[time-nuts] Fw: Helium and MEMS oscillators don;t mix well
artgodwin at gmail.com
Thu Nov 1 18:52:09 EDT 2018
This one definitely sounds more like the large induced voltages you get
when the magnetic fields are ramped. Could be the same with the earlier
report but that does have a few more features that are plausibly helium -
the recovery of the devices particularly.
On Thu, Nov 1, 2018 at 9:10 PM David Witten <wittend at wwrinc.com> wrote:
> Ok, one last try:
> From AuntMinnie.com, free but subscrip[tion-based newslettter for clinical
> radiologists and related staff:
> November 1, 2018 -- A second imaging facility is reporting problems with
> Apple devices that appear to be related to the operation of the center's
> MRI scanner. Nearly 10 late-model Apple iPhones and Watches were
> permanently disabled at a Delaware center after it ramped down its MRI
> CNMRI is an imaging facility in Dover, DE, that specializes in neurology
> and sleep medicine. It operates a 1.5-tesla MRI magnet and also performs
> studies such as polysomnography, nerve conduction, and home sleep studies,
> according to Dr. Robert Varipapa, a neurologist at the center.
> In mid-October, field service engineers from an imaging OEM arrived and
> ramped the magnet down and then back up again. Immediately thereafter,
> staff members at the center who owned Apple devices with wireless charging
> reported that their devices were disabled. Approximately eight or nine
> devices were affected, according to Varipapa.
> Only newer-model Apple products such as the iPhone 8 and iPhone 10 were
> affected, he added. Those with older models didn't experience any problems,
> nor did staff with Android phones.
> The Delaware center's experience is similar to that of an Illinois hospital
> that also reported conflict
> between its MRI scanner and iPhones. That site reported that nearly 40
> iPhones stopped working after the installation of a new MRI scanner. The
> problem was attributed to helium gas that may have leaked during the
> installation and found its way into the mechanical workings of the phones.
> But there are also crucial differences between the Illinois incident and
> the experience at the Delaware center. For one thing, the Delaware site
> never experienced a helium leak, to Varipapa's knowledge. Also, while the
> Illinois site reported problems with Apple models at the iPhone 6 level and
> above, in Delaware the problem was restricted to newer models with wireless
> charging -- no iPhone 6 devices were affected, Varipapa told
> Finally, at the Illinois hospital, some of the iPhones began working again
> after the helium inside the devices apparently dissipated. At CNMRI, all of
> the smartphones were permanently disabled, and staff had to get new ones.
> Varipapa said CNMRI's physicist told him that the center's experience is
> not an uncommon one. The physicist has heard that some field service
> engineers tell staff members to place smartphones in their cars' glove
> boxes when MRI magnets are being serviced, he said.
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