Mu-Metal.

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James Luck
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Mu-Metal.

Post by James Luck » 12 Jun 2020, 05:50

Hello everyone.

This us a question probably better suited for Steven or Luuk.
What's the most common thickness of Mu Metal used with scintillation detectors? Does the thickness change the overall characteristics of the alloy.
I know why it's used, but I'm yet to hear anyone ( or read ) if its thickness matters, such as any form of radiation I'd imagine the thicker the better.

-james
James luck
Chicago Ill, USA.
Hobbyist, primary meter: refurbished Eberline Esp-1.
Probe: 3 inch plastic scintillator kit from iradinc.

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Steven Sesselmann
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Re: Mu-Metal.

Post by Steven Sesselmann » 12 Jun 2020, 11:15

James,

Good question..

Frankly I have never read any studies on the effect of magnetic shielding. I have pulled apart many detectors and some have thicker 0.6-1.0 mm shielding and others have a thinner 0.1 mm.
I use Ultraperm 80 by 3M in my detectors, it's around 0.004" and wrap it around the PMT.

I suppose the shielding requirement will depend on the environment, remember some detectors might be used in laboratories with cyclotrons and huge magnetic fields, others might sit inside a 4" lead shield.

Steven

James Luck
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Joined: 10 Oct 2019, 04:16
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Re: Mu-Metal.

Post by James Luck » 12 Jun 2020, 12:59

Steven Sesselmann wrote:
12 Jun 2020, 11:15
James,

Good question..

Frankly I have never read any studies on the effect of magnetic shielding. I have pulled apart many detectors and some have thicker 0.6-1.0 mm shielding and others have a thinner 0.1 mm.
I use Ultraperm 80 by 3M in my detectors, it's around 0.004" and wrap it around the PMT.

I suppose the shielding requirement will depend on the environment, remember some detectors might be used in laboratories with cyclotrons and huge magnetic fields, others might sit inside a 4" lead shield.

Steven
Thank you Steven.
I figured what you said would be the case, I'll just wait for Luuk to answer when ever before I further my design for a scint.
Of course most of my work never enters much higher than industrial electronic pumps.
James luck
Chicago Ill, USA.
Hobbyist, primary meter: refurbished Eberline Esp-1.
Probe: 3 inch plastic scintillator kit from iradinc.

luuk
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Joined: 01 May 2015, 21:00
Location: the Netherlands
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Re: Mu-Metal.

Post by luuk » 13 Jun 2020, 05:01

Hi James,
Like Steven wrote most solid mu-shields are around 0.8mm, and the real thick ones are 1mm, I don’t think I have seen much thicker than around 1mm.
For standard use I would suggest 0.5-0.8mm that should be sufficient for a detector that is not used at a fixed place but you can “walk” around with it.
If you have a detector in a fixed position just some thin mu-foil direct wrapped around the pmt will do the trick.
Remember that around the cathode so the first few cm from cathode to the back of the pmt the most sensitive part is so there you must be a good shielding, at the end of the pmt the shielding is less important unless you work with a high magnetic field around the detector.
Luuk

James Luck
Posts: 29
Joined: 10 Oct 2019, 04:16
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Re: Mu-Metal.

Post by James Luck » 16 Jun 2020, 10:52

luuk wrote:
13 Jun 2020, 05:01
Hi James,
Like Steven wrote most solid mu-shields are around 0.8mm, and the real thick ones are 1mm, I don’t think I have seen much thicker than around 1mm.
For standard use I would suggest 0.5-0.8mm that should be sufficient for a detector that is not used at a fixed place but you can “walk” around with it.
If you have a detector in a fixed position just some thin mu-foil direct wrapped around the pmt will do the trick.
Remember that around the cathode so the first few cm from cathode to the back of the pmt the most sensitive part is so there you must be a good shielding, at the end of the pmt the shielding is less important unless you work with a high magnetic field around the detector.
Luuk
Thank you for the reply, Luuk.

Both you and steven was a great help on the question at hand.
James luck
Chicago Ill, USA.
Hobbyist, primary meter: refurbished Eberline Esp-1.
Probe: 3 inch plastic scintillator kit from iradinc.

luuk
Posts: 247
Joined: 01 May 2015, 21:00
Location: the Netherlands
Contact:

Re: Mu-Metal.

Post by luuk » 17 Jun 2020, 01:53

James,
if you need mu-metal I always have some used shield for a hobby price, if you are interested send me a pm with your needs.
Than I can look if I have something for you.
Luuk

James Luck
Posts: 29
Joined: 10 Oct 2019, 04:16
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Re: Mu-Metal.

Post by James Luck » 17 Jun 2020, 03:15

luuk wrote:
17 Jun 2020, 01:53
James,
if you need mu-metal I always have some used shield for a hobby price, if you are interested send me a pm with your needs.
Than I can look if I have something for you.
Luuk
Thank you Luuk, once I get time to sit down I'll see the size I'll need for the probe I'm thinking of building.
James luck
Chicago Ill, USA.
Hobbyist, primary meter: refurbished Eberline Esp-1.
Probe: 3 inch plastic scintillator kit from iradinc.

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