title: Extended study for performances of beam quality indicator.
abstract: The performance of the beam quality indicator (BQI) was studied for confirmation of its reliability. An original BQI (named "BQI.org") and five newly designed BQIs (named "BQI.001-BQI.005") were compared with a variety of imaging systems with different beam spectra. With the best quality of a BQI image obtained, the data was carefully analyzed, and +/-1% precision was expected. However, a +/-7% systematic uncertainty was observed for imaging systems, including a difference of BQIs. Spectra of attenuation coefficients were measured using a TOF method for Pb and Ti, which was used to define a calibration curve for the BQIs. The curve will be compared with the previously defined calibration curve for the BQI.org.
authors.affiliation: Institute for Atomic Energy, Rikkyo University, 2-5-1 Nagasaka, Yokosuka 240-0101, Japan. hkobarur@aol.com
authors.forename: Hisao
authors.initials: H
authors.lastname: Kobayashi