Abstract: The present invention relates to a novel dosimeter filter and a dosimeter incorporating the same. More specifically, one embodiment of the invention relates to a very thin dosimetry device generally comprising: an optically stimulated luminescent material OSLM (i.e. aluminum oxide) sandwiched between at least two novel CEEC filters, wherein each CEEC filter comprises two layers of filtering material: an electronic equilibrium filter layer and an energy compensation filter layer wherein the electronic equilibrium filters comprise steel and wherein the energy compensation filters comprise Tantalum.

Abstract: The present invention relates to a citizen's dosimeter. More specifically, the invention relates to a small, portable, personal dosimetry device designed to be used in the wake of a event involving a Radiological Dispersal Device (RDD), Improvised Nuclear Device (IND), or other event resulting in the contamination of large area with radioactive material or where on site personal dosimetry is required. The card sized dosimeter generally comprises: a lower card layer, the lower card body having an inner and outer side; a upper card layer, the layer card having an inner and outer side; an optically stimulated luminescent material (OSLM), wherein the OSLM is sandwiched between the inner side of the lower card layer and the inner side of the upper card layer during dosimeter radiation recording, a shutter means for exposing at least one side of the OSLM for dosimeter readout; and an energy compensation filter attached to the outer sides of the lower and upper card layers.