Measurement of the dose equivalent of leakage radiation through an isocentric gantry used for neutron therapy

1988 ◽  
Vol 15 (4) ◽  
pp. 618-620 ◽  
Author(s):  
J. L. Horton ◽  
P. M. Stafford ◽  
P. Kliauga
Keyword(s):  
Dose Equivalent ◽  
Neutron Therapy ◽  
Leakage Radiation ◽  
Isocentric Gantry

The RBE of the leakage radiation from the Hiletron neutron therapy unit

1983 ◽  
Vol 56 (668) ◽  
pp. 551-558 ◽  
Author(s):  
F. Chen ◽  
J. H. Hendry ◽  
G. Chu ◽  
D. Greene ◽  
M. Bianchi
Keyword(s):  
Neutron Therapy ◽  
Leakage Radiation

Neutron dose evaluation of Elekta Linac at two energies (10 & 18 MV) by MCNP code and comparison with experimental measurements

2014 ◽  
Vol 6 (1) ◽  
pp. 1006-1015
Author(s):  
Negin Shagholi ◽  
Hassan Ali ◽  
Mahdi Sadeghi ◽  
Arjang Shahvar ◽  
Hoda Darestani ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Measurement Data ◽  
Calculated Data ◽  
High Energy ◽  
Neutron Dose ◽  
Dose Assessment ◽  
Photon Flux ◽  
Dose Equivalent ◽  
Monte Carlo Techniques ◽  
Neutron Dose Equivalent

Medical linear accelerators, besides the clinically high energy electron and photon beams, produce other secondary particles such as neutrons which escalate the delivered dose. In this study the neutron dose at 10 and 18MV Elekta linac was obtained by using TLD600 and TLD700 as well as Monte Carlo simulation. For neutron dose assessment in 2020 cm2 field, TLDs were calibrated at first. Gamma calibration was performed with 10 and 18 MV linac and neutron calibration was done with 241Am-Be neutron source. For simulation, MCNPX code was used then calculated neutron dose equivalent was compared with measurement data. Neutron dose equivalent at 18 MV was measured by using TLDs on the phantom surface and depths of 1, 2, 3.3, 4, 5 and 6 cm. Neutron dose at depths of less than 3.3cm was zero and maximized at the depth of 4 cm (44.39 mSvGy-1), whereas calculation resulted  in the maximum of 2.32 mSvGy-1 at the same depth. Neutron dose at 10 MV was measured by using TLDs on the phantom surface and depths of 1, 2, 2.5, 3.3, 4 and 5 cm. No photoneutron dose was observed at depths of less than 3.3cm and the maximum was at 4cm equal to 5.44mSvGy-1, however, the calculated data showed the maximum of 0.077mSvGy-1 at the same depth. The comparison between measured photo neutron dose and calculated data along the beam axis in different depths, shows that the measurement data were much more than the calculated data, so it seems that TLD600 and TLD700 pairs are not suitable dosimeters for neutron dosimetry in linac central axis due to high photon flux, whereas MCNPX Monte Carlo techniques still remain a valuable tool for photonuclear dose studies.

Fast Neutron Therapy

1972 ◽  
Vol 12 ◽  
pp. 11-32 ◽  
Author(s):  
W. Duncan
Keyword(s):  
Fast Neutron ◽  
Neutron Therapy ◽  
Fast Neutron Therapy
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