Monte Carlo simulation of energy absorbed in phenolic ESR dosimeters added with gadolinium exposed to thermal, epithermal and fast neutrons

Giorgio Collura, Antonio Bartolotta, Salvatore Gallo, Maurizio Marrale, Anna Longo, Marrale, Longo, Collura, Salvatore Gallo

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

In this work analyses of the energy released per unit mass in phenolic compound exposed to neutronbeams were performed with the aim of predicting the increase in dose achievable by addition of gadolinium(Gd) inside the pellets. In particular, Monte Carlo (MC) simulations were carried out for IRGANOX1076 phenolic compound irradiated with neutron beams with different energy spectra at various depthsinside a water phantom. The addition of gadolinium increases sensitivity of phenolic ESR (electron spinresonance) dosimeters to neutrons thanks to the high gadolinium cross section for neutron capture and tothe large number of secondary particles (mainly Auger and internal conversion electrons) which are ableto release energy inside the sensitive material layers. For small depths in water phantom and low energyneutron spectra the increase in dose due to gadolinium is large (more than a factor 50). The enhancementis smaller in case of epithermal neutron beam, whereas the increase in dose for fast neutrons is less than50%. In order to have a comparison with other ESR dosimeters the energy released per unit mass in phenoliccompound was compared with that calculated in alanine pellets. For thermal neutron beams theenergy released in phenolic compound with gadolinium is comparable to that released in alanine forsmall depths in phantom, whereas it is larger than in alanine for large depths. In case of epithermaland fast neutron beams the energy released in phenolic compound is larger than in alanine samplesbecause the elastic scattering with hydrogen nuclei is more probable for high neutron energies and thisphenolic compound is characterized by an higher number of 1H nuclei than alanine. All results here foundsuggest that these phenolic pellets could be fruitfully used for dosimetric applications in Neutron CaptureTherapy.
Lingua originaleEnglish
pagine (da-a)21-28
Numero di pagine8
RivistaNUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Stato di pubblicazionePublished - 2017

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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