Dr. Russell H. Morgan, 75, dean emeritus of The Johns Hopkins University School of Medicine and a pioneer in radiation safety, died Feb. 24 at the Stella Maris Hospice in Towson, Md. He had cancer.

Dr. Morgan was one of the first radiologists to become actively involved with the problems of radiation safety and the control of radiation hazards. He pioneered the epidemiologic evaluation of diagnostic X-ray exposure.

He also helped perfect the image intensification in radiology, improving X-ray images for diagnostic purposes.

In 1958, Dr. Morgan recommended that the federal government combine its radiation standards and health research into a single agency. He later headed a National Academy of Sciences committee that reviewed the health research programs of the Department of Energy.

Dr. Morgan's career at Johns Hopkins began in 1946, when he was named chairman of the department of radiology at the medical school and the first radiologist-in-chief at Johns Hopkins Hospital. In 1960, he became professor and chairman of the department of radiologic science in the School of Hygiene and Public Health.

He was named dean of the medical school in 1971. Two years later he became vice president for the health divisions of The Johns Hopkins University. He held both posts until his retirement in 1976.

During World War II, Dr. Morgan worked in the U.S. Public Health Service. He later conducted clinical investigations of the diagnosis and treatment of black lung disease and asbestosis.

Born in London, Ontario, Dr. Morgan received his bachelor's and medical degrees at the University of Western Ontario. He came to this country and taught at the University of Chicago until he went to Johns Hopkins.

Survivors include his wife, Stella, of Baltimore; two daughters, Monica Davies of Washington, and Mary Morgan of Boston; one sister, Dorothy Morgan of London, Ontario, and one grandson.