Uncertainties in linear energy transfer spectra measured with track-etched detectors in space

Brabcová, Kateřina Pachnerová; Ambrožová, Iva; Koliskova, Zlata

doi:10.1016/j.nima.2013.03.012

Cited by 24 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the these studies, neutron dose equivalent measured using track detectors in an adult RANDO phantom, 52 water tank, 49 and 5‐year‐old phantom 53 were ∼2 mSv/Gy, ∼0.7 mSv/Gy, and ∼0.5 mSv/Gy at 10 cm laterally from the isocenter, respectively. Taking into account that in these studies, the simulated target was extended 5 cm 48 and 3 cm 51 from the isocentre, these results are in the range of H n / D T reported in this study. Photon doses measured with RPLs ∼0.5 mGy/Gy at 10 cm and ∼0.6 mGy/Gy at 12 cm from the isocenter were reported by Stolarczyk et al 49 .…”

Section: Discussionsupporting

confidence: 69%

See 1 more Smart Citation

Out‐of‐field doses in pediatric craniospinal irradiations with 3D‐CRT, VMAT, and scanning proton radiotherapy: A phantom study

et al. 2022

Self Cite

View full text Add to dashboard Cite

Craniospinal irradiation (CSI) has greatly increased survival rates for patients with a diagnosis of medulloblastoma and other primitive neuroectodermal tumors. However, as it includes exposure of a large volume of healthy tissue to unwanted doses, there is a strong concern about the complications of the treatment, especially for the children. To estimate the risk of second cancers and other unwanted effects,out-of -field dose assessment is necessary.The purpose of this study is to evaluate and compare out-of -field doses in pediatric CSI treatment using conventional and advanced photon radiotherapy (RT) and advanced proton therapy. To our knowledge, it is the first such comparison based on in-phantom measurements. Additionally, for out-of -field doses during photon RT in this and other studies, comparisons were made using analytical modeling. Methods: In order to describe the out-of -field doses absorbed in a pediatric patient during actual clinical treatment, an anthropomorphic phantom, which mimics the 10-year-old child, was used. Photon 3D-conformal RT (3D-CRT) and two advanced, highly conformal techniques: photon volumetric-modulated arc therapy (VMAT) and active pencil beam scanning (PBS) proton RT were used for CSI treatment. Radiophotoluminescent and poly-allyl-diglycol-carbonate nuclear track detectors were used for photon and neutron dosimetry in the phantom, respectively. Out-of -field doses from neutrons were expressed in terms of dose equivalent. A two-Gaussian model was implemented for out-of -field doses during photon RT. Results: The mean VMAT photon doses per target dose to all organs in this study were under 50% of the target dose (i.e., <500 mGy/Gy), while the mean 3D-CRT photon dose to oesophagus, gall bladder, and thyroid, exceeded that value. However, for 3D-CRT, better sparing was achieved for eyes and lungs. The mean PBS photon doses for all organs were up to three orders of magnitude lower compared to VMAT and 3D-CRT and exceeded 10 mGy/Gy only for the oesophagus, intestine, and lungs. The mean neutron dose equivalent during PBS for eight organs of interest (thyroid, breasts, lungs, liver, stomach, gall bladder, bladder, prostate) ranged from 1.2 mSv/Gy for bladder to 23.1 mSv/Gy for breasts. Comparison of out-of -field doses in this and other phantom studies found in the literature showed that a simple and fast two-Gaussian model for out-of -field doses as a function of distance from the field edge can be applied in a CSI using photon RT techniques.

show abstract

Section: Discussionsupporting

confidence: 69%

“…The overall uncertainties are ∼20%. More information about the detectors and their analysis can be found in the previously published papers 47–49 …”

Section: Methodsmentioning

confidence: 99%

Out‐of‐field doses in pediatric craniospinal irradiations with 3D‐CRT, VMAT, and scanning proton radiotherapy: A phantom study

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Nuclear Physics Institute (NPI), Prague, Czech Republic, used HARZLAS TD-1 (Nagase Landauer Ltd.) detectors with a thickness of 0.9 mm. After etching in 5 N NaOH at 70°C for 18 h, the tracks are imaged and analyzed using the system HSP-1000 and software HspFit (Pachnerová Brabcová et al 2013).…”

