 |
|
| Science Forum Index » Materials Forum » xray sensitive materials... |
|
Page 1 of 1 |
|
| Author |
Message |
| recoder... |
 Posted: Fri Jul 10, 2009 1:43 am |
|
|
|
Guest
|
Dear All,
I have to find a material that changes its propoerty under XRAY
exposure.
Anything will do,
Resistance, Capacitance, density etc.
Please help,
Thanx in Advance |
|
|
| Back to top |
|
|
|
| recoder... |
| Posted: Fri Jul 10, 2009 3:18 am |
|
|
|
Guest
|
On 10 Temmuz, 15:30, Lostgallifreyan <no-... at (no spam) nowhere.net> wrote:
[quote:57d301d429]recoder <kurtulmeh... at (no spam) gmail.com> wrote in news:73d22242-0998-4c7a-a78c-
2bee2cbda... at (no spam) y7g2000yqa.googlegroups.com:
Dear All,
I have to find a material that changes its propoerty under XRAY
exposure.
Anything will do,
Resistance, Capacitance, density etc.
Please help,
Thanx in Advance
If you're ok with experimenting, try a white LED. LED's can be used as
photodiodes, and the phosphors in a white LED will probably fluoresce with x-
rays, so the emission might be detectable if you shroud the LED in darkness
and it as a photodiode.
If you want something more ideal, specify whether you want the change to be
temporary or permanent, as answers might vary hugely depending which you
want.
[/quote:57d301d429]
Just temporary,it has to return to its original state after exposure |
|
|
| Back to top |
|
|
|
| Lostgallifreyan... |
| Posted: Fri Jul 10, 2009 6:30 am |
|
|
|
Guest
|
recoder <kurtulmehtap at (no spam) gmail.com> wrote in news:73d22242-0998-4c7a-a78c-
2bee2cbda27c at (no spam) y7g2000yqa.googlegroups.com:
[quote:c4a0524212]Dear All,
I have to find a material that changes its propoerty under XRAY
exposure.
Anything will do,
Resistance, Capacitance, density etc.
Please help,
Thanx in Advance
[/quote:c4a0524212]
If you're ok with experimenting, try a white LED. LED's can be used as
photodiodes, and the phosphors in a white LED will probably fluoresce with x-
rays, so the emission might be detectable if you shroud the LED in darkness
and it as a photodiode.
If you want something more ideal, specify whether you want the change to be
temporary or permanent, as answers might vary hugely depending which you
want. |
|
|
| Back to top |
|
|
|
| Lostgallifreyan... |
| Posted: Fri Jul 10, 2009 6:31 am |
|
|
|
Guest
|
Lostgallifreyan <no-one at (no spam) nowhere.net> wrote in
news:Xns9C44895AD5433zoodlewurdle at (no spam) 216.196.109.145:
[quote:bf7010393f]and it as a photodiode
[/quote:bf7010393f]
and WIRE it as a photodiode... |
|
|
| Back to top |
|
|
|
| Bob Myers... |
| Posted: Fri Jul 10, 2009 2:12 pm |
|
|
|
Guest
|
recoder wrote:
[quote:200a21fe1e]On 10 Temmuz, 15:30, Lostgallifreyan <no-... at (no spam) nowhere.net> wrote:
recoder <kurtulmeh... at (no spam) gmail.com> wrote in
news:73d22242-0998-4c7a-a78c-
2bee2cbda... at (no spam) y7g2000yqa.googlegroups.com:
Dear All,
I have to find a material that changes its propoerty under XRAY
exposure.
Anything will do,
Resistance, Capacitance, density etc.
Please help,
Thanx in Advance
If you're ok with experimenting, try a white LED. LED's can be used
as photodiodes, and the phosphors in a white LED will probably
fluoresce with x- rays, so the emission might be detectable if you
shroud the LED in darkness and it as a photodiode.
If you want something more ideal, specify whether you want the
change to be temporary or permanent, as answers might vary hugely
depending which you want.
Just temporary,it has to return to its original state after exposure
[/quote:200a21fe1e]
More details on what you're trying to do would still be helpful - for
instance, what's stopping you from using a good ol' Geiger tube, or
a "scintillator" (generally a photomultiplier looking at a bit of sodium
iodide or some such)?
Also, how specific does it have to be to X-rays (as in, the idea of
watching for what happens with a white LED or some other phosphor-
bearing device is a good one, but it's also going to fluoresce when
exposed to UV, etc.).
Bob M. |
|
|
| Back to top |
|
|
|
| Lostgallifreyan... |
| Posted: Fri Jul 10, 2009 3:11 pm |
|
|
|
Guest
|
"Bob Myers" <nospamplease at (no spam) address.invalid> wrote in
news:h387c3$lk7$1 at (no spam) usenet01.boi.hp.com:
[quote:817835bee3]recoder wrote:
On 10 Temmuz, 15:30, Lostgallifreyan <no-... at (no spam) nowhere.net> wrote:
recoder <kurtulmeh... at (no spam) gmail.com> wrote in
news:73d22242-0998-4c7a-a78c-
2bee2cbda... at (no spam) y7g2000yqa.googlegroups.com:
Dear All,
I have to find a material that changes its propoerty under XRAY
exposure.
