Provided is a nuclear radiation monitor which has a surface on which are
located separate, visible indicia, such as LEDs or an LCD array, with the
indicia being distributed around an imaginary closed loop, preferably of
circular configuration. The monitor includes a radiation-sensitive
apparatus, including a radiation sensor, and the apparatus is adapted to
create a discharge every time a particle or pulse of radiation strikes
the sensor window with sufficient intensity. The device incorporates
electrical circuitry for causing sequential discharges to energize the
visible indicia in a similar sequence, such that the indicia are
perceived to be in motion around the loop, with a rotational speed
substantially proportional to the frequency of occurrence of the
discharges. Included on the surface is a central area depicting an atom
with at least 3 indicia, such as LEDs or an LCD array, which flash when a
preset threshold is exceeded by the radiation rate. Also included in the
unit is an audible alarm that cycles in sympathy with the flashing
indicia.