. The American journal of roentgenology, radium therapy and nuclear medicine . nottouch two at once, between which adangerous voltage exists, as say C4 and furnishing AC current atvoltages above 500 volts are not wireddirectlv to house hues, but to transformersthat step down the voltage. This isagain stepped up for .v-ray operation. 242 Possible Dangers in Connection with the Use of X-rays and How to Avoid Them Figure 2 shows such a Hne and regions ofdanger where a grounded middle is part of the 2,000 volt hne is safe fora\_person grounded, except the middle ofthe primary
. The American journal of roentgenology, radium therapy and nuclear medicine . nottouch two at once, between which adangerous voltage exists, as say C4 and furnishing AC current atvoltages above 500 volts are not wireddirectlv to house hues, but to transformersthat step down the voltage. This isagain stepped up for .v-ray operation. 242 Possible Dangers in Connection with the Use of X-rays and How to Avoid Them Figure 2 shows such a Hne and regions ofdanger where a grounded middle is part of the 2,000 volt hne is safe fora\_person grounded, except the middle ofthe primary, which may be safe if con-nected to the case or earthed. Any partof the line between the two transformersis reasonably safe. None of the .v-rav \ery dangerous, or even fatal. Concreteand tile floors are fair conductors, especial-ly when moist. Wood floors may ha^•enails reaching or near conducting 3 shows the circuits in this case. On contact with the line, one-half of thetransformer secondary becomes effectivedrivino; current from the outer terminal R E. Bahth or Conducting Floor Fig. 3. secondary except its middle point can beregarded as free from danger. Most x-ray transformers have theirsecondaries wound in two, four, or moresections and the middle of the systemconnected to the metal transformer may be earthed, or simply stand on amore or less conducting floor. In cithercase, when one comes in contact with the through the body to earth and back to themiddle point of the secondary. When one secondary terminal of thetransformer is grounded instead of themid-point, all parts of the line betweenthat terminal and the tube will be safe totouch so long as the ground is , for the same operating potentialthe uncrrounded terminal n\i11 be twice as I FLooH DAGGER T
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