The Neutron Fluence and H*(10) Response of the New LB 6411 REM Counter

Burgkhardt, B.; Fieg, G.; Klett, A.; Plewnia, A.; Siebert, B.R.L.

doi:10.1093/oxfordjournals.rpd.a031977

Cited by 84 publications

(48 citation statements)

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“…7 is the H* (10) values measured with the neutron area monitor LB 6411, in this figure the H*(10) values calculated through Eq. (2), using the spectra measured with the BSS/ 6 LiI(Eu) and the fluence-to-dose coefficients from ICRP 74 (ICRP, 1996) (BSS (ICRP 74)), and the LB 6411 response function (Burgkhardt et al, 1997) (BSS (LB 6411)) are also included.…”

Section: Resultsmentioning

confidence: 99%

“…(2), h%(E) are the fluence-to-ambient dose equivalent coefficients, in pSvcm 2 , from the ICRP 74 (ICRP, 1996) or the response of the neutron area monitor LB 6411 (Burgkhardt et al, 1997).…”

Section: H*(\0) = Jhl(e)$ E (E)dementioning

confidence: 99%

“…With the neutron area monitor Berthold LB 6411 (Burgkhardt et al, 1997) the H*(10) values were measured at the same locations on the bench where the neutron spectra were measured. These values were compared with those obtained through Eq.…”

Section: H*(\0) = Jhl(e)$ E (E)dementioning

confidence: 99%

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Neutron features at the UPM neutronics hall

Vega-Carrillo

Gallego

Lorente

et al. 2012

Applied Radiation and Isotopes

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HIGHLIGHTS• Neutron spectra and ambient dose equivalent, of a neutronics hall has been estimated.• Using Monte Carlo methods a detailed model of the hall and the new Al-made measuring bench were used to estimate neutron spectra and H*(10).• Neutron spectra were measured using a Bonner sphere spectrometer along the measuring bench, neutron spectra were used to estimate the H* (10) and to calculate the total fluence rate.• H*(10) was also measured using the neutron area monitor LB 6411 and compared with values obtained in the Monte Carlo calculations.• Total fluence rate was fitted to the semiempirical model. ABSTRACTThe neutronics hall of the Nuclear Engineering Department at the Polytechnical University of Madrid has been characterized. The neutron spectra and the ambient dose equivalent produced by an 241 AmBe source were measured at various source-to-detector distances on the new bench. Using Monte Carlo methods a detailed model of the neutronics hall was designed, and neutron spectra and the ambient dose equivalent were calculated at the same locations where measurements were carried out. A good agreement between measured and calculated values was found.

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Section: Resultsmentioning

confidence: 99%

Section: H*(\0) = Jhl(e)$ E (E)dementioning

confidence: 99%

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Neutron features at the UPM neutronics hall

Vega-Carrillo

Gallego

Lorente

et al. 2012

Applied Radiation and Isotopes

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“…Both types of TLD ( 6 Li and 7 Li) have a similar sensitivity to photons, but only 6 Li is sensitive to slow neutrons. Thus, the neutron dose equivalent is evaluated from the difference between the mean values of the readings for the three 6 Li and 7 Li chips. The dosemeter calibration is performed in two steps.…”

Section: Tld Dosemeter Calibrationmentioning

confidence: 99%

“…The reference dose equivalent is obtained from the laboratory's transfer standardÐ a Berthold LB 6411 calibrated at the PhysikalischTechnische Bundesanstalt (PTB). Then the net signal from the TLDs (the difference between the absorbed dose measured with 6 Li and 7 Li chips) is compared with the reference dose equivalent to obtain a calibration factor expressed in Sv Gy…”

Section: Tld Dosemeter Calibrationmentioning

confidence: 99%

Calibration and testing of a TLD dosemeter for area monitoring

Buchillier¹,

Aroua²,

Bochud³

et al. 2004

Radiation Protection Dosimetry

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Range shifter contribution to neutron exposure of patients undergoing proton pencil beam scanning

Romero‐Expósito,

Liszka,

Christou

et al. 2023

Medical Physics

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BackgroundSuperficial targets require the use of the lowest energies within the available energy range in proton pencil‐beam scanning (PBS) technique. However, the lower efficiency of the energy selection system at these energies and the requirement of a greater number of layers may represent disadvantages for this approach. The alternative is to use a range shifter (RS) at nozzle exit. However, one of the concerns of using this beamline element is that it becomes an additional source of neutrons that could irradiate organs situated far from the target.PurposeThe purpose of this study is to assess the increase in neutron dose due to the RS in proton PBS technique. Additionally, an analytical model for the neutron production is tested.MethodsTwo clinical plans, designed to achieve identical target coverage, were created for an anthropomorphic phantom. These plans consisted of a lateral field delivering an absorbed dose of 60 Gy (RBE) to the target. One of the plans employed the RS. The MCNP code was used to simulate the plans, evaluating the distribution of neutron dose equivalent (Hn) and the equivalent dose in organ. In the plan with the RS plan, neutron production from both the patient and the RS were assessed separately. Hn values were also fitted versus the distance to field edge using a Gaussian function.ResultsHn per prescription dose, in the plan using the RS, ranged between 1.4 and 3.7 mSv/Gy at the field edge, whereas doses at 40 cm from the edge ranged from 9.9 to 32 μSv/Gy. These values are 1.2 to 10 times higher compared to those obtained without the RS. Both this factor and the contribution of neutrons originating from the RS increases with the distance from field edge. A triple‐Gaussian function was able to reproduce the equivalent dose in organs within a factor of 2, although underestimating the values.ConclusionsThe dose deposited in the patient by the neutrons originating from the RS predominantly affects areas away from the target (beyond approximately 25 cm from field edge), resulting in a neutron dose equivalent of the order of mSv. This indicates an overall low neutron contribution from the use of RS in PBS.

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The Neutron Fluence and H*(10) Response of the New LB 6411 REM Counter

Cited by 84 publications

References 0 publications

Neutron features at the UPM neutronics hall

Neutron features at the UPM neutronics hall

Calibration and testing of a TLD dosemeter for area monitoring

Range shifter contribution to neutron exposure of patients undergoing proton pencil beam scanning

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