A composition comprises a condensation reaction catalyst, a polyorganosiloxane having an average, per molecule, of at least two hydrolyzable substituents, a crosslinker, and a thermally conductive filler. The means for ac-tuating the blade arm include a spiral groove disc rotatably bearing-mounted alongside the annular blade carrier, featuring a spiral groove and a transition fin extending from the blade arm to the spiral groove, as well as elements for rotating the annular blade carrier and the spiral groove disc at a desired rotation speed ratio relative to each other. The predetermined crank time is a function of a magnitude of a difference between the output voltage and the crank undervoltage threshold. Borehole environs are irradiated with neutrons, and induced gamma radiation is measured using a YAP scintillation detector. This CMOS image sensor is particularly advantageous since it can be produced without requiring a special manufacturing process and still maintains a high performance level.