. The principles and practice of roentgenological technique . Fig. 133.—Bauer Qualimeter. The two horizontalplates act as a condenser. The vertical plates(shaded) are immovable and between them thereswing the two wings, one of which carries apointer (not shown). than between blunt. For accurate determina-tion, the spark lengths should be measuredbetween balls mm., in diameter accordingto standardization rules of the A. I. E. E.(Fig. 132.) The penetrating power or hard-ness of the x-ray is proportional to the squareroot of the spark gap. 180,000 volts should give rays having apenetration o
. The principles and practice of roentgenological technique . Fig. 133.—Bauer Qualimeter. The two horizontalplates act as a condenser. The vertical plates(shaded) are immovable and between them thereswing the two wings, one of which carries apointer (not shown). than between blunt. For accurate determina-tion, the spark lengths should be measuredbetween balls mm., in diameter accordingto standardization rules of the A. I. E. E.(Fig. 132.) The penetrating power or hard-ness of the x-ray is proportional to the squareroot of the spark gap. 180,000 volts should give rays having apenetration of the gamma rays of radium C,which is only one-half absorbed by six centi-meters of lead. X-rays have been experimen-tally produced with voltages as low as 200 to1,060. The committee on standardization of the. 134.—Bauer QuaUmeter, showing the scaleon which the pointer attached to the movablewings indicates the potential of the high tensioncurrent in terms of absorption of x-rays by I-IOmm. of lead. The instrument must be hung sothat it is always in the vertical position, at aminimum distance of twelve inches from anyelectrostatically charged substance.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
