# The Radioactive Substances (Hospitals) Exemption Order 1990, Paragraph 2: Conditions


The sum total activity of radionuclides in radioactive material to which article 3(2) above applies kept or used on the premises at any one time shall not exceed—
(a) in the case of technetium 99m, one gigabecquerel;
(b) in the case of all other radionuclides, 100 megabecquerels of which not more than 20 megabecquerels shall comprise radionuclides which are radioisotopes of iodine.

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Source: https://www.legislation.gov.uk/uksi/1990/2512/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/radioactive-substances-hospitals-exemption-order-1990/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.