Comparison of two thermal probe technologies for the dosimetric investigations of RF exposure systems

Exposure to radiofrequency waves (RF) happens everyday but little is know about the potential induced toxicity. It is therefore essential to carry out studies with rigorous experimental protocols and accurate dosimetry. To do this, we can characterize the dosimetric characteristics, namely the specific absorption rate (SAR) of the emitted RF waves and the induced thermal increment by monitoring the temperature over time. Different types of thermal probes may be used for such a study. We were interested in comparing two types of probes that can be used in conditions suitable for in vitro measurements, in a traditional biological consumable, 96-well plate. Such particular conditions require extreme precision in the positioning of the probe, its sensitivity and its measurement accuracy. We have chosen to compare a microscale thermocouple, an inexpensive but often criticized technology as it is metallic and therefore capable of interfering with the electromagnetic field, with a much more expensive fiber optic probe. We have highlighted the advantages and disadvantages of each in the context of this specific type of measurement.