The Dialog Cement Evaluation Service is used evaluate the cement bond and the existence of hydraulic zone isolation.  Depending on the applications, the cement evaluation service is performed with a single receiver bond tool, dual receiver bond tool or a radial bond tool.  The single receiver tool utilizes a single transmitter and one receiver spaced at three feet.  The dual receiver tool utilizes a single transmitter and two receivers spaced at three and five feet.   The radial bond tool utilizes a single transmitter with radial receivers at two feet along with standard receivers spaced at three and five feet.