[en] The geometry form related to 241Am/Be spontaneous neutron sources has been investigated to evaluate the most optimizing geometry for disused sealed radioactive source (DSRS) disposal. Nine source geometries were assessed: point, disk, sphere 1, sphere 2, sphere 3, cylinder 1, cylinder 2, rectangle 1, and rectangle 2. The most radiological optimizing geometries were found to be the disk, followed by the point source, sphere 1, and cylinder 1, while the rectangle or parallelepiped 2 source forms were the worst cases. Neutron and photon generated fluxes were computed, and the parallelepiped 2 source geometry generated the lower value of flux inversely to the effective dose rate computed in the decision-making area, where it was found to be the highest value. The obtained results were in agreement with the as low as reasonably achievable principle for the exposure rate optimization. The obtained exposure dose rates were found to be <∼2 μSv/h (maximum value on horizontal calculation) and 1.75 μSv/h (maximum value on vertical computation), which are lower than the 2.5 μSv/h acceptable limit for the public area. Whenever possible, the DSRSs should be pressed into a disk form (or a cylindrical form with a small height) before embedding them into the Am1 P60 capsule for disposal purposes. The dose profile for the 241Am/Be source obtained, the neutron flux, and the gamma generated from neutron absorption showed agreement with the expected experimental physical data. The supported data contribute to postulate that Monte Carlo methods are effective computational tools that can be used to select the most effective radioactive waste form for disposal purposes.
J. Baró, M. Roteta, J. M. Fernández-Varea, and F. Salvat, Radiat. Phys. Chem. 44, 531 (1994). 10.1016/0969-806x(94)90053-1
F. Salvat, J. Fernández-Varea, and J. Sempau, "PENELOPE, A code system for Monte Carlo simulation of electron and photon transport," in Workshop Proceedings, 2011.
G. Zhang, Monte Carlo Simulation of Mixed Neutron-Gamma Radiation Fields and Dosimetry Devices (Elektrotechnik und Informationstechnik des Karlsruher Instituts für Technologie (KIT), 2011).
A. M. Cantaragiu, C. Gheorghies, and C. Borcia, "Study of gamma spectra by Monte Carlo simulation," https://inis.iaea.org/collection/NCLCollectionStore/_Public/44/028/44028935.pdf.
C. J. Guembou Shouop and B. Sang-In, Eur. Phys. J. Plus 135, 784 (2020). 10.1140/epjp/s13360-020-00797-8
G. Shouop, C. Joel, N. M. Maurice, N. Mekongtso, E. Jilbert, M. Ousmanou, and S. David, J. Environ. Radioact. 189, 109 (2018). 10.1016/j.jenvrad.2018.03.015
C. J. Guembou Shouop, S. I. Bak, M. Ndontchueng Moyo, E. J. Nguelem Mekongtso, and D. Strivay, AIP Adv. 10, 075203 (2020). 10.1063/1.5144923
C. J. Guembou Shouop, M. Ndontchueng Moyo, E. J. Nguelem Mekongtso, et al., "Erratum to: Radiological protection requirements with regard to cosmic-ray exposure during air travel," Eur. Phys. J. Plus 136, 391 (2021). 10.1140/epjp/s13360-021-01401-3
C. J. Guembou Shouop, M. Ndontchueng Moyo, E. J. Nguelem Mekongtso, K. Cho, and D. Strivay, Eur. Phys. J. Plus 135, 438 (2020). 10.1140/epjp/s13360-020-00468-8
T. Sato, Y. Iwamoto, S. Hashimoto, T. Ogawa, T. Furuta, S.-i. Abe, T. Kai, P.-E. Tsai, N. Matsuda, H. Iwase, N. Shigyo, L. Sihver, and K. Niita, J. Nucl. Sci. Technol. 55, 684 (2018). 10.1080/00223131.2017.1419890
Y. Iwamoto, T. Sato, S. Hashimoto, T. Ogawa, T. Furuta, S.-i. Abe, T. Kai, N. Matsuda, R. Hosoyamada, and K. Niita, J. Nucl. Sci. Technol. 54, 617 (2017). 10.1080/00223131.2017.1297742
H. N. Ratliff, N. Matsuda, S.-i. Abe, T. Miura, T. Furuta, Y. Iwamoto, and T. Sato, Nucl. Instrum. Methods Phys. Res., Sect. B 484, 29 (2020). 10.1016/j.nimb.2020.10.005
T. Sato, K. Niita, N. Matsuda, S. Hashimoto, Y. Iwamoto, S. Noda, T. Ogawa, H. Iwase, H. Nakashima, T. Fukahori, K. Okumura, T. Kai, S. Chiba, T. Furuta, and L. Sihver, J. Nucl. Sci. Technol. 50, 913 (2013). 10.1080/00223131.2013.814553
T. Sato, K. Niita, N. Matsuda, S. Hashimoto, Y. Iwamoto, T. Furuta, S. Noda, T. Ogawa, H. Iwase, H. Nakashima, T. Fukahori, K. Okumura, T. Kai, S. Chiba, and L. Sihver, Ann. Nucl. Energy 82, 110 (2015). 10.1016/j.anucene.2014.08.023
M. Puchalska, T. Tessonnier, K. Parodi, and L. Sihver, Int. J. Part. Ther. 4, 48 (2017). 10.14338/ijpt-17-00029.1
Y. Peryoga, H. Sagara, and T. Shiba, Energy Procedia 131, 246 (2017). 10.1016/j.egypro.2017.09.445
R. Tesse, F. Stichelbaut, N. Pauly, A. Dubus, and J. Derrien, Nucl. Instrum. Methods Phys. Res., Sect. B 416, 68 (2018). 10.1016/j.nimb.2017.12.006
H. Nose, K. Niita, M. Hara, K. Uematsu, O. Azuma, Y. Miyauchi, M. Komori, and T. Kanai, J. Nucl. Sci. Technol. 42, 250 (2005). 10.1080/18811248.2005.9726386
C. J. Guembou Shouop, in IAEA: International Conference on Radiation Safety: Improving Radiation Protection in Practice, 2020.
