AIIMS 2017 Physics Cancer Treatment Assertion Reason Question
In the following questions, a statement of assertion is given followed by a corresponding statement of reason.
Assertion: A beam of charged particles is employed in the treatment of cancer.
Reason: Charge particle on passing through a material medium lose their energy by causing ionization of the atom along their path
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Option C is correct because charged particle beams, such as protons or heavy ions, primarily lose energy through ionization processes when they interact with tissue, effectively damaging cancer cells while minimizing harm to surrounding healthy cells. This ionization occurs as the charged particles collide with atoms in the medium, leading to the ejection of electrons and the formation of ion pairs, which is crucial for the therapeutic effect in radiation oncology.
Other options may incorrectly suggest that the energy loss mechanisms are solely due to other processes, such as electromagnetic radiation or non-ionizing interactions, which are less effective for cancer treatment. Understanding the specific interactions of charged particles with biological tissues is essential for optimizing radiation therapy techniques.
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