Plastic scintillation dosimetry: Optimal selection of scintillating fibers and scintillators

Journal Article · Fri Jul 15 04:00:00 EDT 2005 · Medical Physics

DOI:https://doi.org/10.1118/1.1943807· OSTI ID:20726089

Archambault, Louis; Arsenault, Jean; Gingras, Luc; Sam Beddar, A; Roy, Rene; Beaulieu, Luc ^[1]

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1. Departement de Radio-Oncologie et Centre de Recherche en Cancerologie, Hotel-Dieu de Quebec, 11 cote du palais, Quebec, Quebec G1R 2J6 (Canada) and Departement de Physique, de Genie Physique et d'Optique, Universite Laval, Quebec, Quebec (Canada)

Scintillation dosimetry is a promising avenue for evaluating dose patterns delivered by intensity-modulated radiation therapy plans or for the small fields involved in stereotactic radiosurgery. However, the increase in signal has been the goal for many authors. In this paper, a comparison is made between plastic scintillating fibers and plastic scintillator. The collection of scintillation light was measured experimentally for four commercial models of scintillating fibers (BCF-12, BCF-60, SCSF-78, SCSF-3HF) and two models of plastic scintillators (BC-400, BC-408). The emission spectra of all six scintillators were obtained by using an optical spectrum analyzer and they were compared with theoretical behavior. For scintillation in the blue region, the signal intensity of a singly clad scintillating fiber (BCF-12) was 120% of that of the plastic scintillator (BC-400). For the multiclad fiber (SCSF-78), the signal reached 144% of that of the plastic scintillator. The intensity of the green scintillating fibers was lower than that of the plastic scintillator: 47% for the singly clad fiber (BCF-60) and 77% for the multiclad fiber (SCSF-3HF). The collected light was studied as a function of the scintillator length and radius for a cylindrical probe. We found that symmetric detectors with nearly the same spatial resolution in each direction (2 mm in diameter by 3 mm in length) could be made with a signal equivalent to those of the more commonly used asymmetric scintillators. With augmentation of the signal-to-noise ratio in consideration, this paper presents a series of comparisons that should provide insight into selection of a scintillator type and volume for development of a medical dosimeter.

• OSTI ID: 20726089
• Journal Information: Medical Physics, Journal Name: Medical Physics Journal Issue: 7 Vol. 32; ISSN 0094-2405; ISSN MPHYA6
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
ASYMMETRY
COMPARATIVE EVALUATIONS
CYLINDRICAL CONFIGURATION
DOSEMETERS
DOSIMETRY
EMISSION SPECTRA
OPTICAL FIBERS
PLASTIC SCINTILLATORS
RADIOTHERAPY
SCINTILLATIONS
SIGNAL-TO-NOISE RATIO
SPATIAL RESOLUTION
SURGERY