Anything will do,
Resistance, Capacitance, density etc.
Please help,
Thanx in Advance
If you're ok with experimenting, try a white LED. LED's can be used
as photodiodes, and the phosphors in a white LED will probably
fluoresce with x- rays, so the emission might be detectable if you
shroud the LED in darkness and it as a photodiode.
If you want something more ideal, specify whether you want the
change to be temporary or permanent, as answers might vary hugely
depending which you want.
Just temporary,it has to return to its original state after exposure
More details on what you're trying to do would still be helpful - for
instance, what's stopping you from using a good ol' Geiger tube, or
a "scintillator" (generally a photomultiplier looking at a bit of sodium
iodide or some such)?
Also, how specific does it have to be to X-rays (as in, the idea of
watching for what happens with a white LED or some other phosphor-
bearing device is a good one, but it's also going to fluoresce when
exposed to UV, etc.).
[/quote:817835bee3]
"shroud the LED in darkness"  Easy to do, many polymers are pretty much
transparent to x-rays but will totally exclude light including both far ends
of its spectrum, and it should help block electrons too, if you want to
check for gamma rays while excluding beta particles. I'm more curious about
whether the phosphors in the LED respond well to such shortwave emissions,
and whether the LED degrades fatally after limited x-ray exposure. I'm in no
position to test this so if anyone can supply answers, please do. |
|
|
| Back to top |
|
|
|
| recoder... |
| Posted: Sun Jul 12, 2009 11:18 pm |
|
|
|
Guest
|
On 10 Temmuz, 23:12, "Bob Myers" <nospample... at (no spam) address.invalid> wrote:
[quote:6ded22e649]recoder wrote:
On 10 Temmuz, 15:30, Lostgallifreyan <no-... at (no spam) nowhere.net> wrote:
recoder <kurtulmeh... at (no spam) gmail.com> wrote in
news:73d22242-0998-4c7a-a78c-
2bee2cbda... at (no spam) y7g2000yqa.googlegroups.com:
Dear All,
I have to find amaterialthat changes its propoerty underXRAY
exposure.
Anything will do,
Resistance, Capacitance, density etc.
Please help,
Thanx in Advance
If you're ok with experimenting, try a white LED. LED's can be used
as photodiodes, and the phosphors in a white LED will probably
fluoresce with x- rays, so the emission might be detectable if you
shroud the LED in darkness and it as a photodiode.
If you want something more ideal, specify whether you want the
change to be temporary or permanent, as answers might vary hugely
depending which you want.
Just temporary,it has to return to its original state after exposure
More details on what you're trying to do would still be helpful - for
instance, what's stopping you from using a good ol' Geiger tube, or
a "scintillator" (generally a photomultiplier looking at a bit of sodium
iodide or some such)?
Also, how specific does it have to be to X-rays (as in, the idea of
watching for what happens with a white LED or some other phosphor-
bearing device is a good one, but it's also going to fluoresce when
exposed to UV, etc.).
Bob M.- Alıntıyı gizle -
- Alıntıyı göster -
[/quote:6ded22e649]
So I see that we have only xray to light conversion and then measure
the light (like it is done in scintillators).
Interesting..I thought that there were materials that change its
resistance, capacitance etc. under exposure.. |
|
|
| Back to top |
|
|
|
| Bob Myers... |
| Posted: Mon Jul 13, 2009 4:17 pm |
|
|
|
Guest
|
recoder wrote:
[quote:9fc6115fa0]More details on what you're trying to do would still be helpful - for
instance, what's stopping you from using a good ol' Geiger tube, or
a "scintillator" (generally a photomultiplier looking at a bit of
sodium iodide or some such)?
Also, how specific does it have to be to X-rays (as in, the idea of
watching for what happens with a white LED or some other phosphor-
bearing device is a good one, but it's also going to fluoresce when
exposed to UV, etc.).
Bob M.- Alıntıyı gizle -
- Alıntıyı göster -
So I see that we have only xray to light conversion and then measure
the light (like it is done in scintillators).
Interesting..I thought that there were materials that change its
resistance, capacitance etc. under exposure..
[/quote:9fc6115fa0]
Note that I didn't say that X-ray -> light was the ONLY
possible form of X-ray detection/measurement - it's just
one of the more common. Off the top of my head, I am
not aware of materials that change resistance, etc., upon
exposure to X-rays, at least not in an especially useful
fashion, but I suppose that such might exist. Again, what's
really needed here is more info about what's really needed
here, and why the more usual methods already mentioned
can't be used.
Bob M. |
|
|
| Back to top |
|
|
|
|
|
All times are GMT - 5 Hours
The time now is Mon Nov 30, 2009 1:38 am
|
|