George Leo Buc, 68, a research physicist and professor of physics at Northern Virginia Community College, died Friday at Commonwealth Doctors Hospital of complications following cancer surgery. He lived in Fairfax City.

Professor Buc began his career as a research physicist and specialist in spectroscopy in 1940 with the American Cyanamid Corp. in New Jersey. He later worked for Tidewater Oil in New Jersey and for the Fisher Scientific Co. in Pittsburgh.

He moved to this area in 1964 to work for the Farrington Manufacturing Co. in Northern Virginia.

In 1967, he was appointed chairman of the physics department and coordinator of the natural sciences and mathematics division of Northern Virginia Community College. He had been an instructor at Rutgers University, where he had earned bachelor's and doctoral degrees.

A native Washingtonian, Professor Buc moved to New Jersey with his family at an early age. He earned a master's degree in physics from Columbia University in 1935.

Professor Buc held 17 patents for spectrophotometers.

Survivors include his wife, Ethel R. Buc of Annandale; two daughters, Nancy L., of Washington, and Vivian E., of Alexandria; a son, Lawrence G., of Washington; a brother, Jerome, of Nashville, and two grandchildren.