3ISO4037-1-1996:X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy partl:Radiation characteristics and production methods[S].
4Australasian College of Physical Scientists &Engineers in Medicine. Absorbed Dose Determination in Photonand Electron Beams : An adaptation of the IAEA Inter- national Codes of Practice[R]. 1998.11.
5P. J. Allisy - Roberts, D. T. Bums, C. Kessler. Meas- uring conditions used for the calibration of ionization chambers at the BIPM (2007).
6ISO4037 - 1 : X and gamma reference radiation for cal- ibrating dosemeters and doserate meters and for deter- mining their' response as a function of photon energy partl:Radiation characteristics and production meth- ods[S] ,1995.
8Z. Salehi Dehyagani, A. L. Yusoff. Spectrum Analy- sis with Monte Carlo Simulation, BEAMnrc, for Low Energy X - RAY [J]. World Academy of Science, Engineering and Technology 58,2011 : 723 - 725.
9Rogers DW O, Walters B, Kaw Rakow I. BEAMnrc users manual [R]. NRCC report PIRS 0509a,2005,1 -15.
10Rogers D W, Faddegon B A, Ding G X, et al. BEAM:A Monte Carlo code to simulate radiotherapy Therapy units [J] .Med Phys, 1995,22 ( 5 ) : 503 - 524.
