Response functions of a Bonner sphere spectrometer calculated with GEANT4

Garny, Sylvia; Mares, V.; Rühm, W.

doi:10.1016/j.nima.2009.02.044

Cited by 27 publications

(11 citation statements)

References 22 publications

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“…From the figure, we can obviously find that as the PS size increases, the peak of the response function gradually moves to the high-energy range, the larger PSs tend to be more sensitive to higher energy neutrons, and starting from the 7 inch sphere, the value of the peak for each response function is on the decline. We compared this with the other response function of the same type taken from the published literature [1,11,12] , and found they fit very well.…”

Section: Response Function Calculationmentioning

confidence: 97%

Calculation of Response Function for Bonner Sphere Spectrometer Based on Geant4

Cao¹,

Jiang²,

Jiang³

et al. 2015

Plasma Sci. Technol.

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In order to make further studies on fusion neutron diagnosis on HL-2A /HL-2M, we have developed and succeeded in the calculation of the Response Function for a Bonner sphere spectrometer, which consists of eight polyethylene spheres with 3 He proportional counters inside. The response function of the Bonner spectrometer to neutrons is of fundamental importance for its neutron spectrum unfolding procedure and is directly related to the quality of the unfolded spectrum. In this paper, we calculated the response function to neutrons from 10 −9 MeV to 100 MeV by Geant4. In order to test the accuracy of the Geant4 simulation, we apply it to measure an 241 Am-Be neutron source, and the measured neutron counts of the spectrometer and simulated counts are found to be highly consistent, with a relative error up to 9.3%. This has proven the calculation of the neutron response of the Bonner sphere spectrometer by Geant4 to be quite accurate.

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Section: Response Function Calculationmentioning

confidence: 97%

Calculation of Response Function for Bonner Sphere Spectrometer Based on Geant4

Cao¹,

Jiang²,

Jiang³

et al. 2015

Plasma Sci. Technol.

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“…A recent computational exercise (38) organised in the framework of the CONRAD project demonstrated that the MCNP family is used in the majority of the cases. FLUKA (39,40) and GEANT 4 (41) have also been used, obtaining comparable results. Accurate (within few per cent) response function calculations can be done from thermal to 20-MeV neutrons, because the cross-sectional libraries are well established in this energy range.…”

Section: The Response Of the Bssmentioning

confidence: 99%

Neutron spectrometry with Bonner Spheres for area monitoring in particle accelerators

Bedogni

2011

Radiation Protection Dosimetry

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Selecting the instruments to determine the operational quantities in the neutron fields produced by particle accelerators involves a combination of aspects, which is peculiar to these environments: the energy distribution of the neutron field, the continuous or pulsed time structure of the beam, the presence of other radiations to which the neutron instruments could have significant response and the large variability in the dose rate, which can be observed when moving from areas near the beam line to free-access areas. The use of spectrometric techniques in support of traditional instruments is highly recommended to improve the accuracy of dosimetric evaluations. The multi-sphere or Bonner Sphere Spectrometer (BSS) is certainly the most used device, due to characteristics such as the wide energy range, large variety of active and passive detectors suited for different workplaces, good photon discrimination and the simple signal management. Disadvantages are the poor energy resolution, weight and need to sequentially irradiate the spheres, leading to usually long measurement sessions. Moreover, complex unfolding analyses are needed to obtain the neutron spectra. This work is an overview of the BSS for area monitoring in particle accelerators.

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“…The first step towards neutron spectral reconstruction is to calculate response functions of Bonner spheres. There are many calculations of Bonner sphere responses in literature [83] [94] [95]. But, it is always a good idea to repeat the calculations as a consistency check.…”

Section: Analyzing Scattered Neutron Spectramentioning

confidence: 99%

“…This nested neutron spectrometer is available commercially.Another important improvement is the reduction of the effort which goes into the calculation of the response functions. With modern fast computers and monte-carlo simulation techniques, the response functions can be calculated more accurately and efficiently.Figure 5.4 shows response functions calculated using GEANT4 montecarlo package[83].…”

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confidence: 99%

“…Gold foil is used inside of spheres as the thermal neutron detector. Sphere size in inches is indicated on each line[83].Chapter 5. Evaluation of neutron scattering effects in a JLab radiation-detector calibration facility using Bonner spheres 162 Bonner sphere Spectrometer at JLab The JLab Radiation Control Department (RadCon) has constructed a BSS which consists of 5 BS's.…”

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confidence: 99%

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Neutron Radiation, Radiation Measurement and the JLab APEX Experiment

Kaluarachchi

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The A Experiment (APEX), which is approved to run at the Thomas Jefferson Accelerator Facility (JLab) Hall A, will search for a new vector boson that is hypothesized to be a possible force carrier that couples to dark matter. APEX results should be sensitive to the mass range of 65 MeV to 550 MeV, and high sensitivity will be achieved by means of a high intensity ∼ 100 µA beam on a ∼ 0.3 g/cm 2 Tungsten target resulting in very high luminosity. The experiment should be able to observe an A with a coupling constant α ∼ 1×10 7 times smaller than the electromagnetic First and foremost I want to thank my advisor Prof. Gordon Cates. It has been an honor to work with him all these years and learn from one of the best in the field. I am very fascinated by his excitement and enthusiasm when he talks about physics and it always kept me motivated, even during tough times in the Ph.D. pursuit. Apart from physics, I really enjoyed our discussions on politics, religion, culture, music and his life experiences. Prof. Cates supported me not only by providing a research assistantship for over five years, but also academically and emotionally through the rough road to finish this thesis. Above all, I am thankful for being such a nice person, which made my life as a graduate student joyful. The members of my research and thesis committee, Prof. Dinko Počanić, Prof. Don Crabb and Prof. Wilson Miller provided feedback through out these years to steer my project and thesis to a success .

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Response functions of a Bonner sphere spectrometer calculated with GEANT4

Cited by 27 publications

References 22 publications

Calculation of Response Function for Bonner Sphere Spectrometer Based on Geant4

Calculation of Response Function for Bonner Sphere Spectrometer Based on Geant4

Neutron spectrometry with Bonner Spheres for area monitoring in particle accelerators

Neutron Radiation, Radiation Measurement and the JLab APEX Experiment

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