“…Included in this dose should be that due to adventitious reactions such as that arising 349 from the neutron irradiation (from reactions such as [O [18] (p,n)F 18 ]) of air-born argon, [Ar 40 (n,g)Ar 41 ]. It is also important to consider the doses received by medical staff 350 when handling or being near the high energy sources 351 used in some procedures. Absorbed dose profiles have been measured 352 for P-32, Y-90, Re-188, Lu-177, Sm-153 and Er-169 and analysis of the beam dump in a high energy linear accelerator has revealed 353 the build up of longer-lived isotopes such as Al-26, Ti-44 and Fe-60.…”