Which method of radiation monitoring provides immediate results upon exposure?

The method of radiation monitoring that provides immediate results upon exposure is the Electronic Personal Dosimeter. These devices are designed to give real-time feedback to the user regarding radiation exposure levels. They use electronic sensors to measure the dose of radiation accumulated over time and can display this information immediately, allowing personnel to take timely precautions if they encounter higher levels of radiation.

In contrast, other methods, such as a Film Badge or Thermoluminescent Dosimeter, require processing after exposure to yield results, which can lead to delays in understanding the level of radiation exposure. The Optically Stimulable Luminescent Dosimeter (OSL) also necessitates a reading procedure, where the dosimeter must be analyzed in a controlled setting to generate a final dose assessment. Therefore, the speed at which an Electronic Personal Dosimeter provides results is its definitive advantage over traditional methods.