charles:?
thank you for the quick reply.
?
I stumbled across a portable dental xray unit ad on feebay for
$690
TECHNICAL SPECIFICATIONS：
1.???Tube voltage：60KV
2.???Tube current：2mA
3.???Exposure time：0.1-2.0S
4.???贵谤别辩耻别苍肠测：30办贬锄
5.???Rate power：120VA
6.???Distance from skin to cone：105mm
7.???Tube focus：0.8mmx0.8mm
8.???Battery：DC14.8V 1600mAh
?
I guess the exposure range is too short.
Oh well. Just curious. I need to make more space in my room!
P
|
I use 50kV, 1.6uA, and perhaps 30 seconds of exposure.? However, it very much depends on your setup and what elements you are looking for.
Charles
hi:
?I was curious as to what are typical xray requirements:
?
Roughly
? ? ? ? ? ?what kV
? ? ? ? ? ? ?x.xx mA
? ? ? ? ? y.yy seconds of xray exposure
?
is needed for a typical xrf measurement ?
?
p
?
|
hi:
?I was curious as to what are typical xray requirements:
?
Roughly
? ? ? ? ? ?what kV
? ? ? ? ? ? ?x.xx mA
? ? ? ? ? y.yy seconds of xray exposure
?
is needed for a typical xrf measurement ?
?
p
?
|
Re: Nickel in Indochinite Tektites, from here or there?
Taray,
The binding energy of Rh
is 23 keV so anything below that will eliminate the K’s. The x-ray brem will
start at that voltage and peak about a third or so down.
Dud
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of taray singh via groups.io
Sent: Saturday, August 17, 2024
8:09 PM
To: [email protected]
Subject: Re: [XRF-Page-2] Nickel
in Indochinite Tektites, from here or there?
?
There is small labeling?mistake in my
tektites and tellurium thermimo xray exciter pic which??I
overlooked.
Red??is??my big tektite
Green Mike’s tektite with Rh characteristic hump?
Blue tellurium metal?
?
?
On Sunday,
August 18, 2024, 8:14 AM, taray singh via groups.io
<sukhjez@...> wrote:
Mike
Good
input on the scatter study
Well
it appears that scattering can accentuate??minor peaks in
bg??from
outside and within the detector?
Will
wait for reply from Amptek
Like
to know the purity nature of silicon in si-pin detector
BTW
just??thinking
what??KV
just below??the critical voltage
of rhodium anode to??knock off Rh
interference in your tektite spectrum?
It
will??eliminate
the hump below Ba??to large extent?
Thanks
?
?
On Saturday, August 17, 2024, 11:16 PM, Mike L.
<loughlin3@...> wrote:
As mentioned in my original
post,?? I experimented with various samples using an Am241 exciter to
study Compton and Raleigh (coherent) backscatter.? The samples were
aluminum, copper, and water.? All three showed something near the Te K
line at about 27.5 keV.? lt did not appear to vary with the samples at
all.? Looking at my results, I think that the big increase in reflected,
coherent scatter due to low Z occurs below about 25 keV.?? If you
really want to see what the system interference (below 25 keV) is coming from
your source, direct it into a distilled water sample.?
My Aluminum sample was a 6061
alloy, which is pretty clean, metallurgically.? Copper was the only
alloying element I saw.
I think you are on the right
track regarding Te.
|
Re: Nickel in Indochinite Tektites, from here or there?
There is small labeling?mistake in my tektites and tellurium thermimo xray exciter pic which??I overlooked. Red??is??my big tektite Green Mike’s tektite with Rh characteristic hump? Blue tellurium metal?
On Sunday, August 18, 2024, 8:14 AM, taray singh via groups.io <sukhjez@...> wrote:
Mike Good input on the scatter study Well it appears that scattering can accentuate??minor peaks in bg??from outside and within the detector? Will wait for reply from Amptek Like to know the purity nature of silicon in si-pin detector BTW just??thinking what??KV just below??the critical voltage of rhodium anode to??knock off Rh interference in your tektite spectrum? It will??eliminate the hump below Ba??to large extent? Thanks
On Saturday, August 17, 2024, 11:16 PM, Mike L. <loughlin3@...> wrote: Taray,
?
As mentioned in my original post,?? I experimented with various samples using an Am241 exciter to study Compton and Raleigh (coherent) backscatter.? The samples were aluminum, copper, and water.? All three showed something near the Te K line at about 27.5 keV.? lt did not appear to vary with the samples at all.? Looking at my results, I think that the big increase in reflected, coherent scatter due to low Z occurs below about 25 keV.?? If you really want to see what the system interference (below 25 keV) is coming from your source, direct it into a distilled water sample.?
?
My Aluminum sample was a 6061 alloy, which is pretty clean, metallurgically.? Copper was the only alloying element I saw.
?
I think you are on the right track regarding Te.
