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The previous exemption limit of 70Bq/g exempted very little and with many
carriers, including the Post Office, not accepting anything that was
'radioactive', and with others making high charges and additional paperwork for
dealing with excepted packages. The new exemption limits taken from the BSS are
based upon the toxicity of the isotope and are therefore much more realistic for
the low toxicity isotopes used in university research. For example the exemption
limits for C-14 are 10kBq/g (concentration limit) and 10MBq overall limit. It is
only when both these limits are exceeded that a package will be
considered radioactive and come within the scope of the regulations
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