This application discloses a device adapted for remedying the potentially harmful effect on humans of RF transmissions. The device includes sensing means, such as an antenna (30, Fig. 1) for monitoring radiation generated by an RF emitting device such as a mobile handset. An output signal from the sensing means is input to detecting means (32, 34, Fig. 1). The detecting means includes a first integrator 42 for integrating a sensed transmission signal over a predetermined time interval, a time delay means 38 for feeding the sensed transmission signal to a second integrator 44 for integrating the sensed transmission signal over the same predetermined time interval, and means 48 for comparing the integrated values from the first and second integration means with a threshold in order to determine whether the transmissions have a significant time duration. When it is determined that the transmissions do have a significant time duration, a remedial signal generator (28, Fig. 1) is triggered to generate a noise signal which is used to generate an electromagnetic field in the vicinity of the RF radiation and thus mitigate any potentially harmful effects. This field is sometimes referred to as a confusion field in the prior art. The detector may include a passive detector and an active detector, each performing the integration, delay and compare steps outlined above.
