1
|
Comparison of extended-range and conventional Bonner Sphere Spectrometers (BSS) in an AmBe neutron field – Applicability of the ReBUNKI unfolding code for extended-range BSS. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
2
|
A multi-moderator neutron spectrometer for use in BNCT studies of the Tehran research reactor. Appl Radiat Isot 2021; 174:109751. [PMID: 33962118 DOI: 10.1016/j.apradiso.2021.109751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 03/17/2021] [Accepted: 04/23/2021] [Indexed: 11/22/2022]
Abstract
The Tehran Research Reactor is the only appropriate and available neutron source in Iran for clinical boron neutron capture therapy (BNCT). One of the requirements for BNCT is to carefully evaluate and measure the therapeutic neutron beam (epithermal neutrons) as well as the fast and thermal neutron components for successful treatment. In this research, a multi-moderator neutron spectrometer (MMNS) with LiI(Eu) scintillator as neutron counter was proposed for these measurements in the range of 10-11 eV to 15 MeV. The results confirmed promising precision of the designed MMNS for the epithermal spectrum; however, the angular dependency of the therapeutic beam due to any probable change in the beam-shaping assembly should be considered.
Collapse
|
3
|
Asuncion-Astronomo A, Balderas CV, Hila FC, Dela Cruz RMM, Dingle CAM, Solmeron WB, Bedogni R. Validation of an indium-based multi-shell neutron spectrometer. Appl Radiat Isot 2021; 170:109629. [PMID: 33601241 DOI: 10.1016/j.apradiso.2021.109629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 01/17/2021] [Accepted: 01/28/2021] [Indexed: 10/22/2022]
Abstract
A multi-shell neutron spectrometer with indium foil detector (In-MuNS) was developed to evaluate intense neutron fields that are generated in medical accelerators. The response matrix of this new spectrometer was calculated from 1 meV to 100 MeV using MCNP5 v.1.6 with ENDF/B-VIII.0 nuclear data. An experiment with a252Cf source with known emission rate was performed to validate the computational model of the spectrometer. This included detailed modelling of the irradiation room to evaluate the room-scattered field. The contribution of scattered neutrons to the induced activity in the foil reached 30% for the smallest sphere configuration (diameter 5.0 cm). The quotient between the experimental and simulated foil activity remained satisfactorily constant (1.03±0.04) as the sphere diameter varied, demonstrating the validity of the simulation model. In-MuNS proved to be a portable and compact alternative to conventional Bonner spheres.
Collapse
Affiliation(s)
- Alvie Asuncion-Astronomo
- Nuclear Reactor Operations Section, Philippine Nuclear Research Institute - DOST, Diliman, Quezon City, 1101, Philippines.
| | - Charlotte V Balderas
- Applied Physics Research Section, Philippine Nuclear Research Institute - DOST, Diliman, Quezon City, 1101, Philippines
| | - Frederick C Hila
- Applied Physics Research Section, Philippine Nuclear Research Institute - DOST, Diliman, Quezon City, 1101, Philippines
| | - Rafael Miguel M Dela Cruz
- Nuclear Reactor Operations Section, Philippine Nuclear Research Institute - DOST, Diliman, Quezon City, 1101, Philippines
| | - Cheri Anne M Dingle
- Applied Physics Research Section, Philippine Nuclear Research Institute - DOST, Diliman, Quezon City, 1101, Philippines
| | - Williard B Solmeron
- Graduate School, University of Santo Tomas, España, Manila, 1101, Philippines
| | - Roberto Bedogni
- INFN-LNF Frascati National Laboratories, Via E. Fermi n. 40, 00044, Frascati, Italy
| |
Collapse
|
4
|
CubBonner - A novel passive neutron area monitor. Appl Radiat Isot 2020; 161:109129. [PMID: 32250840 DOI: 10.1016/j.apradiso.2020.109129] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 02/25/2020] [Accepted: 03/12/2020] [Indexed: 11/23/2022]
Abstract
Responses of a novel passive neutron area monitor, named CubBonner, were calculated. The responses were estimated for sixty monoenergetic neutrons, from 10-9 to 20 MeV, with the MCNP5 code. The CubBonner is a cubic polyethylene moderator and a gold foil as thermal neutron detector. The ambient dose equivalent response was calculated for three cubes (5″, 8″ and 10" side) with the gold foil at the cube's centers. The moderator cube having the best ambient dose equivalent response was used to estimate the neutron fluence and the 197Au(n,γ) responses per history. The ambient dose response per unit mass of gold was compared with the response of the Berthold LB 6411 active neutron area monitor, and the response for the (n,γ) reaction in the gold foil was compared with the evaporation photo neutrons produced in linear accelerators for radiotherapy.
