Evolution of potato contamination level (Bq.kg⁻¹) during the study period. Data were collected from three different institutions namely the sanitary and epidemiology station (SES, circles), the center for the promotion of radiation protection culture (CPRC, diamonds) and the veterinary station (Vet st, triangles). The horizontal dashed line represents the RPL99 level for potatoes (see Tab. 2) and the open symbols indicate measurements at or under the detection limit (see Tab. 1).