Halogen means one of the chemical elements chlorine, bromine or iodine.
Bioassay means the determination of kinds, quantities or concentrations, and, in some cases, the locations of radioactive material in the human body, whether by direct measurement, in vivo counting, or by analysis and evaluation of materials excreted or removed from the human body. For purposes of these regulations, "radiobioassay" is an equivalent term.
Semiconductor cleanrooms means the integrated systems, fixtures, piping, partitions, flooring,
Beam axis means a line from the source through the centers of the x-ray fields.
nanomaterial means a natural, incidental or manufactured material containing particles in an unbound state or as an aggregate or as an agglomerate and where, for 50 % or more of the particles in the number size distribution, one or more external dimensions is in the size range 1-100 nm;