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IJPAP Vol.50 [2012] >
IJPAP Vol.50(07) [July 2012] >
| Title: | Monte Carlo simulation and measurement of X-ray dose from 9 MeV RF electron LINAC for cargo scanning |
| Authors: | Chaudhary, Nishant
Bhattacharjee, D
Yadav, V
Sharma, S D
Acharya, S
Dixit, K P
Mittal, K C |
| Keywords: | GEANT4
Monte Carlo
Ionization chamber
Cargo-scanning |
| Issue Date: | Jul-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The 9 MeV RF Electron Linear
Accelerator (Linac) is operational at Electronic Corporation of India Limited
(ECIL), Hyderabad to demonstrate cargo-scanning applications to prevent the
transport of contraband objects. The
interrogation is done by a fanned X-ray beam produced by impinging an energetic
electron beam on tantalum (Ta) target. The desired dose rate for this purpose
is 22 Gy/min at 1 m from the X-ray source. It is required to determine
the X-ray dose rate at one meter distance from the X-ray converter for a given
set of beam parameters. Monte Carlo simulations have been done for the
X-ray dose rate measurement by using Geant4 software toolkit. X-ray dose rate values at 1 m distance from X-ray
target have been estimated at various polar angles with respect to the
direction of the incident beam. The plot shows angular distribution of
significant X-ray intensity in a cone of 15° half-angle. The maximum X-ray emission is in the
forward direction of the beam and the dose-rate is estimated to be 19.40 Gy/min
when the beam parameters are (i) 9 MeV energy
(ii) 60 mA peak beam current and (iii) 250 Hz pulse repetition frequency (PRF).
Experiments
have also been carried out using air ionization chamber to obtain X-ray
dose-rate at 1 m distance from target. The measured value without an
electron-stopper after the target is 20.63 Gy/min at 1 m distance which is
close to the required dose rate for the actual cargo scanning purpose. The
simulated results also closely match with the experimental observations,
implying that the present simulation model is suitable for the characterization
of an X-ray source for cargo scanning applications. |
| Page(s): | 517-519 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.50(07) [July 2012]
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