Nothing that I know of. Even x-ray mirrors can only work at low incidence angles. Some kinds of crystals can produce a diffraction pattern but I don't think it is very useful for detetmining wavelength. A very low resolution method which is used is to have filters made of different thicknesses of various shielding materials and put them successively in front of the sensor. They also do sometimes use arrays of PMTs or APDs which are fast enough that they can resolve each scintillation pulse and provide spectral information (see gamma camera) but the spatial resolution is poor and they are expensive and fairly large. On Mar 27, 2018 5:23 PM, "Van Horn, David" < david.vanhorn@backcountryaccess.com> wrote: > I wonder what makes a good prism at these wavelengths? > > -----Original Message----- > From: piclist-bounces@mit.edu On Behalf Of Sean > Breheny > Sent: Tuesday, March 27, 2018 2:44 PM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Dental xray sensors > > Energy spectrum is a tougher requirement. You need a scintillator materia= l > which has a high energy resolution (they tend to blur different input > photons into closer-wavelength visible light photons unless they are a > special kind) You also need a detector which can measure the brightness o= f > each photon, even when multiple photos hit the same pixel with very littl= e > separation. For the most part imaging and gamma spectroscopy do not coexi= st > in the same instrument, > > On Tue, Mar 27, 2018 at 4:38 PM, Van Horn, David < david.vanhorn@ > backcountryaccess.com> wrote: > > > I've been looking for a way to definitively detect xrays as opposed to > > other radiation, and to get an energy spectrum from a given source. > > Typically, I'm looking at Bremsstrahlung emissions from about 60kEV on > > down. > > > > > > -----Original Message----- > > From: piclist-bounces@mit.edu On Behalf Of > > Allen Mulvey > > Sent: Tuesday, March 27, 2018 2:23 PM > > To: 'Microcontroller discussion list - Public.' > > Subject: RE: [EE] Dental xray sensors > > > > Not long ago my dentist sent me to a specialist for a root canal. He > > used one of these and it was really cool. Within seconds, my teeth > > were a foot and a half tall on the big screen on the wall. It was so > > big and clear even I could see exactly what they were talking about. > > > > Allen > > > > -----Original Message----- > > From: piclist-bounces@mit.edu > > [mailto:piclist-bounces@mit.edu] On Behalf Of Van Horn, David > > Sent: Tuesday, March 27, 2018 10:47 AM > > To: Microcontroller discussion list - Public. > > Subject: [EE] Dental xray sensors > > > > Apparently, there are now xray imaging sensors that are replacing film. > > Does anyone here have details on how they work? USB plug with a > > little paddle which apparently has a high rez image sensor and USB > interface. > > I looked on Ebay and they are rather pricey even in "broken for parts > > only" state. I'd be very curious to get one and see what interesting > > things can be done with it. > > > > > > -- > > David VanHorn > > Lead Hardware Engineer > > > > Backcountry Access, Inc. > > 2820 Wilderness Pl, Unit H > > Boulder, CO 80301 USA > > phone: 303-417-1345 x110 > > email: > > david.vanhorn@backcountryaccess.com > kcountryaccess.com> > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at http://mailman.mit.edu/ > > mailman/listinfo/piclist > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at http://mailman.mit.edu/ > > mailman/listinfo/piclist > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at http://mailman.mit.edu/ > mailman/listinfo/piclist > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .