Abstract
Optical images of self-quenching streamers (SQSs) in a gas counter have been observed for /spl alpha/- and /spl beta/-rays, incident charged particles. Individual images of the streamers were obtained by using an image-intensifier system with a gating function. The observation was performed from the axial direction of the gas counter used. For /spl alpha/-ray irradiation, streamers develop only in two specific directions orienting tracks formed by /spl alpha/-rays. On the other hand, for /spl beta/-ray, streamers grow in various directions; obtained images are similar to those for X-rays. On the basis of the observation, SQS-formation mechanisms by different sorts of ionizing radiation are discussed. A possible mechanism of primary-ionization track oriented (PRITOR) type SQS induced by /spl alpha/-rays is proposed. >
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