xray sensitive materials

R

recoder

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
 
recoder <kurtulmehtap@gmail.com> wrote in news:73d22242-0998-4c7a-a78c-
2bee2cbda27c@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
Click to expand...
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.
 
Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9C44895AD5433zoodlewurdle@216.196.109.145:

and it as a photodiode
Click to expand...
and WIRE it as a photodiode...
 
On Fri, 10 Jul 2009 04:43:03 -0700 (PDT), recoder <kurtulmehtap@gmail.com> wrote:

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
Click to expand...
The usual method is a scintillator plus a photodiode.
You can probably find suitable materials inside an X-ray film cassette
 
Mike Harrison <mike@whitewing.co.uk> wrote in
news:a8ee55pqsp9jb3rtchjvh5j9ngm6gmegvp@4ax.com:

The usual method is a scintillator plus a photodiode.
You can probably find suitable materials inside an X-ray film cassette
Click to expand...
White LED phospors no good? I looked up scintillator because that's what I
had in mind too, and Googling returned a result that implied that
scintillation is basically fluorescense.

If it works a white LED ought to be a neat idea because it's very self-
contained, cheap, small...
 
On 10 Temmuz, 15:30, Lostgallifreyan <no-...@nowhere.net> wrote:
recoder <kurtulmeh...@gmail.com> wrote in news:73d22242-0998-4c7a-a78c-
2bee2cbda...@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.
Click to expand...
Just temporary,it has to return to its original state after exposure
 
recoder wrote:
On 10 Temmuz, 15:30, Lostgallifreyan <no-...@nowhere.net> wrote:
recoder <kurtulmeh...@gmail.com> wrote in
news:73d22242-0998-4c7a-a78c-
2bee2cbda...@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
Click to expand...
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.
 
"Bob Myers" <nospamplease@address.invalid> wrote in
news:h387c3$lk7$1@usenet01.boi.hp.com:

recoder wrote:
On 10 Temmuz, 15:30, Lostgallifreyan <no-...@nowhere.net> wrote:
recoder <kurtulmeh...@gmail.com> wrote in
news:73d22242-0998-4c7a-a78c-
2bee2cbda...@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.).
Click to expand...
"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.
 
On 10 Temmuz, 23:12, "Bob Myers" <nospample...@address.invalid> wrote:
recoder wrote:
On 10 Temmuz, 15:30, Lostgallifreyan <no-...@nowhere.net> wrote:
recoder <kurtulmeh...@gmail.com> wrote in
news:73d22242-0998-4c7a-a78c-
2bee2cbda...@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.- Alýntýyý gizle -

- Alýntýyý göster -
Click to expand...
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..
 
recoder wrote:

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.- Alýntýyý gizle -

- Alýntýyý 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..
Click to expand...
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.
 
On Fri, 10 Jul 2009 08:52:28 -0500, Lostgallifreyan
<no-one@nowhere.net> wrote:

Mike Harrison <mike@whitewing.co.uk> wrote in
news:a8ee55pqsp9jb3rtchjvh5j9ngm6gmegvp@4ax.com:

The usual method is a scintillator plus a photodiode.
You can probably find suitable materials inside an X-ray film cassette


White LED phospors no good? I looked up scintillator because that's what I
had in mind too, and Googling returned a result that implied that
scintillation is basically fluorescense.

If it works a white LED ought to be a neat idea because it's very self-
contained, cheap, small...
Click to expand...
Though it may work, it would not be very sensitive as the fluorescent
emissions may be mostly too long a wavelength for the LED to detect
when used as a photo diode.
 
"JosephKK"<quiettechblue@yahoo.com> wrote in
news:v42o75hmvh2mvg73hip416g052m1aph2kh@4ax.com:

On Fri, 10 Jul 2009 08:52:28 -0500, Lostgallifreyan
no-one@nowhere.net> wrote:

Mike Harrison <mike@whitewing.co.uk> wrote in
news:a8ee55pqsp9jb3rtchjvh5j9ngm6gmegvp@4ax.com:

The usual method is a scintillator plus a photodiode.
You can probably find suitable materials inside an X-ray film cassette


White LED phospors no good? I looked up scintillator because that's what
I
had in mind too, and Googling returned a result that implied that
scintillation is basically fluorescense.

If it works a white LED ought to be a neat idea because it's very self-
contained, cheap, small...

Though it may work, it would not be very sensitive as the fluorescent
emissions may be mostly too long a wavelength for the LED to detect
when used as a photo diode.
Click to expand...
Thanks. Didn't think anyone was going to answer that. :)

I remember taking apart a small radiation dosimeter.. had a small crystal in
it. I can't remember much about it but I think it was able to detect gamma
(case would have blocked both alpha and beta I think.) I wonder if those
might easily be made to detect X-rays. http://www.forces80.com/nbc.htm wrist
dosimeter, seen near end of page..
 
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