Cytogenetic effects induced by accelerated carbon ions with shielding |
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Authors: | Z Z Wang W J Li B Q Wang B T Zhang J Z Xing X G Jing B R Dang W Wei W X Zhao |
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Institution: | (1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, China;(3) Xiangning People’s Hospital of Shanxi Province, Xiangning, China |
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Abstract: | Our work aims to understand the effects of shielding on the induction of biological damage by heavy charged particles and
to compare the shielding effects of different materials at the same LET from two aspects: the biological effectiveness including
or not including secondary particles emitted at large angles and the biological effectiveness at different angles with respect
to the beam direction. We designed and conducted biological experiments to determine the biological effectiveness of 200 MeV/u
carbon ions after traversing different shielding materials (Lucite and aluminium). Whole blood samples, which were either
attached to the shielding material (48 mm Lucite or 29 mm aluminium)or positioned at 300 cm away from it at different angles
with respect to the beam axis, were exposed to carbon ion beams. For comparison, whole blood samples were exposed directly
to 200 MeV/u carbon ions. Chromosomal aberrations in lymphocytes were scored. The results indicated that the biological effectiveness
per unit dose was not significantly changed by 48 mm Lucite or 29 mm aluminium, and no significant differences were observed
in lymphocytes attached to the target and in lymphocytes positioned at a distance of 300 cm away from the target, at 0o angle
of the beam axis. However, when plotted as a function of the number of ions hitting the shielding target, the curves are separated
and the shield increases the effectiveness per unit ion. The frequency of chromosomal aberrations at tilted angles behind
29 mm Al and 48 mm Lucite was almost the same. These lesions were considered to be caused by secondary particles due to the
passage of particles through the shielding materials. |
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