. Radiography and radio-therapeutics . .On the lower reading each one-fifth part of a milliampere is clearly registered,while on the higher reading each division of the scale represents two milli-amperes. In all ordinary work only one or two milliamperes are utilised ARRANGEMENT OF APPARATUS 409 through the focus tube, so that the lower reading serves admirably, whilefor very heavy, discharges the higher reading iscalled into use. The milliamperemeter enablesthe operator to estimate approximately thehardness of the tube, as the variations may bedetected by the fluctuations of the recordingneed
. Radiography and radio-therapeutics . .On the lower reading each one-fifth part of a milliampere is clearly registered,while on the higher reading each division of the scale represents two milli-amperes. In all ordinary work only one or two milliamperes are utilised ARRANGEMENT OF APPARATUS 409 through the focus tube, so that the lower reading serves admirably, whilefor very heavy, discharges the higher reading iscalled into use. The milliamperemeter enablesthe operator to estimate approximately thehardness of the tube, as the variations may bedetected by the fluctuations of the recordingneedle. As the tube hardens the amount ofcurrent passing through diminishes and viceversa. In treatment it may be used as a guideto the length of the exposure if care has beentaken to note the condition of the tube in re-gard to hardness and quantity of current whena particular dose is being given. The Qualimeter is a useful adjunct to atreatment outfit, enabling one at a glance toestimate approximately the degree of hardness of the Fig. 324.—Milliamperemeter.(Siemens.)
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Keywords: ., bookcentury1900, bookdecade1910, bookidradiographyr, bookyear1919
