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Gibbon · 70-79, M
@IHateViolence Actually Amazon sells a small sheet.
https://www.amazon.com/MuMETAL-Magnetic-Shielding-Thick-Sheet/dp/B017ABLYRO/ref=mp_s_a_1_1?dib=eyJ2IjoiMSJ9.e59VxqUKT4mFj2PDf59fSCpSxYdA-eg1cy_O-uQHNBLSn4RttQIOfV_jm9S3VXzeiNks7QfypV6mA0N5uY6RVtZzAJ7Av0TtGnWRdHlYuQNrmkbnCYopS3bYqJIJ3_B6cjKxeJbefZWx1B_SXX4DQo9tUnYPyvmOQbkyXd4e6oecLrxmuKESZ2oUBPhS7NmHph9k2D8kngNAcMcIK0Laig.XvWyV-_tkyS19EMwk_J_HgbE-4Eh2HU5bQ5Rd_8B9vQ&dib_tag=se&keywords=mu+metal+shielding&qid=1729296130&sr=8-1
It's expensive as you can see. I'm sure certain metal suppliers carry it. Our metal shop bought it in sheets. Can't even imagine the price. That was in the mid 70s and they formed into almost egg shape cans of various sizes that could be stacked tops and bottoms forming multiple layers which the sensors were placed inside shielding them from the outside world.
https://www.amazon.com/MuMETAL-Magnetic-Shielding-Thick-Sheet/dp/B017ABLYRO/ref=mp_s_a_1_1?dib=eyJ2IjoiMSJ9.e59VxqUKT4mFj2PDf59fSCpSxYdA-eg1cy_O-uQHNBLSn4RttQIOfV_jm9S3VXzeiNks7QfypV6mA0N5uY6RVtZzAJ7Av0TtGnWRdHlYuQNrmkbnCYopS3bYqJIJ3_B6cjKxeJbefZWx1B_SXX4DQo9tUnYPyvmOQbkyXd4e6oecLrxmuKESZ2oUBPhS7NmHph9k2D8kngNAcMcIK0Laig.XvWyV-_tkyS19EMwk_J_HgbE-4Eh2HU5bQ5Rd_8B9vQ&dib_tag=se&keywords=mu+metal+shielding&qid=1729296130&sr=8-1
It's expensive as you can see. I'm sure certain metal suppliers carry it. Our metal shop bought it in sheets. Can't even imagine the price. That was in the mid 70s and they formed into almost egg shape cans of various sizes that could be stacked tops and bottoms forming multiple layers which the sensors were placed inside shielding them from the outside world.
Gibbon · 70-79, M
@IHateViolence Yeah I figured that. But it's designed specifically for that which is why the expense.
ineedadrink · 51-55, M
ElwoodBlues · M
@ineedadrink Read what @ninalanyon posted - milli-gauss are a measure of magnetic field. See what they posted about your day to day exposure to the Earth's magnetic field.
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ninalanyon · 61-69, T
@ineedadrink Electromagnetic field is such a broad term as to be utterly meaningless unless qualified by units of some kind and the frequency of the field in question. Visible light is an electromagnetic field, so is the heat given off by a room heater and the radio waves that carry television and mobile phone signals. And so is the magnetic field of the closure that holds a mobile phone cover or a handbag closed.
The only hint we are given as to what he measured is the statement that he measured between 30 and 80 mG. I suppose that the meter uses mG to make the numbers look bigger because if you convert it to the international standard for magnetic flux density you get 8 uT (eight micro-Tesla). The Earth's magnetic field is about 50 uT.
The field inside an MRI scanner is typically about 1.5 T, nearly two hundred thousand time higher than the flux density measure in the car. Where does the idea that <5 mG is an acceptable level an, presumably, that higher levels are not come from?
The only hint we are given as to what he measured is the statement that he measured between 30 and 80 mG. I suppose that the meter uses mG to make the numbers look bigger because if you convert it to the international standard for magnetic flux density you get 8 uT (eight micro-Tesla). The Earth's magnetic field is about 50 uT.
The field inside an MRI scanner is typically about 1.5 T, nearly two hundred thousand time higher than the flux density measure in the car. Where does the idea that <5 mG is an acceptable level an, presumably, that higher levels are not come from?
Iwillwait · M
That's a bummer..