dB. During the whole measurement period, the observed location was secured, and only authorized technical personnel had access to provide measurement conditions of the unperturbed field [3], [11]. The distances between the signal sources and receiving position were not considered; we concentrated on general exposure assessment. Due to the relatively high sensitivity of the EME Spy 140 probe, all sampled EFSs stored in the PEM memory were above the lower detection limit. UMTS Dosimeter Measurements: Experimental Results Fig. 7 presents the temporal variations of EFS over the first week for the UMTS downlink band. All measurements aimed at starting at 8 a.m. until 8 a.m. the next day. Table 2 summarizes the values of the instantaneous EFS (Emin denotes the minimum EFS above the lower sensitivity level of EME Spy 140). Analyzing the results of the obtained EFS parameters Fig. 7. Temporal variations of EFS and exposed energy density for UMTS downlink band, first week. 10 IEEE Instrumentation & Measurement Magazine December 2020