Section: Passive Detectors: Nuclear Track Etch Detectorsmentioning

confidence: 99%

DOSIS & DOSIS 3D: long-term dose monitoring onboard the Columbus Laboratory of the International Space Station (ISS)

Berger

Przybyla

Matthiä

et al. 2016

J. Space Weather Space Clim.

View full text Add to dashboard Cite

The radiation environment encountered in space differs in nature from that on Earth, consisting mostly of highly energetic ions from protons up to iron, resulting in radiation levels far exceeding the ones present on Earth for occupational radiation workers. Since the beginning of the space era, the radiation exposure during space missions has been monitored with various active and passive radiation instruments. Also onboard the International Space Station (ISS), a number of area monitoring devices provide data related to the spatial and temporal variation of the radiation field in and outside the ISS. The aim of the DOSIS (2009DOSIS ( -2011 and the DOSIS 3D (2012-ongoing) experiments was and is to measure the radiation environment within the European Columbus Laboratory of the ISS. These measurements are, on the one hand, performed with passive radiation detectors mounted at 11 locations within Columbus for the determination of the spatial distribution of the radiation field parameters and, on the other, with two active radiation detectors mounted at a fixed position inside Columbus for the determination of the temporal variation of the radiation field parameters. Data measured with passive radiation detectors showed that the absorbed dose values inside the Columbus Laboratory follow a pattern, based on the local shielding configuration of the radiation detectors, with minimum dose values observed in the year 2010 of 195-270 lGy/day and maximum values observed in the year 2012 with values ranging from 260 to 360 lGy/day. The absorbed dose is modulated by (a) the variation in solar activity and (b) the changes in ISS altitude.

show abstract

“…The another sources of uncertainty comes from the calibration function 13 . According to the uncertainty study in LET specrum 24 , the uncertainty from calibration curve ranges from 1.1% to 9.4% in this work for LET ≥15 keV/µm. The considerable uncertainty comes from statistics in the bin consisting of LET spectrum because, (1) the LET of a track is found as a function of a power law equation 15 , (2) the binning of the LET spectrum 10,25 is very low resolution (the ratio of LET bin width to the center value of LET~10%), (3) given these two facts, small changes in the measurement of a track, due to AFM or optical microscope analysis or whatever, translate into only small changes in LET, and (4) because of the binning, small changes in LET usually do not translate into any change at all.…”

Section: Methodsmentioning

confidence: 72%

Contribution to dose in healthy tissue from secondary target fragments in therapeutic proton, He and C beams measured with CR-39 plastic nuclear track detectors

Kodaira

Kitamura

Kurano

et al. 2019

Sci Rep

View full text Add to dashboard Cite

The linear energy transfer (LET) spectrum, absorbed dose and dose equivalent from secondary particles of LET ∞ H 2 O ≥15 keV/μm deposited within the plateau of the Bragg curve in primary particle-induced nuclear target fragmentation reactions in tissue during proton and heavy ion radiotherapy were measured using CR-39 plastic nuclear track detectors and analyzed by means of atomic force microscopy. It was found that secondary target fragments contributed 20% to dose equivalent for primary protons (157 MeV), 13% for primary helium ions (145 MeV/n) and 4% for primary carbon ions (383 MeV/n), respectively. Little research has been done on the contribution from these particles to primary given dose. The smaller contribution measured for energetic carbon ion beams compared to proton beams can be considered an advantage of carbon ion radiotherapy over proton radiotherapy.

show abstract

Uncertainties in linear energy transfer spectra measured with track-etched detectors in space

Cited by 24 publications

References 19 publications

Out‐of‐field doses in pediatric craniospinal irradiations with 3D‐CRT, VMAT, and scanning proton radiotherapy: A phantom study

Out‐of‐field doses in pediatric craniospinal irradiations with 3D‐CRT, VMAT, and scanning proton radiotherapy: A phantom study

DOSIS & DOSIS 3D: long-term dose monitoring onboard the Columbus Laboratory of the International Space Station (ISS)

Contribution to dose in healthy tissue from secondary target fragments in therapeutic proton, He and C beams measured with CR-39 plastic nuclear track detectors

Contact Info

Product

Resources

About