Jerry V. Marion, 51, an author, professor of physics at the University of Maryland and former consultant to government and private industry, died Sunday at a hospital in Kingsport, Tenn. He had a cardiovascular ailment.

Dr. Marion, who lived in Adelphi, was visiting relatives in Blountville, Tenn., when he was stricken. He was born in Mobile, Ala., and graduated fr4om Reed College.

In 1957, he joined the faculty at the University of Maryland as a research physicist and codirector of experimental nuclear physics at the university's Van de Graaff Laboratory. He became a professor of physics in 1972. He also was a prinicipal investigator at the university's cyclotron laboratory.

Before moving to this area, he was on the faculty of the University of Rochester, a physicist at the Los Alamos Scientific Laboratory nuclear energy facility in Tennessee. He was a consultant to the National Aeromautics and Space Administration and the Armed Forces Radiobiology Research Institute.

Dr. Marion also was a staff scientist for Convair in San Diego and a consultant for General Dynamics, Shell, Grumman Aircraft and Radiation Dynamics.

He was a committee member of the National Academy of Sciences-Nuclear Regulatory Commission and a member of the eidtorial board of Nuclear Data. He was a Fellow of the National Science and Guggenheim foundations, the American Physical Society and the American Association for the Advancement of Science.

Dr. Marion was the author or coauthor of 44 books and monographs. His college-level textbooks have been translated into Russian, Italian, Spanish, Japanese and Malay.

His awards include the science teaching award of the Washington Academy of Sciences.

Survivors include his wife, the former Adelia I. MacNab, a son, Forrest Lee, and a daughter, Kathryn Ann, all of Adelphi.