Manganese 54 Gamma Spectrum

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isoenzyme
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Manganese 54 Gamma Spectrum

Post by isoenzyme » 30 Apr 2019, 15:52

Manganese-54 (Mn-54) is traditionally a beta source with a half-life of 312.2 days that decays via electron capture to Cr-54. It emits a beta particle at 542.2 keV but also a single gamma at 834.8 keV (and 14 X-rays centered around 0.5 and 5 keV). Using a CsI(Tl) detector with the GS-USB-PRO results in the following spectrum:
1 uCi Mn-54.png
Gamma spectrum of 1 uCi Mn-54 showing the single gamma emission at 834.8 keV.
1 uCi Mn-54.png (45.58 KiB) Viewed 696 times
A screen capture of the PRA height histogram is also provided:
2019-04-28 Mn-54.png
PRA (v.20) height histogram of Mn-54.
Christopher Lloyd
Salt Lake City, Utah (US)


Setup: Modified GS-STANDUP-20 with GS-USB-PRO
Primary Detector: GS 2" x 2" CsI(Tl)

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Steven Sesselmann
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Re: Manganese 54 Gamma Spectrum

Post by Steven Sesselmann » 01 May 2019, 09:11

Christopher,

Nice contribution, first time here. With your permission I shall add it to the sample spectra on my site.

Steven
mn.png
Manganese 54 - Mn54
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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isoenzyme
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Location: Utah (USA)
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Re: Manganese 54 Gamma Spectrum

Post by isoenzyme » 01 May 2019, 09:14

I would be honored if you did - the table is an excellent addition.
Christopher Lloyd
Salt Lake City, Utah (US)


Setup: Modified GS-STANDUP-20 with GS-USB-PRO
Primary Detector: GS 2" x 2" CsI(Tl)

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Steven Sesselmann
Posts: 624
Joined: 27 Apr 2015, 11:40
Location: Sydney
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Re: Manganese 54 Gamma Spectrum

Post by Steven Sesselmann » 02 May 2019, 13:21

Thanks Christopher,

These gamma spectrum samples bring a lot of new people to my site, so I try to make them as informative as possible.

I did a bit of searching and found some info, but if you have anything to add to Mn54 or any of the other spectra, I am happy to do so.

https://www.gammaspectacular.com/blue/g ... a_Spectrum

Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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isoenzyme
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Re: Manganese 54 Gamma Spectrum

Post by isoenzyme » 02 May 2019, 13:45

Thanks for adding it to the spectrum database. Looks great! I've got a Zn-65 spectrum to add as soon as I find out where a mystery peak is coming from...
Christopher Lloyd
Salt Lake City, Utah (US)


Setup: Modified GS-STANDUP-20 with GS-USB-PRO
Primary Detector: GS 2" x 2" CsI(Tl)

Conor Whyte
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Re: Manganese 54 Gamma Spectrum

Post by Conor Whyte » 09 May 2019, 14:32

Here is what Mn54 looks like on my setup using Theremino MCA 7.3 . Not quite as clean.




Image
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ThereminoMCA_2019_05_08_21_10_13.png
ThereminoMCA_2019_05_08_21_10_13.png (60.22 KiB) Viewed 638 times

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isoenzyme
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Re: Manganese 54 Gamma Spectrum

Post by isoenzyme » 09 May 2019, 15:52

Wow, for a 10 uCi source that looks super clean. How would it look if you "turned up the volume" just a bit (i.e., until the Audio Input bar was at 75%-90%)?
Christopher Lloyd
Salt Lake City, Utah (US)


Setup: Modified GS-STANDUP-20 with GS-USB-PRO
Primary Detector: GS 2" x 2" CsI(Tl)

Conor Whyte
Posts: 46
Joined: 28 Apr 2019, 15:06
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Re: Manganese 54 Gamma Spectrum

Post by Conor Whyte » 10 May 2019, 03:19

I am going to experiment a bit more with the Theremino MCA software. That's only very short exposure. I am going to experiment with a longer exposure and use PRA to see if I can get a better resolution. The peak at the left side is not visible so more experimentation is needed

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isoenzyme
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Re: Manganese 54 Gamma Spectrum

Post by isoenzyme » 10 May 2019, 04:41

Best of luck. The audio input signal is so low I'm wondering if you're saturating (an easy thing to do with such a hot source). I'd play with the volume from (I think) the options tab on the Theremino software: If the signal INCREASES when you turn the volume down then saturation is possible. (I downloaded and have tried the Theremino software for this very purpose - it's a bit easier to do this function vs. PRA. I use the GS-USB-PRO and have taken to using the Theremino output to adjust the volume - I wish PRA had that function ... or I wish I knew how to use PRA to accomplish that function) Be warned that adjusting the volume will mess with your calibration.
Christopher Lloyd
Salt Lake City, Utah (US)


Setup: Modified GS-STANDUP-20 with GS-USB-PRO
Primary Detector: GS 2" x 2" CsI(Tl)

Conor Whyte
Posts: 46
Joined: 28 Apr 2019, 15:06
Contact:

Re: Manganese 54 Gamma Spectrum

Post by Conor Whyte » 11 May 2019, 11:08

Here is what happened in Theremino MCA 7.3 last night after backing the source off to 1.5m distance.




Image

Image
Mn54.png
Mn54.png (93.77 KiB) Viewed 608 times
Attachments
ThereminoMCA_2019_05_08_21_22_31.png
ThereminoMCA_2019_05_08_21_22_31.png (88.91 KiB) Viewed 608 times

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