b'Figure 3. Preliminary analysis of the neutron transmission. The dips in the transmission spectrum are due to neutron absorption resonances, indicating the presence of specific isotopes. The fit (red curve) allows to quantify the isotope density. As is evident in the difference curve between measured data and fit in the lower part of the figure, several resonances are not yet identified in the preliminary results shown here.INL, Jason Harp/ORNL) is on-going.(1983). Neutron resonance trans-Improvements of the sample holder formission analysis of reactor spent future characterization of such disk-shipfuel assemblies. In Neutron Radi-samples are also discussed. Data analysisography (pp. 503-511). Springer, for diffraction and resonances as wellDordrecht.as data interpretation and writing of[4.] STERBENTZ, J. W., & CHICHESTER, a manuscript describing this effortD. L. (2010). Neutron resonance are funded by AFC. Development oftransmission analysis (NRTA): a advanced energy-resolved imaging datanondestructive assay technique for analysis methods demonstrated herethe next generation safeguards ini-are funded by a LANL LDRD and NSUFtiatives plutonium assay challenge funding for receiving, handling and(No. INL/EXT-10-20620). Idaho data collection on the HIPPO and FP5/ National Laboratory (INL).ERNI beamlines at LANSCE is gratefully acknowledged. [5.] CHICHESTER, D. L., & STERBENTZ, References:J. W. (2011, July). A second look [1.] PRIESMEYER, H. G., & HARZ, U.at neutron resonance transmis-(1975). Isotopic content determi- sion analysis as a spent fuel NDA nation in irradiated fuel by neutrontechnique. In Conference: INMM transmission analysis. Atomkernen- 52nd Annual Meeting, Palm Desert, ergie, 25(2), 109-113. CA USA.[2.] BEHRENS, J. W., JOHNSON, R. G.,[6.] HARP, JASON M., HEATHER JM & SCHRACK, R. A. (1984). NeutronCHICHESTER, AND LUCA CAPRI-resonance transmission analysis ofOTTI. "Postirradiation examination reactor fuel samples. Nuclear tech- results of several metallic fuel alloys nology, 67(1), 162-168. and forms from low burnup AFC irradiations." Journal of Nuclear [3.] BOWMAN, C. D., SCHRACK, R. A.,Materials 509 (2018): 377-391.BEHRENS, J. W., & JOHNSON, R. G. 2021|AFC ACCOMPLISHMENTS 45'