In a position detection system for detecting a position of a terminal apparatus of a radio communications system, a position detection time is shortened using a position detection method for determining signal times-of-arrival between the terminal apparatus and base stations neighboring the terminal apparatus. The adjustable element has an elongate body and an extended body that are movable relative to one another for varying the length of the adjustable element. The housing has an open end and includes a top wall and sidewall, with the top wall and the sidewall together co-operatively defining a cavity. The method may also comprise causing the ion beam to impact a semiconductor wafer.