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Plastic nuclear track detector (PNTD), which can make visible the track of an ionizing charged particle, has been used widely as a radiation detector'. Particularly, with the advantage of its smallness and simplicity, this detector has been applied to space radiation dosimetry in past lowearth-orbit missions2). Space radiation consists mainly of heavy charged particles8) and the PNTD is considered to be suitable for detection of high LET components with LET greater than several keY jzm-l. When an ionizing particle passed though the PNTD, the energy will be transferred to the electrons along the track, which results in the trail of damaged molecules. This trail will form a pit on the PNTD surface by being etched in a strong base or acid solution. The pit can be made large enough to be visible with a microscope. The PNTD, however, cannot detect entire particles having the LET of more than the threshold value. A track that makes a low angle on the surface can be erased in etching process; the incident angle must exceed a critical angle (O) to be detected. Although the O value can be theoretically derived through geometric approximation', it is hoped to confirm the validity of this O through ground experiments. Also, we need to recognize that the observed shape of an etchpit could change for a particle having low incident angle close to the O. The image of an etchpit ellipse is affected by experimental conditions such as the normal-surface damage of PNTD, the adjusted condition of a microscope, and the mathematical program used for image analysis. However, very limited experimental data are available on the incident-angle dependency of the PNTD track formation sensitivity9).

Incident-Angle Dependency Found in Track Formation Sensitivity of a Plastic Nuclear Track Detector (TD-1).