Arsenic-74 (⁷⁴As) is a radioactive isotope of arsenic with a half-life of 17.77 days. It decays through electron capture and beta decay, emitting gamma rays and X-rays. Due to these properties, ⁷⁴As has limited use in medicine and research.

Here are some applications:

* Medical imaging: ⁷⁴As can be used in positron emission tomography (PET) scans to image the distribution of arsenic in the body. This technique can help diagnose and monitor various medical conditions, including cancer and cardiovascular diseases.

* Radiopharmaceutical research: ⁷⁴As has potential as a radiolabel for various drugs and biomolecules, allowing researchers to track their distribution and metabolism in the body.

* Industrial applications: ⁷⁴As can be used as a tracer in industrial processes to study the flow of materials and identify leaks.

However, it's crucial to note that ⁷⁴As is a radioactive substance and handling it requires strict safety precautions. Exposure to radiation can lead to various health risks, including cancer.

Please remember that ⁷⁴As is not a common or widely used isotope. If you have specific questions about its use, consult a specialist in nuclear medicine or radiation safety.