131 iodine gamma dose determination in the thyroid gland using two geometrical shapes: a comparative study

In order to study the internal gamma dose, we used a Monte Carlo code 'Penelope' simulation with two geometrical models (cylindrical and spherical). The deposited energy was determined via the loss of energy calculated from the quantum theory for inelastic collisions based on the first-ord...

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Bibliographic Details
Published in:Physica scripta 2015-05, Vol.90 (5), p.55002-6
Main Authors: Betka, A, Bentabet, A, Azbouche, A, Fenineche, N, Adjiri, A, Dib, A
Format: Article
Language:English
Subjects:
Computer simulation
Deposition
Dosage
dose gamma
Exact solutions
Inelastic collisions
Iodine
iodine 131
Mathematical analysis
Monte Carlo simulation
Photons
thyroid gland
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Summary:In order to study the internal gamma dose, we used a Monte Carlo code 'Penelope' simulation with two geometrical models (cylindrical and spherical). The deposited energy was determined via the loss of energy calculated from the quantum theory for inelastic collisions based on the first-order (plane-wave) Born approximation for charged particles with individual atoms and molecules. Our results show that the cylindrical geometry is more suitable for carrying out such a study. Moreover, we developed an analytical expression for the 131 iodine gamma dose (the energy deposited per photon absorbed dose). This latter could be considered as an important tool for evaluating the gamma dose without going through stochastic models.
ISSN:0031-8949
1402-4896
DOI:10.1088/0031-8949/90/5/055002