Talbot A. Chubb, 88, a physicist who spent more than 30 years at the Naval Research Laboratory, died Dec. 10 at Virginia Hospital Center in Arlington County.

He had sepsis, his daughter Constance Chubb said.

Dr. Chubb began his career in physics as a researcher who separated uranium isotopes for the U.S. military’s Manhattan Project, which built the first atomic bombs during World War II.

After the war, he joined the Naval Research Laboratory in Washington, where he performed upper-atmosphere experiments using balloons, rockets and satellites. He performed research on solar flares and other phenomena. He was involved in experiments to measure the temperature of certain stars, including the sun, and operated a telescope positioned on the surface of the moon. He retired in 1981.

Talbot Albert Chubb was born in Pittsburgh. He was a 1944 physics graduate of Princeton University. He received a doctorate in physics from the University of North Carolina in the early 1950s.

In retirement, Dr. Chubb did consulting work for government contractors. He also wrote papers promoting nuclear cold fusion as a feasible source of energy.

His wife of 42 years, Martha Capps Chubb, died in 1990.

Survivors include four children, Carroll Chubb of Ottawa, Nancy Chubb of Pittsburgh, Spence Chubb of Falls Church and Constance Chubb of Arlington; eight grandchildren; and a great-granddaughter.

— T. Rees Shapiro