PMID- 31181456
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20190812
IS  - 1872-9800 (Electronic)
IS  - 0969-8043 (Linking)
VI  - 151
DP  - 2019 Sep
TI  - Design by Monte Carlo method of a thermal neutron device using a (241)Am/(9)Be 
      source and high-density polyethylene moderator.
PG  - 150-156
LID - S0969-8043(18)31165-5 [pii]
LID - 10.1016/j.apradiso.2019.05.040 [doi]
AB  - A thermal neutron system intended to be used in neutron activation analysis has 
      been designed by Monte Carlo methods. The device is based on a(241)Am/(9)Be 
      neutron source of 111 GBq, placed inside a cylindrical cavity open inside a 
      parallelepiped of moderator material. Three different moderator materials, water, 
      graphite and high-density polyethylene (HDPE), were simulated to check what is 
      the most suitable for the detection system, concluding that HDPE reach the better 
      performance. The device achieves an increased thermal neutron flux by taking 
      advantage of neutron moderation in the polyethylene and the neutron scattering in 
      the irradiation chamber walls. The thermal fluence rates obtained were 
      904 cm(-2)  s(-1), i.e. 8.144 cm(-2) s(-1) GBq(-1), with a fraction of thermal 
      neutrons at the best point of 83% of pristine fast neutrons emitted by the 
      source. The device has been designed by Monte Carlo techniques using the MCNP6 
      code, and the main tasks developed were to select the moderator material and to 
      maximize the thermal neutrons flux in the irradiation chamber.
CI  - Copyright (c) 2019 Elsevier Ltd. All rights reserved.
FAU - Cevallos-Robalino, Lenin E
AU  - Cevallos-Robalino LE
AD  - Departamento de Ingenieria Energetica, ETSI Industriales, Universidad Politecnica 
      de Madrid, Jose Gutierrez Abascal 2, 28006, Madrid, Spain; Grupo de Investigacion 
      en Sistemas de Control y Robotica, GISCOR, Universidad Politecnica Salesiana, C. 
      Robles 107 Chambers, 090108, Guayas, Guayaquil, Ecuador. Electronic address: 
      lcevallos@ups.edu.ec.
FAU - Garcia-Fernandez, Gonzalo F
AU  - Garcia-Fernandez GF
AD  - Departamento de Ingenieria Energetica, ETSI Industriales, Universidad Politecnica 
      de Madrid, Jose Gutierrez Abascal 2, 28006, Madrid, Spain.
FAU - Lorente, Alfredo
AU  - Lorente A
AD  - Departamento de Ingenieria Energetica, ETSI Industriales, Universidad Politecnica 
      de Madrid, Jose Gutierrez Abascal 2, 28006, Madrid, Spain.
FAU - Gallego, Eduardo
AU  - Gallego E
AD  - Departamento de Ingenieria Energetica, ETSI Industriales, Universidad Politecnica 
      de Madrid, Jose Gutierrez Abascal 2, 28006, Madrid, Spain.
FAU - Vega-Carrillo, Hector Rene
AU  - Vega-Carrillo HR
AD  - Unidad Academica de Estudios Nucleares, Universidad Autonoma de Zacatecas, C. 
      Cipres No. 10, Fracc. La Penuela, 981000, Zacatecas, Zac, Mexico.
FAU - Guzman-Garcia, Karen A
AU  - Guzman-Garcia KA
AD  - Departamento de Ingenieria Energetica, ETSI Industriales, Universidad Politecnica 
      de Madrid, Jose Gutierrez Abascal 2, 28006, Madrid, Spain.
LA  - eng
PT  - Journal Article
DEP - 20190531
PL  - England
TA  - Appl Radiat Isot
JT  - Applied radiation and isotopes : including data, instrumentation and methods for 
      use in agriculture, industry and medicine
JID - 9306253
SB  - IM
OTO - NOTNLM
OT  - (241)Am /(9)Be source
OT  - Dosimetry equipment
OT  - MCNP6 code
EDAT- 2019/06/11 06:00
MHDA- 2019/06/11 06:01
CRDT- 2019/06/11 06:00
PHST- 2018/12/14 00:00 [received]
PHST- 2019/05/10 00:00 [revised]
PHST- 2019/05/30 00:00 [accepted]
PHST- 2019/06/11 06:00 [pubmed]
PHST- 2019/06/11 06:01 [medline]
PHST- 2019/06/11 06:00 [entrez]
AID - S0969-8043(18)31165-5 [pii]
AID - 10.1016/j.apradiso.2019.05.040 [doi]
PST - ppublish
SO  - Appl Radiat Isot. 2019 Sep;151:150-156. doi: 10.1016/j.apradiso.2019.05.040. Epub 
      2019 May 31.