An illuminating device is described. At least one emitter of visible alignment light installed in the first or the second housing generates one or more alignment light beams which is used to geometrically orient the light emitter relative to the opposite light receiver. An index is used to identify rows having values meeting the implied condition. In this manner, the isolation legs provides an electrical communication path from each pixel to the substrate as each pixel undergoes an internal change in resistance due to absorption of infrared energy. The aggregated silicon powder may be doped with phosphorus, arsenic, antimony, bismuth, boron, aluminium, gallium, indium, thallium, europium, erbium, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, thulium, lutetium, lithium, ytterbium, germanium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, gold, or zinc. A radiation detection method, a kit of parts for implementing the same for example in combination with a suitable programmable device, and associated concepts, are also described.