Estimote and Third Party interference

This e-mail is in reference with our query regarding estimote proximity and whether it affects by any third party interference. We are having a query from one of our client who would be using location beacons to identify positioning of a person on a floor. The floor have MRI scanner devices next door and we are curious to know whether in any case would it affect beacons proximity or strength? Please clarify if there might be fluctuation in the beacon’s signal due to MRI scanner interface or will it behaves naturally as it does.