Regulation 20 Weight units and categories of qualifying nuclear materials
When any person supplies information under these Regulations, any quantity of qualifying nuclear materials—
must be expressed to at least the nearest gram; and
may be rounded down, when the first decimal is 0 to 4, and rounded up when the first decimal is 5 to 9.
The corresponding accounting records must be kept—
in grams or in smaller units; and
in such a manner as to render them secure and reliable.
Unless otherwise provided for in the particular safeguard provisions, any notification under these Regulations must include the following—
the total weight of the elements uranium, thorium and plutonium, and also, for enriched uranium, the total weight of the fissile isotopes; and
separate reports for each material balance area as well as separate line entries in inventory change reports, material balance reports and in physical inventory listings for each category of qualifying nuclear material.