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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(11) [November 2010] >
| Title: | Estimation of radiation source term and concrete shield thickness for low energy particle accelerators |
| Authors: | Joshi, D S
Sarkar, P K |
| Keywords: | Particle accelerators
Radiation source term
Shield thickness
Bremsstrahlung radiation
Neutron radiations |
| Issue Date: | Nov-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Electron beams with
varying energy (0.5-15 MeV) have been extensively used for processing of
various materials. Main source of radiation is bremsstrahlung radiations
(X-rays) generated when electron beam strikes high Z materials. The emergent
spectra have angular distribution and with increasing electron energy X-ray
emission rate peaks in the forward direction. Photo neutron generation in such
electron accelerator is less significant as it generates after certain
threshold energy. The accelerated protons interact with matter and lead to the
primary radiological hazards, which consist of prompt radiation (neutrons and
gamma). Another source is delayed radiation which is due to induced
radioactivity in accelerator component. Thus, in electron accelerator
bremsstrahlung radiation and in proton accelerator, neutrons are the main
sources of radiation that decide the shield thickness. The emergent radiation
has angular distribution and accordingly shield thickness also varies.
Radiation source terms are evaluated for 3, 7, 10 and 15 MeV electron beam and
10/20 MeV proton beam accelerator. Required concrete shield thickness for
housing these accelerators is also evaluated and presented in this paper. Emergent
radiation yield values are verified by Monte Carlo
stimulations and are found to be in good agreements. |
| Page(s): | 771-773 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.48(11) [November 2010]
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