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Bi Ka1/Ka2 bifurcation
I had always wondered about the apparent bifurcation of the "Pb" peak around 75.? Based on the CdTe scans that George has done recently we now know that it is actually Bi Ka1/Ka2. The little bumps on the peak can be aligned precisely.? They show up early in the run so that the energy trimmer can be adjusted if necessary to account for temperature drift. Regarding the consistent Y/Nb bump on these scans it is still uncertain whether the Nb contribution is actually all or partially due to ThLb, even with the Si-PIN scans.? Oh well. Charles |
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Re: bassetite Si-PIN
Thanks, George.? Looks like there could be some Nb and Y but they are not very strong.? There are euxenite-Y and samarskite-Y reported from this locality so I guess it is not surprising to see traces of these elements. Charles On Wed, Dec 25, 2019 at 4:04 PM <GEOelectronics@...> wrote: Ok The previous file is the one for self excited, nothing there to see. This one should be the XRF is that the one you wanted? |
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Re: bassetite Si-PIN
checking... ----- Original Message ----- From: Charles David Young <charlesdavidyoung@...> To: [email protected] Sent: Wed, 25 Dec 2019 17:39:54 -0500 (EST) Subject: Re: [XRF] bassetite Si-PIN George I really don't see anything in this .mca.? The data is all 0's. Charles On Wed, Dec 25, 2019 at 12:51 PM <GEOelectronics@...> wrote: Yes did Am X8- .mca attached. |
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Re: bassetite Si-PIN
George I really don't see anything in this .mca.? The data is all 0's. Charles On Wed, Dec 25, 2019 at 12:51 PM <GEOelectronics@...> wrote: Yes did Am X8- .mca attached. |
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Re: Looking at Radium-226 from a rare perspective.
¿ªÔÆÌåÓýGeo, Using fewer channels will speed up the acquisition time but will reduce the resolution. This is a high resolution detector keep it above 2048. To get the best resolution for a low count rate source set the peaking time to a higher setting? 25 usec max. ?a short peaking time will introduce more noise into the system but will allow higher count rates. To minimize noise adjust the peaking time to its sweet spot. ?A peak time shorter or longer than that will increase the system noise and degrade resolution. Your peaking time of 1.6 is too short for what you are doing with low count rate sources.? The shaping time should also be set to accommodate the peaking time. For a general rule use 2.2 of the peaking time (peak time / 2.2 ).? To run these tests? set ?lower the LLD to where you have a lot of noise and it accommodates the low energy you want to see and adjust the peaking time and shaping time to find the low noise sweet spot.? A peltier cooler will only have a limited temperature it can cool to which depends on the heat load it¡¯s handling. To minimize the ?leakage current ?Johnson noise set it as low as possible They spec it at approximately -30 C (243 K). They also spec the HV at 500V don¡¯t go too high on this. Dud ? From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Wednesday, December 25, 2019 9:44 AM To: [email protected] Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. ? Posting this Ba-133 low energy scan here, before starting a
new topic for it. |
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Re: bassetite Si-PIN
Perhaps this is a job for Am241?? I think I saw it and didn't bother to create an image. If Am241 does not work I could send you a larger piece that I collected last Sat. El El mi¨¦, dic. 25, 2019 a la(s) 12:15 p.?m., <GEOelectronics@...> escribi¨®:
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Re: bassetite Si-PIN
Seems it was not radioactive enough for much to show, I did do XRF did you see that? ----- Original Message ----- From: Charles David Young <charlesdavidyoung@...> To: [email protected] Sent: Wed, 25 Dec 2019 07:49:14 -0500 (EST) Subject: [XRF] bassetite Si-PIN George, Merry Xmas! When you get a chance could you run the bassetite again with Si-PIN?? I would like to verify that Y peak and also the Fe content. Thanks Charles |
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Re: Looking at Radium-226 from a rare perspective.
Posting this Ba-133 low energy scan here, before starting a new topic for it.
The surprising thing is the source (10 uCi Ba-133)? to detector? distance and the input count rate. Pics + .mca? show. A fast 2 point calibration was done using the Ba-133 ~81 keV Gamma and the Cesium daughter Ka X-Ray. Maximizing lowest energy area requires, fewer channels, HV, TE temperature, HV, and peaking time fiddling. Shows promise.? |
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Re: Looking at Radium-226 from a rare perspective.
