Relative Bechmann Angle. Relative Bechmann Angle is the apparent angle of orientation of an AT crystal blank, which is derived from a plot of the temperature vs. frequency characteristic of a crystal resonator.
relative byte address. The displacement in bytes of a stored record or control interval from the beginning of the storage space allocated to the data set to which it belongs.
Rapid Bioassessment - evaluation of the biological conditions of a waterbody that uses biological surveys of the resident plants, animals, and other living organisms that depend upon the aquatic resource.
Radiological buffer area. An intermediate area established to prevent the spread of radioactive contamination and to protect personnel from radiation exposure.