A.
The small letter “a” shown on the right shoulder of Symbols Ac-225 and Ac-227 are not to be entered on the Shipper’s Declaration. Please ignore them. The meaning of the small letter “a” is shown as a footnote at the end of Table 10.3.A. It reads: “A1 and/or A2 values for these parent radionuclides include contributions from their progeny with half-lives less than 10 days as listed in the following …..” and it has no direct impact to transportation.

As for the letter “m” found following the Symbols Ag-108 and Ag-110 it must be shown on the Shipper’s Declaration. Radioactive material are unstable material which emits hazardous radiation rays when transforming (decaying). If the activity is strong, the radiation will be equally strong. Some radioactive material is considered not fully unstable but “unstable at a medium level”. These are identitfied by adding the letter “m” for “medium”.