¿ªÔÆÌåÓýPost the Th ?file with the Ra Ll Dud ? From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Wednesday, December 25, 2019 9:13 AM To: [email protected] Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. ? .mca file for above (fingers crossed, was rejected last
time??) |
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Re: Looking at Radium-226 from a rare perspective.
.mca file for above (fingers crossed, was rejected last time??)
Note- placed the CdTe head into the rolled-sheet-metal shield, 1/2" Pb on outside followed by a layer of Cd, then 1/2" Cu on inside. After initial tests the detector parameters were adjusted for better results, still not finished with that but seemingly the lower threshold has been sustainable down to Fe K lines, That's good enough, but explore the best possible before going back to those settings.... Geo |
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Re: Looking at Radium-226 from a rare perspective.
¿ªÔÆÌåÓýI don¡¯t think you sent the new mca file showing the lower energies. Dud ? From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Tuesday, December 24, 2019 3:07 PM To: [email protected] Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. ? Yeah, my problem is I told the Greek instructor that I wanted to learn the Greek Alphabet from A to Z, so he did. I should have wondered how they could have been so smart with only 6 letters in their alphabet (Alpha thru Zeta). ? Bummer. ? By zooming in on the area of the peak in question, 5 individual peaks are revealed between 10 and 11 keV. One is very close to 10.662 (L3M1) ? Geo ? ? ? ? -----
Original Message ----- ?
Yes,
?Ll it¡¯s the M1 transition to L3. I don¡¯t have one of these ? ? From:
[email protected] ? is ? Geo ? ----- ?
"Ra Ll ? Which ? Geo ? ----- ? ? The Dud ? From: ? Here's a scan and picture of the plot with the enhanced ? ? ? ? ? ? ? ? ? ? ? ? ? |
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Re: Looking at Radium-226 from a rare perspective.
Had there been an updated .mca file? El El mar, dic. 24, 2019 a la(s) 5:06 p.?m., <GEOelectronics@...> escribi¨®:
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Re: Looking at Radium-226 from a rare perspective.
Yeah, my problem is I told the Greek instructor that I wanted to learn the Greek Alphabet from A to Z, so he did. I should have wondered how they could have been so smart with only 6 letters in their alphabet (Alpha thru Zeta). Bummer. By zooming in on the area of the peak in question, 5 individual peaks are revealed between 10 and 11 keV. One is very close to 10.662 (L3M1) Geo ----- Original Message ----- From: Dude <dfemer@...> To: [email protected] Sent: Tue, 24 Dec 2019 17:36:20 -0500 (EST) Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. Yes, ?Ll it¡¯s the M1 transition to L3. I don¡¯t have one of these ? ? From: [email protected] ? is ? Geo ? ----- ?
"Ra Ll ? Which ? Geo ? ----- ? ? The Dud ? From: ? Here's a scan and picture of the plot with the enhanced ? ? ? ? ? ? ? ? |
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Re: Looking at Radium-226 from a rare perspective.
¿ªÔÆÌåÓýYes, ?Ll it¡¯s the M1 transition to L3. I don¡¯t have one of these fancy greek swiggle things so I call it an l ? ? From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Tuesday, December 24, 2019 1:35 PM To: [email protected] Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. ? is that the L3M1 transition? ? Geo ? -----
Original Message ----- ?
"Ra Ll line" ? Which line is it? L what? ? Geo ? -----
Original Message ----- ? ? The
¡°Pb xray¡±at 10.55 keV is actually the Ra Ll line. You now Dud ? From:
[email protected] ? Here's a scan and picture of the plot with the enhanced ? ? ? ? ? ? ? ? |
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Re: Looking at Radium-226 from a rare perspective.
is that the L3M1 transition? Geo ----- Original Message ----- From: GEOelectronics@... To: [email protected] Sent: Tue, 24 Dec 2019 16:17:02 -0500 (EST) Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. "Ra Ll line" Which line is it? L what? Geo ----- Original Message ----- From: Dude <dfemer@...> To: [email protected] Sent: Tue, 24 Dec 2019 15:37:21 -0500 (EST) Subject: Re: [XRF] Looking at Radium-226 from a rare perspective. The ¡°Pb xray¡±at 10.55 keV is actually the Ra Ll line. You now Dud ? From: [email protected] ? Here's a scan and picture of the plot with the enhanced |
