Abstract: An electromagnetic radiation monitor for use in close proximity with the human body comprised of an electromagnetic radiation sensor for detecting hazardous radiation levels. The radiation monitor also includes means for shielding the sensor from electromagnetic interference caused by the human body. A single layer of a plurality of lossy materials arranged in a precise, predetermined mosaic pattern is used in conjunction with a shield to prevent interference due to unwanted reflections caused by the shield resulting in a wideband frequency response previously unachievable.