Author: Jin, H.F.
Paper Title Page
THPS064 Application of X-band 3.95 MeV Linac X-ray Source for On-site Bridge Inspection 3571
 
  • H.F. Jin, K. Demachi, K. Dobashi, T. Fujiwara, M. Uesaka, H. Zhu
    The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
  
  We de­vel­oped an X-ray non-de­struc­tive (NDT) sys­tem for on-site bridge in­spec­tion. A portable X-band (9.3-12 GHz) 3.95MeV lin­ear ac­cel­er­a­tor (linac) has been de­vel­oped for this sys­tem. The sys­tem con­sists of X-ray of 62kg with­out the tar­get col­lime­ter of 80kg, the RF power source of 62kg and other util­i­ty box of 116kg. For the on­site in­ves­ti­ga­tion, a flex­i­ble waveg­uide is used for this linac. And the linac is a point X-ray source. For X-ray de­tec­tion, we chose 8-inch square size scin­til­la­tion type flat panel de­tec­tor. The spa­tial res­o­lu­tion of the de­tec­tor is as high as 0.2mm, which is man­u­fac­tured by Perkin Elmer Co. Cd2O2S:Tb is used for the scin­til­la­tor crys­tal. The ca­pa­ble ra­di­a­tion en­er­gy range is 40keV to 15MeV. In order to re­al­ize quick in­spec­tion for a bridge, re­mote con­trol robot which han­dles and com­pact X-ray source and de­tec­tor are de­sired. There­fore, we de­vel­oped 3D lo­ca­tion sys­tem for this robot. The lo­cat­ing sys­tem is re­al­ized with image pro­cess­ing with its cam­era. For the op­er­a­tion, stereo­scop­ic ra­dio­graph­ic image is taken and an­a­lyzed, and com­put­ed to­mog­ra­phy (CT) image anal­y­sis is taken for de­tailed in­spec­tion.
Non-destructive test (NDT) , X-ray Source, X-band, Linac, Detector, Computed Tomography (CT). 		 
 
THPS065 Upgraded X-band 950 KeV Linac X-ray Source for On-site Inspection at Petrochemical Complex 3574
 
  • M. Jin, K. Demachi, K. Dobashi, H.F. Jin, T. Natsui, M. Uesaka
    The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
  • J. Kusano, N. Nakamura, M. Yamamoto
    Accuthera Inc., Kawasaki, Kanagawa, Japan
  • E. Tanabe
    AET, Kawasaki-City, Japan
  
  Ab­stract―Our portable X-band (9.3GHz) 950KeV linac has been suc­cess­ful­ly up­grad­ed. The prob­lems of RF power os­cil­la­tion, beam cur­rent os­cil­la­tion and re­duc­tion and fi­nal­ly lack of X-ray in­ten­si­ty were solved by re­plac­ing the axial cou­pling cav­i­ties with the side-cou­pled ones. De­signed X-ray dose rate of 0.05 Sv/min@​1m is going to be achieved. Length of the ac­cel­er­at­ing tube is re­duced to less than 25 cm. X-ray source part with the local ra­di­a­tion shield­ing is con­nect­ed by the flex­i­ble waveg­uide with the box of the 300 kW　mag­netron and cool­ing unit. The total sys­tem con­sists of the three suit-case-size units, the last of which is one for the elec­tric power sup­ply. Even on-line dy­nam­ic trans­mis­sion imag­ing is avail­able by using the high in­ten­si­ty X-ray cam­era. Demon­stra­tion of the mea­sure­ment of wall thin­ning of metal pipes with thick ther­mal shield­ing is under way. Up­dat­ed mea­sure­ment re­sults will be pre­sent­ed. KEY­WORDS: portable X-band linac X-ray source, on-site high en­er­gy X-ray in­spec­tion, petro­chem­i­cal com­plex