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115 In as a probe for the characterization of therapy bremsstrahlung beams and the detection of photoneutrons
Author(s) -
Krmar M.,
Slivka J.,
Bikit I.,
Čonkić Lj.,
Rudić A.
Publication year - 1999
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.598558
Subject(s) - bremsstrahlung , physics , dosimetry , characterization (materials science) , nuclear physics , medical physics , nuclear medicine , medicine , optics , photon
Variation of the photoactivation rate across radiation fields of three different bremsstrahlung beams of two medical accelerators has been measured, making use of the photonuclear reactions in natural indium probes:115 In ( γ , γ ′ )115 mIn and115 In ( γ , n )114 mIn . The third nuclear reaction,115 In ( n , γ )116 mIn , was used to detect the presence of neutrons in the photon beam and to estimate the spatial distribution of thermal and fast neutrons in the patient plane as a function of collimator opening.