Abstract: A radiation locator apparatus includes a tuned or tunable radio receiver having an automatic gain control (AGC) circuit that provides a d.c. signal having an amplitude that is a function of the strength of the received radiation. A free running voltage controlled oscillator (VCO) is connected to earphones and produces a sound pitch that varies as a function of the magnitude of the d.c. (AGC) signal. An increase in the sound pitch may indicate an increase in the strength of the radiation received. When the locator is transported in a direction toward the source of radiation, the pitch increases thus guiding the operator to the source. The range of audible pitch may be extended by employing a pulse generator type of VCO since pulse repetition rates less than ten pulses per second are audible as spaced clicks that are equivalent to an extra low range of pitch.