The present disclosure provides a heavy atom carrier and a method of treating cancer using the heavy atom carriers in conjunction with monochromatic X-ray. The heavy atom carriers are halogen-containing heavy atom carriers.本發明涉及一種重原子載體以及使用該重原子載體和單色X射線偕同治療癌症的一方法。該重原子載體為具有鹵素的重原子載體。