Dr. Ulrich K. Henschke, 66, a professor of radiotherapy at Howard University's College of Medicine and an authority on skin cancer, died Sunday in Tanzania, Africa.

Reuters news service report that he died of an apparent heart attack after scrambling from a small plane that had crashed on the rim of Ngorongoro Crater.

The pilot and three other passengers in the plane, including Dr. Alfred Goldson, chairman of the department of radiotherapy at Howard, were injured in the crash and were hospitalized in Nairobi, Kenya. Dr. Goldson suffered fractures of the spinal column.

Dr. Henschke, a resident of Silver Spring, had been at Howard University Medical School since 1970. He and Dr. Goldman were in Africa on university business to provide assistance to the development of health care in a number of African nations.

Dr. Henschke was born in Berlin. He earned a medical degree from the University of Berlin. From 1942 to 1945, he was associate professor of medical physics at the University of Munich.

He came to this country after World War II and was associate professor of radiology at Ohio State University from 1952 to 1955. He was clinical associate professor of radiology at Cornell University Medical School before joining the Howard faculty.

At the time of his death, he also was senior research scientist at the Howard University Cancer Research Center. A pioneer in radiation cancer treatment equipment, he had received a number of national and international awards for his work.

He is survived by four daughters, Dr. Claudia Henschke of Boston, Dr. Monica Henschke of San Francisco, and Rose Henschke and Jacqueline Henschke, both of Washington, and two grandchildren.