A General Theory of Cavity Ionisation

Burlin, T. E.

doi:10.1259/0007-1285-39-466-727

Cited by 183 publications

(91 citation statements)

References 14 publications

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“…We apply Burlin cavity theory (Burlin, 1966) to relate the dose absorbed by the plastic scintillator to that of water. Burlin cavity theory is appropriate for cavities of intermediate size, where the cavity is not only too large to use Bragg-Gray theory, but also too small to assume the charged particles generated by photon interactions within the cavity deposit their energy completely therein.…”

Section: Energy Dependencementioning

confidence: 99%

Plastic scintillation dosimetry and its application to radiotherapy

Beddar

2006

Radiation Measurements

173

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Section: Energy Dependencementioning

confidence: 99%

Plastic scintillation dosimetry and its application to radiotherapy

Beddar

2006

Radiation Measurements

173

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“…Since 2000, Al2O3:C powder mixed with a polyester binder and coated onto a roll of polystyrene film has been used by the company LANDAUER [4]. In 2006, the performance of a film based on Al2O3:C was studied at radiation oncology and nuclear accident dose levels [5,6]. In 2011, Nakhaei et al produced PVA/CaF2 nanoparticle films with different amounts of CaF2 nanoparticles [7].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Simulations of Thin Films Loaded With Osl Detectors

Mirzajani¹,

Souza²,

D’Errico³

2017

RAD Conference Proceedings

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Abstract. The transport and interactions of gamma-rays in a thin film loaded with optically stimulated luminescence (OSL) nanoparticles (NPs) were studied by Monte Carlo (MC) simulations with the Particle and Heavy Ion Transport code System (PHITS). In the MC input file, the geometry of the thin film was treated as a virtual space using a cubic voxel structure with a lattice of nanoparticles (NPs) of OSL CaF2:Ce. The particles were monodispersed, ranging in size from 50 to 600 nm. The polyvinyl chloride (PVC) film matrix was treated as an array simulating a small sample with an area of 13.8 µm by 13.8 µm and a thickness of 10.2 µm. For the irradiation simulations, we considered a collimated beam of cesium-137 gamma-rays of 662 keV impinging perpendicularly on the piece of thin film (detector). The film was centered on the front face of 30 cm x 30 cm x 15 cm ISO water slab phantom. In the MC simulations, we followed the radiation tracks and calculated the energy deposition from the tracks of electrons produced by the interaction histories of the photons crossing the thin film. The energy deposition in the OSL film is initially fairly constant with grain size and then increases as the CaF2:Ce grains get larger to the point of filling 50% of the voxel volume. For grain sizes up to almost 400 nm, the presence of the grains has minimal impact, i.e., the dose is mainly deposited by secondary electrons generated within the polymer. This allows for the design of tissueequivalent dosimeters even with embedded OSL materials, such as CaF2, that exhibit a higher Z-value than tissue.

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“…In this case low energy charged particles can stop within the cavity, leading to a change of the energy fluence over the cavity volume. Developments of the Bragg-Gray theory by Spencer-Attix [19], Burlin [20] and Horowitz [21] deal with changes in the charge particle spectrum across the cavity. Detailed discussions of these theories are beyond the scope of the present article.…”

Section: The Ionisation Chambermentioning

confidence: 99%

Fundamentals of Radiation Dosimetry

Bos¹

2011

AIP Conference Proceedings

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The basic concepts of radiation dosimetry are reviewed on basis of ICRU reports and text books. The radiation field is described with, among others, the particle fluence. Cross sections for indirectly ionizing radiation are defined and indicated is how they are related to the mass energy transfer and mass energy absorption coefficients. Definitions of total and restricted mass stopping powers of directly ionizing radiation are given. The dosimetric quantities, kerma, absorbed dose and exposure together with the relations between them are discussed in depth. Finally it is indicated how the absorbed dose can be measured with a calorimeter by measuring the temperature increase and with an ionisation chamber measuring the charge produced by the ionizing radiation and making use of the Bragg-Gray relation.

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A General Theory of Cavity Ionisation

Cited by 183 publications

References 14 publications

Plastic scintillation dosimetry and its application to radiotherapy

Plastic scintillation dosimetry and its application to radiotherapy

Monte Carlo Simulations of Thin Films Loaded With Osl Detectors

Fundamentals of Radiation Dosimetry

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