Cooperation of Mr. Michael K. Carroll and his colleagues at Inventure Laboratory, Knoxville related to biaxial stretching experiments for the study is acknowledged. Contributions of Dr. Chuck Melcher from the Scintillation Materials Research Group related to use of some of the optical characterization equipment and assistance of Dr. George Schweitzer, Dr. Andrew Mabe, and Dr. John Auxier from the Department of Chemistry at the University of Tennessee related to the synthesis of neutron absorbing particles is gratefully acknowledged. The research effort was supported by the Domestic Nuclear Detection Office (DNDO) through award 003387891.
6Li Embedded Biaxially Stretched Scintillation Films for Thermal Neutron Detection and Neutron/Gamma Discrimination†
Article first published online: 31 OCT 2013
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 16, Issue 2, pages 196–201, February 2014
How to Cite
Uppal, R., Sen, I., Penumadu, D., Young, S. A., Urffer, M. J. and Miller, L. F. (2014), 6Li Embedded Biaxially Stretched Scintillation Films for Thermal Neutron Detection and Neutron/Gamma Discrimination. Adv. Eng. Mater., 16: 196–201. doi: 10.1002/adem.201300237
- Issue published online: 17 FEB 2014
- Article first published online: 31 OCT 2013
- Manuscript Accepted: 11 AUG 2013
- Manuscript Received: 25 JUN 2013
Biaxially stretched composite polyethylene naphthalate (PEN) films (BSCPF) embedded with submicron lithium fluoride (6LiF) particles and luminescent molecules were fabricated to make large area scintillation films (≈1 m × 1 m) for thermal neutron detection. BSCPF had 20.2% higher neutron light yield as compared to unstretched composite film (UCPF), and were 2.46 ± 1.47 times more efficient for detecting thermal neutrons than lithiated glass GS20 above lower level discriminator corresponding to an intrinsic efficiency for gamma <10−6. MCNPX simulations for a layered BSCPF detector resulted 6.1 cps for 1 ng 252Cf, thus meeting the Pacific Northwest National Laboratory criteria for absolute neutron detection efficiency and intrinsic gamma-neutron discrimination. BSCPF have alpha to beta ratio of 0.25, which is higher than that for UCPF (0.11), and also for GS20 (0.22), which offers the possibility of excellent neutron/gamma discrimination.