Device for measuring vital parameters by means of advantageous radiation guidance

The invention relates to a positioning and exposure device (1) for a defined arrangement on at least one body part (2, 3) of a living being (4) and for exposing the body part (2, 3) to radiation in order to determine at least one vital parameter of the living being (4). The positioning and exposure device (1) comprises at least: a guide and support structure (6) for delimiting an examination region (8) in which the body part (2) can be positioned during exposure, the guide and support structure (6) forming at least one radiation input region (12) in a portion (10) delimiting the examination region (8), wherein radiation can be introduced into the examination region (8) through the radiation input region (12) and wherein the guiding and supporting structure (6) forms a radiation exit region (16) in a further portion (14) delimiting the examination region (8), wherein at least a part of the radiation that can be introduced into the examination region (8) through the radiation input region (12) can be guided out