title: Analysis of MCNP simulated gamma spectra of CdTe detectors for boron neutron capture therapy.
abstract: The next step in the boron neutron capture therapy (BNCT) is the real time imaging of the boron concentration in healthy and tumor tissue. Monte Carlo simulations are employed to predict the detector response required to realize single-photon emission computed tomography in BNCT, but have failed to correctly resemble measured data for cadmium telluride detectors. In this study we have tested the gamma production cross-section data tables of commonly used libraries in the Monte Carlo code MCNP in comparison to measurements. The cross section data table TENDL-2008-ACE is reproducing measured data best, whilst the commonly used ENDL92 and other studied libraries do not include correct tables for the gamma production from the cadmium neutron capture reaction that is occurring inside the detector. Furthermore, we have discussed the size of the annihilation peaks of spectra obtained by cadmium telluride and germanium detectors.
authors.affiliation: Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; HUS Medical Imaging Center, Helsinki University Hospital, POB 340, FI-00029 HUS, Finland. Electronic address: alexander.winkler@helsinki.fi.
authors.forename: Alexander
authors.initials: A
authors.lastname: Winkler
authors.affiliation: Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; HUS Medical Imaging Center, Helsinki University Hospital, POB 340, FI-00029 HUS, Finland.
authors.forename: Hanna
authors.initials: H
authors.lastname: Koivunoro
authors.affiliation: Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; HUS Medical Imaging Center, Helsinki University Hospital, POB 340, FI-00029 HUS, Finland.
authors.forename: Sauli
authors.initials: S
authors.lastname: Savolainen
mesh_terms: D001895:Boron / Q000032:analysis; D016754:Boron Neutron Capture Therapy / Q000379:methods* / Q000706:statistics & numerical data; D019187:Cadmium Compounds; D003198:Computer Simulation; D006801:Humans; D007554:Isotopes / Q000032:analysis; D009010:Monte Carlo Method; D009369:Neoplasms / Q000000981:diagnostic imaging / Q000378:metabolism / Q000532:radiotherapy; D019047:Phantoms, Imaging; D011874:Radiometry / Q000706:statistics & numerical data; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000706:statistics & numerical data; D013051:Spectrometry, Gamma / Q000706:statistics & numerical data; D013691:Tellurium; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: C000615219:Boron-10; D019187:Cadmium Compounds; D007554:Isotopes; D001895:Boron; D013691:Tellurium; C028337:cadmium telluride
keywords: Annihilation peak; BNCT; CdTe/CdZnTe (CZT); MCNP; Neutron detection; Prompt gamma spectrum