When the partition of India became imminent (1947), he returned to Calcutta (now known as Kolkata) and taught there until 1956. He insisted every student design their own equipment using local materials and local technicians. He was made professor emeritus on his retirement. He then became Vice-Chancellor of Visva-Bharati University in Santiniketan. He returned to the University of Calcutta to continue research in nuclear physics and complete earlier works in organic chemistry. In subsequent years, he worked in applied research such as extraction of helium in hot springs of Bakreshwar.