under their control need not notify the Health and Safety Executive that they are working with ionising radiations.

3 The approval does not exempt employers from all other requirements of the Regulations.

4 This approval does not relate to the functional ability of the apparatus.

5 Ionisation chamber smoke detectors installed in premises or a workplace are covered by Certificate of Approval No TA1 of 1999.

6 Note that the Radioactive Substances (Smoke Detectors) Exemption Order 1980 (SI 1980 No. 953 as amended) exempts up to 500 detectors from registration under the Radioactive Substances Act 1993, subject to certain conditions being observed. The exemption order was amended in 1991 by SI 1991 No 477.

7 This Certificate replaces the Certificate of Approval TA1 of 1989 which expires on 31 December 1999.

Updated 2008-12-05