An integrated circuit includes a radiation-triggered shutdown circuit that disables a critical aspect of the integrated circuit rendering the integrated circuit non-functional when the integrated circuit receives a predetermined radiation dose. Such access openings are referred to as \u201copen bottom pockets\u201d. In addition, a return fee note field can be used to transmit explanatory notes that are used to explain non-flat fee charges that will apply. The first lubricant scattering prevention member is provided downstream from a first contact position at which the brush contacts the solid lubricant and upstream from a second contact position at which the brush contacts the rotating member in a direction of rotation of the brush. The vanes revolve around the drill pipe so as to displace chippings which are blown from the hole during a drilling operation, outwardly away from the drill pipe to form an annular mound around and spaced from the hole.