The experiment was done at beam port 2 at the safari-1 nuclear research reactor the object was placed as close as possible to the scintillator screen to minimise geometric unsharpness and to improve the geometric resolution to 0.088 mm/silce as standard practice the neutron transmission projections of The object were made at every 0.96 rotation interval through 360 thus giving 375 Projection the exposure time for each projection was 25 s at 12bit effective dynamic range of the 16-bit andor ccd camera system the radioactivity build-up during the three hour scans took seven days to decay during which time the object was kept in a shielded safe a certificate was issued with the sample which declared it clear of any radioactivity