ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
2026 ANS Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
Latest Magazine Issues
Feb 2026
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
February 2026
Nuclear Technology
January 2026
Fusion Science and Technology
Latest News
ANS Congressional Fellowship program seeks 2027 applicants
Earlier this week, ANS opened the application process for the 2027 Glenn T. Seaborg Congressional Science and Engineering Fellowship, offering ANS members an opportunity to contribute directly to federal policymaking in Washington, D.C. Applications are due June 6.
K. Ganguly, A. Sengupta
Nuclear Science and Engineering | Volume 77 | Number 1 | January 1981 | Pages 13-19
Technical Paper | doi.org/10.13182/NSE81-A21335
Articles are hosted by Taylor and Francis Online.
In this paper, interface and source problems are solved by the transport theoretic PN approximation. The usual interface conditions are modified and the TPN method is applied to solve interface problems. A separate TPN approximation based on the constant source Milne problem is formulated for source problems.