Collapse
|
5
|
Asuncion-Astronomo A, Hila FC, Dingle CAM, Balderas CV, Dela Cruz RMM, Guillermo NRD. Design of a multi-shell portable neutron spectrometry system based on indium foil detectors. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106248] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
6
|
Kurihara R, Nohtomi A, Wakabayashi G, Sakurai Y, Tanaka H. Preliminary design study of a simple neutron energy spectrometer using a CsI self-activation method for daily QA of accelerator-based BNCT. J NUCL SCI TECHNOL 2018. [DOI: 10.1080/00223131.2018.1523757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Ryosuke Kurihara
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Akihiro Nohtomi
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | | | - Yoshinori Sakurai
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japan
| | - Hiroki Tanaka
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japan
| |
Collapse
|
7
|
CYSP-HS: A new version of the CYSP directional neutron spectrometer with increased sensitivity. Appl Radiat Isot 2018; 142:38-41. [PMID: 30248587 DOI: 10.1016/j.apradiso.2018.09.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 09/13/2018] [Accepted: 09/13/2018] [Indexed: 11/22/2022]
Abstract
CSYP (CYlindrical SPectrometer) is a directional neutron spectrometer based on a single moderator embedding multiple thermal neutron detectors. Similarly to Bonner Spheres, CYSP responds from thermal up to GeV neutrons and the spectrum is obtained via few-channel unfolding methods. CYSP has the shape of a polyethylene cylinder with diameter 50 cm and height 65 cm. Owing on a thick collimator and on a specifically designed shielding structure, the internal detectors only respond to neutrons coming from a known direction. Internal thermal neutron detectors are one-cm2 6LiF-covered silicon diodes. Un upgraded version of CYPS was developed to work in low intensity applications, such as cosmic field measurements. It is called CYSP-HS (High-Sensitivity) and is equipped with large area 6LiF-covered silicon diodes (LATND, Large Area Thermal Neutron Detectors). Compared with the former CYSP, the sensitivity increased approximately by an order of magnitude. This paper presents CYSP-HS focusing on the new internal detectors, the response matrix and its verification in a reference field of Am-Be available at the Politecnico di Milano.
Collapse
|
8
|
Gómez-Ros J, Bedogni R, Bortot D, Domingo C, Lorenzoli M, Moraleda M, Pola A, Sacco D, Plastino W, Parisi M, Signoretti F, Re F. The directional neutron spectrometer CYSP: Further developments for measuring low intensity fields. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.05.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
9
|
Gómez-Ros JM, Bedogni R, Bortot D, Domingo C, Esposito A, Introini MV, Lorenzoli M, Mazzitelli G, Moraleda M, Pola A, Sacco D. TWO NEW SINGLE-EXPOSURE, MULTI-DETECTOR NEUTRON SPECTROMETERS FOR RADIATION PROTECTION APPLICATIONS IN WORKPLACE MONITORING. RADIATION PROTECTION DOSIMETRY 2017; 173:104-110. [PMID: 28100670 DOI: 10.1093/rpd/ncw349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/28/2016] [Indexed: 06/06/2023]
Abstract
This communication describes two new instruments, based on multiple active thermal neutron detectors arranged within a single moderator, that permit to unfold the neutron spectrum (from thermal to hundreds of MeV) and to determine the corresponding integral quantities with only one exposure. This makes them especially advantageous for neutron field characterisation and workplace monitoring in neutron-producing facilities. One of the devices has spherical geometry and nearly isotropic response, the other one has cylindrical symmetry and it is only sensitive to neutrons incident along the cylinder axis. In both cases, active detectors have been specifically developed looking for the criteria of miniaturisation, high sensitivity, linear response and good photon rejection. The calculated response matrix has been validated by experimental irradiations in neutron reference fields with a global uncertainty of 3%. The measurements performed in realistic neutron fields permitted to determine the neutron spectra and the integral quantities, in particular H*(10).
Collapse
Affiliation(s)
- J M Gómez-Ros
- CIEMAT, Av. Complutense 40, 28040 Madrid, Spain
- IFNF-LNF Laboratori Nazionali di Frascati, via E. Fermi n. 40, 00044 Frascati, Italy
| | - R Bedogni
- IFNF-LNF Laboratori Nazionali di Frascati, via E. Fermi n. 40, 00044 Frascati, Italy
| | - D Bortot
- Politecnico di Milano-Dipartimento di Energia, Via Ponzio 34/3, 20133 Milano, Italy
| | - C Domingo
- UAB, Physics Department, 08193 Bellaterra, Spain
| | - A Esposito
- IFNF-LNF Laboratori Nazionali di Frascati, via E. Fermi n. 40, 00044 Frascati, Italy
| | - M V Introini
- Politecnico di Milano-Dipartimento di Energia, Via Ponzio 34/3, 20133 Milano, Italy
| | - M Lorenzoli
- Politecnico di Milano-Dipartimento di Energia, Via Ponzio 34/3, 20133 Milano, Italy
| | - G Mazzitelli
- IFNF-LNF Laboratori Nazionali di Frascati, via E. Fermi n. 40, 00044 Frascati, Italy
| | - M Moraleda
- CIEMAT, Av. Complutense 40, 28040 Madrid, Spain
| | - A Pola
- Politecnico di Milano-Dipartimento di Energia, Via Ponzio 34/3, 20133 Milano, Italy
| | - D Sacco
- IFNF-LNF Laboratori Nazionali di Frascati, via E. Fermi n. 40, 00044 Frascati, Italy
- INAIL-DIT, Via di Fontana Candida 1, 00040 Monteporzio Catone, Italy
| |
Collapse
|