Response of tissue-equivalent ionization chamber to 15-MeV neutrons.
The calibration (in rad/nC) of an air-filled tissue-equivalent ionization chamber for neutrons of 15-MeV average energy was determined by measuring absolute fluences and calculating the kerma per unit fluence. The neutron calibration determined from the gamma-ray calibration and application of the Bragg-Gray relation was found to be 4% higher than that based on the fluence measurement. Additional data were taken to obtain calibration factors with tissue-equivalent gas; the same difference betwen the two methods was observed.
D005720:Gamma Rays; D005740:Gases; D009502:Neutrons; D009686:Nuclear Physics; D011879:Radiotherapy Dosage
D005740:Gases