The invention relates to a kit for detecting \u03b2-radiation on a solid surface in a manner that is not destructive to the solid surface, said kit including at least two films that are sensitive to at least two different types of radiation, including the \u03b2-type. The lighting element has a light guide element that is optically coupled to the light emitting diode and the light guide element has a smaller light exit surface than the light emitting diode. The first control electrode can control entry of charge into a gate semiconductor region in response to a first control signal. Each object is created with context affinity, allowing any thread inside the context to modify the object or process pending messages.