introduction: the purpose of this work was to study the ability of mri normoxic polymer gel dosimetry for evaluating the dose distribution in hdr brachytherapy of esophagial cancer at imam reza brachytherapy center (mashhad, iran). materials and methods: initially, 2liters of normoxic gel (magic) was fabricated and then poured into 12 calibration test tubes and placed in a perspex walled phanto...

In the present work, the correlated sampling technique in Monte Carlo calculations related to diamond dosimetry and graphite calorimetry will be described. The egs_chamber and DOSRZnrc user-codes included in the EGSnrc package are used. Egs_chamber is already provided with routines enabling the use of correlated sampling while an in-house implementation of this technique was made in the origina...

For the purpose of dose measurement using a high-dose rate (192)Ir source, four methods of thermoluminescent dosimeter (TLD) calibration were investigated. Three of the four calibration methods used the (192)Ir source. Dwell times were calculated to deliver 1 Gy to the TLDs irradiated either in air or water. Dwell time calculations were confirmed by direct measurement using an ionization chambe...

max. 2000 char.): A comparison of dosimetry methods at different clinics can be used as a means to uncover systematic uncertainties in radiotherapy. To assess the current status of reference dosimetry and small-field dosimetry in clinical practice, a collaborative comparison study involving several dosimetry methods was performed by DTU Nutech at six Danish clinics. The first part of the interc...

introduction: multiple fields and presence of heterogeneities create complex dose distributions that need three dimensional dosimetry. in this work, we investigated mr-based magic gel dosimetry as a three-dimensional dosimetry technique to measure the delivered dose to bladder and rectum in prostate radiation therapy. materials and methods: a heterogeneous slab phantom including bones was made....

objective(s): in this study we evaluate the impact of the different aspects of gold nano-particles (gnps) on the target absorptive dose enhancement factor (def) during external targeted radiotherapy with photon beams ranging from kilovolt to megavolt energies using monte carlo simulation. methods: we have simulated the interaction of photon beams with various energies of radiation using water s...

This study analyses the thermally stimulated luminescence (TSL) or thermoluminescence glow curve between 300 and 773 K of germanium-doped silica optical fibre and finds a main glow peak at around 500 K with a characteristic spectral emission centred at 400 nm. Both features are particularly suitable for dosimetry. Thus, an investigation by the TSL technique of some first clinically relevant fea...

A quality assurance method that utilizes 3D dosimetry and facilitates clinical interpretation Oldham Mark; Thomas Andrew; O'Daniel Jennifer; Juang Titania; Ibbott Geoffrey; Adamovics John; Kirkpatrick John P International journal of radiation oncology, biology, physics (2012), 84(2), 540-6. PURPOSE: To demonstrate a new three-dimensional (3D) quality assurance (QA) method that provides comprehe...

Radiation dosimetry by Fricke gel was largely used, generally focused and optimized for radiotherapy applications therefore involving relative high dose levels. Fricke gel dosimetry has several advantages, like dose rate and LET almost independence, 3D mapping, among other. This work presents a novel Fricke gel dosimeter optimized for low dose levels. Several chemical composition were studied v...