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This is interesting. I found it completely by accident looking for something else this morning.

OFFICER SAFETY WARNING

Magnetic Resonance Imaging (MRI) Unit Causes
Malfunction of Officer’s Issue Firearm

In July 2001, an officer from the Manheim Township (Lancaster County, Pennsylvania) Police Department had an incident where his issue firearm malfunctioned. The Smith & Wesson, Model 4013, .40 S&W caliber, semi-automatic pistol was found to have a magnetized firing pin, which stuck to the side of the channel within the slide. Upon inspection, it was determined that the entire pistol had become so magnetized that paper clips actually stuck to any metal surface. The department armorer was able to demagnetize the firearm with the use of a high-power, videotape-erasing unit after complete disassembly.

When the malfunction was discovered, the officer had no idea of when or how his pistol had become magnetized. A review of the officer’s activities, revealed that he had investigated a burglar alarm call at a medical office that was equipped with a Magnetic Resonance Imaging (MRI) unit. During the investigation, the officer had walked into the MRI suite that magnetized the pistol. MRI medical personnel have detailed instructions on safety, which include keeping metal objects away from the unit. Upon further inspection, two additional officer’s firearms were also found to have been magnetized.

RECOMMENDATION

ALL ISSUE FIREARMS SHOULD BE CHECKED FOR THIS CONDITION

Police department and medical facility security administrative personnel should notify officers of the following:

Investigations within medical facilities could magnetize an issue firearm rendering it inoperable.

The test to determine if a firearm has become magnetized is to place a paper clip next to the firearm.

If the paper clip sticks to the firearm, a supervisor should be notified immediately.

A trained department-designated officer should verify the firearm is magnetized and the firearm should be demagnetized with the use of a high-powered videotape-erasing unit after it has been completely disassembled.

The firearm should be test fired prior to being returned to service.

The fact that there is no outward sign that a firearm may not function as a result of MRI/magnetic exposure makes this problem difficult to detect. Awareness of this situation may prevent serious or deadly consequences.

Source: Sing, Lieutenant Douglas K. Manheim Township (Lancaster County, Pennsylvania) Police Department Revised March 2002.

http://www.afte.org/announcements/offsafetymri.htm
 

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That was on CSI last week. The gun and the bullets were magnetized and that's how they caught the BG.

It was kinda cool, the bullets they pulled out of the dead guy stuck to each other. I don't know how they magnetized lead though???
 

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Lead will not magnetize, IIRC.

Matt
 

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Matt - moved this to general guns discussion!

Indeed, lead is non magnetic but for sure - a high intensity field sure could magnetize a steel gun enough to present a problem. Not that we would consider that as being a very likely event.

Stainless is relatively non-magnetic - at least compared with std steel.

Haha - this is where the ''all ceramic'' Glock could score eh?! LOL! :wink:
 
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P95Carry said:
Haha - this is where the ''all ceramic'' Glock could score eh?! LOL! :wink:
Shhhh…

the first rule of the ceramic Glock is we don’t talk about the ceramic Glock.
 

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RSSZ said:
Don't believe this for a second. Answered an alarm means to me that the buisness was closed,which means the MRI was OFF. This is a HUH ?? story. + what P95 said. -------
Not so, sir. The machine still produces a hefty magnetic field while in the standby mode. The main magnets are superconductive devices, and cannot just be flipped on and off like a lamp.

Univ. of Chicago Training Manual said:
MRI Hazards

The MRI contains a very powerful magnet. This magnet is always turned on, even when the machine is not scanning, including all night, every night, every weekend, and even holidays. This magnet is so strong that it will pull heavy items (such as oxygen cylinders, beds, and stretchers) into the scanner.

The magnet attracts all ferro(iron)-magnetic objects, including:

Implants in patients or staff
Objects in pockets
Tools and equipment
These objects are attracted by the magnet. Such objects can become powerful projectiles and can cause serious injury or death. Patients and others have been killed in this way.

http://academyconnect.uchospitals.edu/v1/2511/251103a.html
The only time the magnetic field is not at a high level is if the machine is completely shut down, which takes a long time to restart from. An emergency field quench, which does rapidly stop the magnetic field, causes thousands of dollars of damage to the machine.

Matt
 

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With a seven figure pricetag - and the first figure is not a 1 - they better be a bit more complex :biggrin:

Matt
 

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We have two MRIs at my clinic. Personal electronics, metal implants in your body, credit cards, some types of watches and hearing aids all fare very poorly within the MRI magnetic field. There was a report in the literature a few years back, in which an inadequately restrained oxygen tank broke loose from its moorings, was pulled right into the bore of the MRI and struck a patient on the head, killing them. I wonder if an active field could generate enough force on a handgun to pull it from the holster. I try to stay out of our MRI suite, since I have three stainless steel pins in my left hip, from a femoral neck fracture I sustained several years ago in a bicycle crash. I assume that an active 5 Tesla field will not pull the pins right out of the bone, but I don't want to test that theory!

And let me tell you, the shielding that must surround the MRI suite is pretty pricy, too.
 

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Mill - to be honest, with field strengths like those things have - it makes me wonder just how well human tissue cells hold up!

How do teeth fillings manage too?
 

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Wow. That's gotta be the weirdest gun malfunction ever. :blink:

Personal electronics, metal implants in your body, credit cards, some types of watches and hearing aids all fare very poorly within the MRI magnetic field.
Now I'm having all sorts of nightmares about those rods fused to my spine. :dead:
 

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Stainless is relatively non-magnetic - at least compared with std steel.
Most guns are made from 410 or 416stainless steel which has enough carbon in it that it can be hardened...thus it can be very magnetic. The 300 series that is the most highly resisitant to corrosion are non-magnetic .

Even the stainless guns can be magnetized to a certain extent.
 

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Thx HG - my metallurgy is very rusty (oops, pun!). :wink:

Just reflecting too on the old speedo design - aluminum plate, ''slipped'' into rotation by magnet. Non magnetic material but affected - similar principle is it not, in electric meter.
 

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Purportedly, early MRI pioneers discovered the then-obscure art of genital piercing the hard way.

Ouch.

Matt
 

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For lack of a better term, what are the "magnetic properties" of titanium? If you had a titanium firing pin, could that reduce or negate that possibility of the pin getting "stuck" in the channel?
 

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Betty said:
Now I'm having all sorts of nightmares about those rods fused to my spine. :dead:
Seriously, if you ever have a MRI, be sure to tell them about any metal implants in your body.

And here is an old radiology joke regarding CT (computed tomography) and MRI (magnetic resonance imaging) scans:

What does CT stand for? Continue Testing

What does MRI stand for? More Radiologist Income

My secret fantasy wife for retirement is to find a 40 year old red-headed radiologist, preferably female. As is common for diagnostic radiologists, she would work pretty regular business hours, especially for a physician, and will make in the low six figures per year.

Odd how Mrs. MillCreek is not very supportive of my dreams.
 

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That's an amazing article, and I'd have never thought about the gun being magnitized that way!!
 

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Betty said:
Now I'm having all sorts of nightmares about those rods fused to my spine. :dead:
My orthopedic surgeon used S30V rods for my L4-L5 fusion (being a knife nut, I had to ask what steel he was using LOL), he said no MRIs until they came out. Had the rods removed after 18 months so no problem now - other than they have to use contrast to see through the graft. OTOH, my wife's surgeon used a Ti plate for her C6-C7 fusion and she's had no problems with MRIs.
Jack
 
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