?
?
?
?
?
?
|
Re: Nickel in Indochinite Tektites, from here or there?
Mike Good input on the scatter study Well it appears that scattering can accentuate??minor peaks in bg??from outside and within the detector? Will wait for reply from Amptek Like to know the purity nature of silicon in si-pin detector BTW just??thinking what??KV just below??the critical voltage of rhodium anode to??knock off Rh interference in your tektite spectrum? It will??eliminate the hump below Ba??to large extent? Thanks
On Saturday, August 17, 2024, 11:16 PM, Mike L. <loughlin3@...> wrote: Taray,
?
As mentioned in my original post,?? I experimented with various samples using an Am241 exciter to study Compton and Raleigh (coherent) backscatter.? The samples were aluminum, copper, and water.? All three showed something near the Te K line at about 27.5 keV.? lt did not appear to vary with the samples at all.? Looking at my results, I think that the big increase in reflected, coherent scatter due to low Z occurs below about 25 keV.?? If you really want to see what the system interference (below 25 keV) is coming from your source, direct it into a distilled water sample.?
?
My Aluminum sample was a 6061 alloy, which is pretty clean, metallurgically.? Copper was the only alloying element I saw.
?
I think you are on the right track regarding Te.
?
?
?
?
?
?
|
Re: Nickel in Indochinite Tektites, from here or there?
Taray,
?
As mentioned in my original post,?? I experimented with various samples using an Am241 exciter to study Compton and Raleigh (coherent) backscatter.? The samples were aluminum, copper, and water.? All three showed something near the Te K line at about 27.5 keV.? lt did not appear to vary with the samples at all.? Looking at my results, I think that the big increase in reflected, coherent scatter due to low Z occurs below about 25 keV.?? If you really want to see what the system interference (below 25 keV) is coming from your source, direct it into a distilled water sample.?
?
My Aluminum sample was a 6061 alloy, which is pretty clean, metallurgically.? Copper was the only alloying element I saw.
?
I think you are on the right track regarding Te.
?
?
?
?
?
?
|
Re: Nickel in Indochinite Tektites, from here or there?
Taray,
?
Yes, I was aware characteristic x-rays are not required.? You often see florescence in Gamma Spectroscopy.? My very first xrf experiment was with a NaI probe, Silver Coin, and a Radium watch hand.? It worked (but not very well).? Radium has a very messy spectrum.?
?
I just did not recognize that hump in the X-ray scans as bremsstrahlung.? It is not seen in my Am241 spectrums.
?
I did not know how much more energetic excitation needs to be to see characteristic K lines of the target. Thanks.
?
Mike
?
?
|
Re: Nickel in Indochinite Tektites, from here or there?
Check out this free ?article Tellurium Contamination in Silicon Looks like small amounts could be present in si- pin detectors
On Saturday, August 17, 2024, 11:45 AM, taray singh via groups.io <sukhjez@...> wrote:
Since present in both xray and buttons points to si-pin detector as possible source? Seen??more when scattering from low??Z sample interactions??with detector.
Te is sometimes added to si-pin detectors for performance enhancement? One way to find out Will ask Amptek?
On Saturday, August 17, 2024, 11:21 AM, taray singh via groups.io <sukhjez@...> wrote: I managed to find my old Te metal and Al mca files to make a comparison.
Te like peaks are seen in Al with xray and Am241 exciter
More obvious when florescent? yield is low and higher scatter
If look at my tektitebigscatter mca with my detector/sample not well aligned systemic peaks like Sn and Te are more visible? due to scattering.
There is Sn in my? my graded shielding .
It is possible this Te peak is a manisfestation of a systemic peak?
The question is the source?
Anyway if traces of? Te can form in tektites,geologist will not be having a? hard time locating the impact zone
|
Re: Nickel in Indochinite Tektites, from here or there?
Since present in both xray and buttons points to si-pin detector as possible source? Seen??more when scattering from low??Z sample interactions??with detector.
Te is sometimes added to si-pin detectors for performance enhancement? One way to find out Will ask Amptek?
On Saturday, August 17, 2024, 11:21 AM, taray singh via groups.io <sukhjez@...> wrote: I managed to find my old Te metal and Al mca files to make a comparison.
Te like peaks are seen in Al with xray and Am241 exciter
More obvious when florescent? yield is low and higher scatter
If look at my tektitebigscatter mca with my detector/sample not well aligned systemic peaks like Sn and Te are more visible? due to scattering.
There is Sn in my? my graded shielding .
It is possible this Te peak is a manisfestation of a systemic peak?
The question is the source?
Anyway if traces of? Te can form in tektites,geologist will not be having a? hard time locating the impact zone
|
Re: Nickel in Indochinite Tektites, from here or there?
I managed to find my old Te metal and Al mca files to make a comparison.
