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The "top" is a flat metal disk with a small hole drilled near one edge (figure 2-24A); it is placed above an x-ray film or cassette and made to spin while a short exposure is made.
28 sty 2014 · The time-honoured “spinning top” method of checking the accuracy of X-ray timers relies on the pulsed nature of X-ray emission from tubes operating on sing
28 sty 2014 · The time honoured “spinning top” test gives an accurate check for short exposure times, but the dots overlap if a hand spun top is used for times longer than about 0·25 second, and cannot be identified on three-phase and constant voltage generators.
The time-honoured “spinning top” method of checking the accuracy of X-ray timers relies on the pulsed nature of X-ray emission from tubes operating on single phase half- or full-wave rectification. …
If no impulse timer is available, the spinning top can be used for two or three spot checks. A distinct advantage of this impulse counter is that, for experimental work, each exposure can be individually checked, including phototimers.
The time-honoured “spinning top” method of checking the accuracy of X-ray timers relies on the pulsed nature of X-ray emission from tubes operating on single phase half- or full-wave rectification.
The spinning top test is used to evaluate timer accuracy or rectifier failure. With single-phase, full-wave- rectified equipment (120 pulses/s), for example, 12 dots should be visualized when using the 1/10-s time station. A few dots more or less indicates timer inaccuracy.
