after having placed the fluorescent tube in scanning mode the timer was used to measure the time required for 40 scans both with lowest and highest scanning speed each distance of scanning was recorded also the power distribution along the axis of the fluorescent tube was also measured ______________________________________ temps sec 40scan distance scans speed cm sec______________________________________18 13 55 3828 18 62 2240 24 66 66______________________________________ in fig6 11 the detector area is 2 84 cm 2 the scanner speed is the lowest available speed u2248 55 38 cm s the fan ventilator is set to the minimum and the tube temperature is 41 u00b0 c fig6 shows the dependence of the light intensity of a fluorescent tube to distance from the longitudinal axis of the tube taking the 11 5 cm mark of the centimeter scale as origin fig7 shows the dependence of the light intensity of the same fluorescent tube to distance from the longitudinal axis of the tube taking 0 cm as the origin fig8 shows the light intensity distribution along the length of the fluorescent tube to obtain the time dependence of the light intensity at a particular location when the fluorescent tube is scanning reciprocating at a particular speed one has to convert the centimeter scale x scale of fig1 and 2 to a time scale by dividing the distance with the corresponding speed fig9 shows the time dependence of the light intensity at a particular location when the tube is scanning reciprocating with the lowest speed u2248 55 38 cm s and the shortest scanning distance 18 cm fig1 shows the time dependence.