Te like peaks are seen in Al with xray and Am241 exciter
More obvious when florescent? yield is low and higher scatter
If look at my tektitebigscatter mca with my detector/sample not well aligned systemic peaks like Sn and Te are more visible? due to scattering.
There is Sn in my? my graded shielding .
It is possible this Te peak is a manisfestation of a systemic peak?
The question is the source?
Anyway if traces of? Te can form in tektites,geologist will not be having a? hard time locating the impact zone
|
No detailed chemical analysis? I requested for it? It is proprietary information
On Thursday, August 15, 2024, 11:01 PM, Dude <dfemer@...> wrote:
Good job
Dud
?
?
The drug company replied
After a constant
barrage of questions ranging from physics ,chemistry and nuclear science they? finally did some
analysis
All impurities are
within recommendation limits
I accepted their
answer
But advised them to
use more “ friendly “ ampoules for certain drugs? in future.
Case closed
Have xrf will travel
|
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of taray singh via groups.io
Sent: Thursday, August 15, 2024
12:20 AM
To: [email protected]
Subject: Re: [XRF-Page-2] medical
ampoule
?
The drug company replied
After a constant
barrage of questions ranging from physics ,chemistry and nuclear science they? finally did some
analysis
All impurities are
within recommendation limits
I accepted their
answer
But advised them to
use more “ friendly “ ampoules for certain drugs? in future.
Case closed
Have xrf will travel
|
The drug company replied
After a constant barrage of questions ranging from physics ,chemistry and nuclear science they? finally did some analysis
All impurities are within recommendation limits
I accepted their answer
But advised them to use more “ friendly “ ampoules for certain drugs? in future.
Case closed
Have xrf will travel
|
Re: Nickel in Indochinite Tektites, from here or there?
Mike In case you are??wondering,there is no absolute necessity to have characteristics x-rays for flourescent yield The cumulative effect of the??strong Bremsstrahlung??continuum together with peak height??position is sufficient??for xrf My W anode x-ray at 60 KV is not producting charactestic K line photons despite K line near 60 KV?
Characteristic K-line photons are not produced by X-ray tubes with tungsten targets operating at less than 69.5 kV – referred to as the critical voltage.
On Thursday, August 15, 2024, 7:39 AM, Mike L. <loughlin3@...> wrote: Dud,
?
Thanks for the detailed explanation.
?
Mike L.
|
Re: Nickel in Indochinite Tektites, from here or there?
Dud,
?
Thanks for the detailed explanation.
?
Mike L.
|
Re: Nickel in Indochinite Tektites, from here or there?
Mike,
The Rh K lines are at
20keV and sit on the Bremsstrahlung (Compton) continuum which is generated from
the electron beam breaking energy which produces X-ray’s off the anode. It is ?dependent on the X-ray tube voltage. You
adjust the tube voltage for the range of elements you are looking for. 40 kV is
good for Mg up to Ba or so. For rare earth elements 50 or 60 kV gets their K‘s.
For the light elements use a 15 or 20 kV setting. Filters can be used to minimize
the Compton above the K edge of interest. The Brem can mask weak peaks (S/N) so
use a voltage setting that is appropriate for L’s and K’s you are looking for.
Bigger is not always better.
?
Dud KK7IF
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Mike L.
Sent: Wednesday, August 14, 2024
8:01 AM
To: [email protected]
Subject: Re: [XRF-Page-2] Nickel
in Indochinite Tektites, from here or there?
?
This may be a stupid question.? If Rh is the anode
(target?)?? why are there so many counts above the Rh Ka1 line?
|
Re: Nickel in Indochinite Tektites, from here or there?
Taray,
I’m going to hit the
rock shop and pick up a tektite and see what I get.? Te just doesn’t show up that often so I’m
curious and a Rb Sr sum peak doesn’t quite fit either.
Dud
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of taray singh via groups.io
Sent: Wednesday, August 14, 2024
1:44 AM
To: [email protected]
Subject: Re: [XRF-Page-2] Nickel
in Indochinite Tektites, from here or there?
?
Readjusted setup? with better results
My tektites with a different shape and size share similar xrf
characteristics
Both are from the same strewnfield.
Te does not? seem to fit in despite going? on log scale
Pic comparing my 2 tektites and my big tektite mca repeated
|
Re: Nickel in Indochinite Tektites, from here or there?
Dud,
?
This may be a stupid question.? If Rh is the anode (target?)?? why are there so many counts above the Rh Ka1 line?
?
Mike L.
|
Re: Nickel in Indochinite Tektites, from here or there?
Very nice work!? There does seem to be some variation in all of these with regard to the Fe/Ni ratios, which I find interesting.?? Any idea why Rb,Sr, and Zr lines appear?? I am traveling now, but I will calculate the count ratios for Fe/Ni between our Samples soon.
?
?
|
Mike L.
