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Instrumentation - making & detecting x-rays Read Roe - Chap 2 through 2.5.1 (ignore neutrons)

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Presentation on theme: "Instrumentation - making & detecting x-rays Read Roe - Chap 2 through 2.5.1 (ignore neutrons)"— Presentation transcript:

1 Instrumentation - making & detecting x-rays Read Roe - Chap 2 through 2.5.1 (ignore neutrons)

2 Instrumentation - making x-rays 'Laboratory’ x-ray tubes - rotating anodes Same mechanism for x-ray production - different anode setup

3 Instrumentation - making x-rays 'Laboratory’ x-ray tubes - rotating anodes Same mechanism for x-ray production - different anode setup Focal spot spread out over cylinder surface Tube power up to 20X that of Coolidge tube

4 Instrumentation - making x-rays Synchrotron Electrons or positrons injected into ring

5 Instrumentation - making x-rays Synchrotron Electrons or positrons injected into ring Where charged particle stream is bent, x-rays are emitted

6 Instrumentation - making x-rays Synchrotron Electrons or positrons injected into ring Where charged particle stream is bent, x-rays are emitted X-ray beam: extremely bright very tiny low divergence - < milliradian in ring plane

7 Instrumentation - making x-rays Synchrotron Electrons or positrons injected into ring Where charged particle stream is bent, x-rays are emitted X-ray beam: extremely bright very tiny low divergence - < milliradian broad spectrum in ring plane

8 Instrumentation - making x-rays Synchrotron Electrons or positrons injected into ring Where charged particle stream is bent, x-rays are emitted X-ray beam: extremely bright very tiny low divergence - < milliradian broad spectrum in ring plane Can choose any in 0.1-10 Å using incident beam monochromator Monochromator often focusing type

9 Instrumentation - making x-rays Synchrotron Electrons or positrons injected into ring Where charged particle stream is bent, x-rays are emitted X-ray beam: extremely bright very tiny low divergence - < milliradian broad spectrum in ring plane Can choose any in 0.1-10 Å using incident beam monochromator Monochromator often focusing type Can tune for absorption by specific atoms in specimen

10 Instrumentation - making x-rays Synchrotron

11 Instrumentation - making x-rays Synchrotron

12 Instrumentation - making x-rays Synchrotron

13 Instrumentation - x-ray detectors Point - requires scan Scintillation counter x-rays converted to light

14 Instrumentation - x-ray detectors Point - requires scan Scintillation counter x-rays converted to light Solid state (SiLi) detector x-rays ––> electron- hole pairs

15 Instrumentation - x-ray detectors Point - requires scan Scintillation counter x-rays converted to light Solid state (SiLi) detector x-rays ––> electron- hole pairs very high resolution very low noise dead time problem liq N 2 temp required

16 Instrumentation - x-ray detectors Linear - may require scan, depending on instrument

17 Instrumentation - x-ray detectors Area Film - old technology still used, especially Polaroid

18 Instrumentation - x-ray detectors Area Film - old technology still used, especially Polaroid CCD

19 Instrumentation - x-ray detectors Area Film - old technology still used, especially Polaroid CCD Multiwire

20 Instrumentation - x-ray detectors Area Film - old technology still used, especially Polaroid CCD Multiwire Image ‘plates’ (BaBrF:Eu +2 )

21 Instrumentation - x-ray detectors Area Film - old technology still used, especially Polaroid CCD Multiwire Image ‘plates’ (BaBrF:Eu +2 )

22 Instrumentation - x-ray detectors Area Film - old technology still used, especially Polaroid CCD Multiwire Image ‘plates’ (BaBrF:Eu +2 )


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