. The American journal of roentgenology, radium therapy and nuclear medicine . ly discussed in a separate paperpublished in the current nrmiber of the Reviewby one of the authors. Briefly, it is a hot-cathode tube with a cm. (3M in.) cathode has been especiaUy designed togive a focal spot mm. (3^ in.) in diameterand with a very uniform distribution of target consists of a small wrought-tung-sten button set in a solid block of copper, andthis block is electrically welded to a solid cop-per stem cm. {^A in.) in diameter which ex-tends out through the anode arm to
. The American journal of roentgenology, radium therapy and nuclear medicine . ly discussed in a separate paperpublished in the current nrmiber of the Reviewby one of the authors. Briefly, it is a hot-cathode tube with a cm. (3M in.) cathode has been especiaUy designed togive a focal spot mm. (3^ in.) in diameterand with a very uniform distribution of target consists of a small wrought-tung-sten button set in a solid block of copper, andthis block is electrically welded to a solid cop-per stem cm. {^A in.) in diameter which ex-tends out through the anode arm to an exter- Translations and Abstracts 311 lal radiator. A platinum sleeve is silver-sol- tered at one end to the copper stem and at-iched at the other end to the glass of theknode arm. The target, complete vnth. stemknd radiator, weighs 860 gms. and has a heatcapacity of 81 calories per degree present standard solid tungsten target, noE»Te£M KAY TUBE MIUI-AMMCTEII ttKurean my THANsnuMCK- jiO£/(T6£fl HAY SIVITCH-^ FILAHLHT —rI LAM EST zoifrscL. Fig. 3. Complete Wiring Diagram. complete -^-ith moh^bdenimi stem and iron sup-porting tube, has a heat capacity of less than10 calories. Because of its greater heat capacity,it takes much longer to heat the radiator typeof target to redness than it does the sohd ttings-ten target. Unlike the latter, the target in thenew tube, even at relatively low temperatiires,cools rapidly in the interval between radio-graphic expostu-es, and, therefore, permits ofstarting each exposure with an essentially coldtarget. As a result the focal spot, even thoughsmall, is kept from reaching a temperature highenough to allow inverse current to passthrough the tube. Furthermore (and this ser\-esas an additional safeguard), this type of tubedoes not allow an appreciable amount of in-verse oirrent to pass even though it is so bad- ly overloaded that the focal spot becomes heat-ed to the melting point. A probable explanationof thi
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