Internal Targets in the Cyclotron

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Abstract
The large circulating ion current in the cyclotron which ordinarily does not reach the target chamber has been utilized in the preparation in high concentration of extremely active samples of radio-iron and radiophosphorus. By adapting as internal target the probes used in demonstrating the presence of the circulating current, it has been possible to enhance greatly the yields of radioactive materials as compared with those obtained in the usual manner at the target chamber. The construction of the probe, the nature of the circulating current and the manner in which the target material is applied to the probe are discussed. The general applications of the internal target technique are indicated.