ultraviolet rays
alpha particules
x - rays
infrared rays
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While X-rays are commonly used in imaging techniques to detect cancerous growths, they are not typically used to directly destroy cancer cells. In contrast, alpha particles, which are high-energy helium nuclei, can be used in targeted radiation therapy to destroy cancer cells.
X-rays, as electromagnetic waves, are primarily used for diagnostic purposes in medicine, such as imaging to detect tumors or fractures. However, they are not typically used to directly destroy cancer cells. Radiation therapy for cancer treatment often involves the use of high-energy X-ray beams or other types of radiation, such as gamma rays, which are more effective at damaging and destroying cancerous cells.
therefore the answer is alpha particles 
