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Table 2 Electrical transformation efficiency (α) of inductor with various interrupters (Additional file 1: ES VII)

From: The skin dose of pelvic radiographs since 1896

  Coil itself mechanical mercury Wehnelt
Transformation efficiency α 0.60 0.45 0.50 0.17
Estimated variability 0.20 0.25 0.20 0.07
  1. α is power available to the load of the secondary circuit divided by that spent in the primary circuit of the inductor (including interrupter)