Which of the following is not a form of cooling used in laser treatments?

Radiation cooling is not a recognized method of cooling used in laser treatments. Instead, effective cooling mechanisms during laser hair removal typically aim to protect the skin from the heat generated by the laser. Cryogenic cooling involves the application of extremely cold substances to cool the skin quickly, while topical gels can provide a soothing effect by dissipating heat and preventing skin damage. Forced cold air is another common technique that uses a stream of cool air to lower the temperature of the skin instantly during the procedure. These methods are designed to enhance patient comfort and safety while ensuring effective hair removal. In contrast, radiation cooling does not pertain to a practical or established technique in this context.