Does an MRI expose me to any unnecessary radiation?

No. Mri (magnetic resonance imaging) uses magnetic fields rather than radiation. That is one of the benefits of using MRI instead of ct ("cat scans") or x rays. As far as we know, exposure to this level of magnetic energy is not harmful. If you have a pacemaker, cochlear implant, implanted nerve stimulator, or other metal in your body, you may not be able to have an mri.
No. Mris do not use ionizing radiation but rather magnetic fields. During pregnancy this is a safe imaging procedure if needed to make a diagnosis.
Here is an example of an MRI questionnaire: http://www.Mrisafety.Com/screening_form/prescrnf.Pdf.
No. Mri does not use ionizing radiation. There are other safety concerns and before your scan you will be asked a series of questions to be sure the MRI is safe for you.