SINBAD ABSTRACT NEA-1552/08
Transmission of Neutrons and Photons Generated by 65 MeV Protons
1. Name of Experiment: ------------------ Transmission Through Shielding Materials of Neutrons and Photons Generated by 65 MeV Protons (1991) 2. Purpose and Phenomena Tested: ---------------------------- Transmission of secondary neutrons and photons generated by 65 MeV protons through shielding materials. Graphite, iron, lead and concrete assemblies were studied to obtain information on the secondary neutron effects, needed for the design of high energy accelerator shielding. 3. Description of the Source and Experimental Configuration: -------------------------------------------------------- The experiments were performed at the AVF cyclotron of Research Center of Nuclear Physics, Osaka University. A copper target of 65 MeV proton stopping range was used. The secondary neutrons and photons were collimated by a 7.5-cm diam., 50-cm long iron-lined concrete hole. The test shields of concrete, iron, lead and graphite were placed very close to the collimator exit. The shields were slabs about 40 x 40 cm in cross section and 10 to 100 cm thick. 4. Measurement System and Uncertainties: ------------------------------------ A 76-mm-diam. x 76-mm-long NE-213 scintillation detector was placed just behind the shield system. The pulse height distributions were converted to neutron and photon energy spectra by using the revised FERDO-U unfolding code [2]. The background data were obtained in the same geometrical condition except that the collimator was closed by an iron plug. The collimated 0 deg. neutron source spectrum measurement was made without the shield at a location 538 cm down from the copper target using the same detection system. Neutron source below 4.5 MeV was not measured. Use of the evaporation spectrum was suggested in this energy range. Gamma ray source spectrum is also given for energies above 1.8 MeV. Information on the uncertainties is available only in graphical form. 5. Description of Results and Analysis: ----------------------------------- Absolute neutron penetration spectral measurements were reported at 20, 40, and 60-cm-thick-iron; 10, 20, and 30-cm-thick lead; 30, 60, and 90-cm-thick graphite; and 20, 50, and 100-cm-thick concrete. The photon spectral measurements are reported for the 20-cm-thick iron, 10-cm-thick lead, 30-cm-thick graphite, and the 20 and 50-cm-thick concrete. Neutron spectral measurements were reported for 5 MeV to 61 MeV and Photon spectral measurements for 1.9 MeV to 9.4 MeV. Data are plotted with 1-sigma error bars and with computational results using MORSE/DLC-87. Calculations were performed by MORSE, ANISN and MCNP-4A codes using DLC58/HELLO, DLC119/HILO86, DLC87/HILO and ENDF/B-VI high energy cross-sections [3], [4]. 6. Special Features: ---------------- None 7. Author/Organizer ---------------- Experiment and analysis: Shin K.(*), Ishii Y.(*), Miyahara K.(*), Uwamino Y.(**), Sakai H.(***), Numata S.(****): (*) Dep. of Nuclear Engineering, Kyoto University Sankyo, Kyoto 606, Japan (**) Institute for Physical and Chemical Research, Hirosawa 2-1, Wako 351-01, 188, Japan (***) University of Tokyo, Dep. of Physics, Hongo, Bunkyo-ku, Tokyo 113, Japan (****) Shimizu Corporation, Institute for Technology, Echujima, Koto-ku, Tokyo 135, Japan Compiler of data for Sinbad: I. Kodeli OECD/NEA, 12 bd des Iles, 92130 Issy les Moulineaux, France Reviewer of compiled data: Hamilton Hunter, Radiation Shielding Information Center, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6362, fax 423-574-6182, e-mail: h3o@ornl.gov. 8. Availability: ------------ Unrestricted 9. References: ---------- [1] Shin K., Ishii Y., Miyahara K., Uwamino Y., Sakai H. and Numata S.: "Transmission of Intermediate-Energy Neutrons and Associated Gamma Rays Through Iron, Lead, Graphite, and Concrete Shields," Nucl. Sci. Eng., 109, 380-390 (1991). [2] K. Shin et al., Nucl. Technol., 53, 78 (1981). [3] K. Hayashi, et al.: "Accelerator Shielding Benchmark Analysis and Future Items to be Solved", SATIF Proceedings of the Specialists Meeting, Arlington, USA, 28-29 April 1994, OECD 1995 [4] H. Nakashima, et al.: "Accelerator Shielding Benchmark Experiment Analyses", SATIF-2 Proceedings of the Specialists' Meeting, CERN, Geneva, Switzerland, 12-13 Oct. 1995, OECD 1996 [5] H. Nakashima et al., "Benchmark Problems for Intermediate and High Energy Accelerator Shielding", JAERI 94-012 (Sept.1994). 10. Data and Format: --------------- Filename Size[bytes] Content ---------------- ----------- ------------- 1 P65-abs.htm 8.471 This information file. 2 P65-exp.htm 21.597 Description of Experiment. 3 P65MEV-1.TIF 36.972 Figure 1: Experimental arrangement. (high quality) 4 P65MEV-2.TIF 54.241 Figure 2: Neutron and photon spectra. (high quality) 5 P65MEV-3.TIF 42.473 Figure 3: Neutron and photon spectra. (high quality) 6 P65MEV-4.TIF 54.070 Figure 4: Neutron and photon spectra. (high quality) 7 P65MEV-5.TIF 48.066 Figure 5: Neutron and photon spectra. (high quality) 8 P65MEV-6.TIF 35.461 Figure 6: Neutron and photon spectra. (high quality) 9 P65MEV-7.TIF 38.664 Figure 7: Neutron and photon spectra. (high quality) 10 P65MEV-8.TIF 34.885 Figure 8: Neutron and photon spectra. (high quality) 11 P65MEV-9.TIF 41.125 Figure 9: Neutron and photon spectra. (high quality) 12 P65MEV-1.gif 7.987 Figure 1: Experimental arrangement. (preview) 13 P65MEV-2.gif 8.189 Figure 2: Neutron and photon spectra. (preview) 14 P65MEV-3.gif 10.461 Figure 3: Neutron and photon spectra. (preview) 15 P65MEV-4.gif 10.331 Figure 4: Neutron and photon spectra. (preview) 16 P65MEV-5.gif 9.487 Figure 5: Neutron and photon spectra. (preview) 17 P65MEV-6.gif 6.060 Figure 6: Neutron and photon spectra. (preview) 18 P65MEV-7.gif 6.401 Figure 7: Neutron and photon spectra. (preview) 19 P65MEV-8.gif 6.115 Figure 8: Neutron and photon spectra. (preview) 20 P65MEV-9.gif 7.258 Figure 9: Neutron and photon spectra. (preview) 21 J94_012.pdf 3.233.504 Reference Tables: (1,2) Dimensions and compositions of materials (3,4) Neutron and photon source spectra (5-9) Neutron and photon transmission spectra Figures are included in TIFF 5.0 Compressed image format and GIF (preview) format.
