. La rivista americana di roentgoenologia, radioterapia e medicina nucleare . 0 CnWater 15015.o 14.8 M 03 12.7 12.612 8 12.-0 86.4 (hj 8 per (antDepth- Intcnsiu 21) 228.4 183.7 15-74 29.o 28.87 21 .421.8 138.0 15 4 22.0 21.73 18.o 17.8 107.3 16.71 l8.0 i 15 17.28 18.20 Tabl e XV PERCENTUALE DI PROFONDITÀ-INTENSITÀ INFERIORE a 10 CM. DI ACQUA - MACCHINA A CORRENTE CONTINUA A POTENZIALE COSTANTE - 200 KV. 2 MA. Con 0.5 mm. Filtro in rame da 1.0 mm. Tempo (sec.)tempo (sec.) filtro in rame t-- /C ., , v .- vi .111 : meno di 10 l-m. W itnout W ater ,.- . ater percentuale profondità-intensità tempo (SecWithout W -iter
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. The American journal of roentgenology, radium therapy and nuclear medicine . 0 CnWater 15015.O 14.8 M 03 12.7 12.612 8 12.-0 86.4 (hj 8 Per (antDepth- Intcnsiu 21) 228.4 183.7 15-74 29.O 28.87 21 .421.8 138.0 15 4 22.0 21.73 18.O 17.8 107.3 16.71 l8.0 I 15 17.28 18.20 Tabl E XV PERCENTAGE DEPTH-INTENSITY UNDER 10 CM. OF WATER- -CONSTANT-POTENTIAL CONTINUOUS-CURRENT MACHINE — 200 KV. —2 MA. With 0.5 Mm. Copper Filter With 1.0 Mm. Copper Filt er t-- /C Time (Sec.)Time (Sec.) ., , v .- vi .111 : Under 10 L-m. W itnout W ater , .- . ater Percentage Depth-Intensity Time (SecWithout W -iter Time (Sec.) Under 10 Cm. Water Percentage Depth-Intensity 10.0 64.2 is 6 91 0 10.210.6 15.8 15 6 10.210.810.7 66 6 .5 8 15616.1 92.8 10.610.610.6 65 2 16 015.6 15.6 10.610.610.6 ■4 5 15.715.416.0 90.5 Mean 10.51 65 .08 16. 17 15-73 9*-45 17.22 88 High Voltage X-Ray Work composition of the beam of x-rays is notexactly the same in the two cases and thatthe ratios of scattering to absorption in thetwo media, copper and water, are different. LfAO BOOTH CAO JUJMIHUM UHIHO. Fic. 11 G. Effect of Electrical Characteris-tics of High Tension Supply Cir-cuit on Behavior of X-Ray Tube 2. High Voltage Transformer with NoAuxiliary Rectifying DeviceTwelve new Universal type tubes weretaken just as they came from the factoryand were operated at140, 000 volts (max.) onan interrupterless ma-chine with resistancecontrol. They all ransmoothly. The rectifyingswitch was then stoppedand the tubes were oper-ated directly from thetransformer on alternat-ing current, care beingtaken to use a very lowmilliamperage so that thefocal spot should notbecome too hot and thatthe inverse should not become appre-ciably higher than the useful voltage. Under these conditions ten of thesetubes ran nicely on alternating current. The 1. Interrupterless Machine, with Resistance other two suffered a rapid impairment of vs. Auto-Transjormer Control With high voltage operation on theinterrupterless machine, resistan
