Up until recently the terrorist threat has not been a subject of serious psychological research. While a fair amount of work has recently been devoted to the psychological and psychiatric consequences of acts of terrorism among direct victims and their family members, much less attention has been given to the perception of the terrorist threat by indirect victims (those who may be exposed to acts of terrorism via the mass media). In the present study we dealt with perception of the radioactive threat. A special questionnaire was designed for this purpose–The Questionnaire of the Terrorist Threat (QTT). This instrument is based on the notion that the perception of terrorist threat can be analyzed from the point of view of three components, dissimilar in their psychological content: cognitive, emotional and behavioral. The QTT is intended to evaluate the content and structure of an individual's awareness of both objective and subjective stressful factors experienced after modern terrorist acts. The basic psychometric properties and factor structure of the QTT are reported in a sample of 387 subjects