K. Niita, N. Matsuda, Y. Iwamoto, H. Iwase, and T. Sato, JAEA-data/code, 2010.
K. Niita, H. Iwase, T. Sato, Y. Iwamoto, N. Matsuda, Y. Sakamoto, H. Nakashima, D. Mancusi, and L. Sihver, Prog. Nucl. Sci. Technol. 1, 1 (2011). 10.15669/pnst.1.1
T. Sato, K. Niita, Y. Iwamoto, S. Hashimoto, T. Ogawa, T. Furuta, S.-i. Abe, T. Kai, N. Matsuda, K. Okumura, T. Kai, H. Iwase, and L. Sihver, EPJ Web Conf. 153, 06008 (2017). 10.1051/epjconf/201715306008
T. Sato, K. Niita, N. Matsuda, S. Hashimoto, Y. Iwamoto, S. Noda, H. Iwase, H. Nakashima, T. Fukahori, S. Chiba, and L. Sihver, Prog. Nucl. Sci. Technol. 4, 879 (2014). 10.15669/pnst.4.879
K. Niita, T. Sato, H. Iwase, H. Nose, H. Nakashima, and L. Sihver, Radiat. Meas. 41, 1080 (2006). 10.1016/j.radmeas.2006.07.013
L. Sihver, T. Sato, K. Gustafsson, D. Mancusi, H. Iwase, K. Niita, H. Nakashima, Y. Sakamoto, Y. Iwamoto, and N. Matsuda, Adv. Space Res. 45, 892 (2010). 10.1016/j.asr.2010.01.002
K. Niita, N. Matsuda, Y. Iwamoto, Y. Sakamoto, H. Nakashima, T. Sato, H. Iwase, L. Sihver, and D. Mancusi, AIP Conf. Proc. 896, 61 (2007). 10.1063/1.2720457
C. J. Guembou Shouop, "Shielding design and safety measures around 60Co, 192Ir, and 252Cf sources," in Industrial Radiography Facilities Based On PHITS Monte Carlo Simulations (KAIST: Korea Advanced Institute of Science and Technology, 2020).
N. Petoussi-Henss, W. E. Bolch, K. F. Eckerman, A. Endo, N. Hertel, J. Hunt, H. G. Menzel, M. Pelliccioni, H. Schlattl, and M. Zankl, Phys. Med. Biol. 59, 5209 (2014). 10.1088/0031-9155/59/18/5209
Y. S. Yeom, C. Choi, H. Han, H. Lee, B. Shin, T. T. Nguyen, M. C. Han, C. Lee, and C. H. Kim, Nucl. Eng. Technol. 52, 1545 (2019). 10.1016/j.net.2019.12.020
N. Petoussi-Henss, W. E. Bolch, K. F. Eckerman, A. Endo, N. Hertel, J. Hunt, M. Pelliccioni, H. Schlattl, and M. Zankl, Ann. ICRP 40, 1 (2010). 10.1016/j.icrp.2011.10.001
J. W. Shin, S. W. Hong, S. I. Bak, D. Y. Kim, and C. Y. Kim, J. Korean Phys. Soc. 65, 591 (2014). 10.3938/jkps.65.591
S. Hashimoto, O. Iwamoto, Y. Iwamoto, T. Sato, and K. Niita, Energy Procedia 71, 191 (2015). 10.1016/j.egypro.2014.11.869
H. R. Vega-Carrillo and S. A. Martinez-Ovalle, Appl. Radiat. Isot. 117, 42 (2016). 10.1016/j.apradiso.2016.03.027
J. E. Strain and G. W. Leddicotte, ORNL-3335. The preparation, properties, and uses of americium-, alpha-, gamma-, and neutron sources, US: N. p., 1962, available at https://doi.org/10.2172/4777909.
M. Tohamy, E. K. Elmaghraby, and M. N. H. Comsan, Nucl. Instrum. Methods Phys. Res., Sect. A 942, 162387 (2019). 10.1016/j.nima.2019.162387
N. Kotb, M. Tohamy, A. Solieman, T. El-Zakla, T. Amer, S. Elmeniawi, and M. Comsan, Al-Azhar Bull. Sci. 30, 48 (2019). 10.21608/absb.2019.67880
M. Tohamy, E. K. Elmaghraby, and M. N. H. Comsan, Appl. Radiat. Isot. 165, 109340 (2020). 10.1016/j.apradiso.2020.109340
M. Tohamy, K. Abbas, S. Nonneman, D. C. Rodriguez, and F. Rossi, Appl. Radiat. Isot. 173, 109694 (2021). 10.1016/j.apradiso.2021.109694
G. S. M. Ahmed, M. Tohamy, P. Bühler, and M. N. H. Comsan, Mod. Phys. Lett. A 36, 2150084 (2021). 10.1142/s021773232150084x
C. J. Guembou Shouop, in International School on Radioactive Waste Cementation, edited by ICTP (ICTP, Trieste, 2020), pp. 16-22.
C. J. Guembou Shouop, M. M. Ndontchueng, E. J. Nguelem Mekongtso, O. Motapon, and D. Strivay, Radiat. Phys. Chem. 188, 109589 (2021). 10.1016/j.radphyschem.2021.109589
