http://www.ti.com/lit/wp/sboa154/sboa154.pdf
BTW according to TI's support forum, the MSP430F chips with FRAM are not rated to withstand the high levels of gamma radiation used in medical sterilization.
However, Maxim does have many parts rated for that type of application, with "non-floating gate" NV memories. (Draw your own conclusions about what they are referring to.) https://www.maximintegrated.com/en/app-notes/index.mvp/id/60...
Edit: And of course there are oxides, but you can margin around the assymetric Vt-shift that occurs in the transistors.
Edit 2: At least one part explicitly states in the data sheet that it uses FRAM. https://datasheets.maximintegrated.com/en/ds/DS28E84.pdf