Four Techniques To E

Ver más

5c

por soha osman

Astronomical spectroscopy

por Wu Simon

Mindomo no. 1

por Diana Hussein

Investigating Paul Cezanne Painting

por Nourhan ElBery

Four Techniques To Examine A Painting

Fluorescene by short-wave and long-wave UV excitation from mercury lamp

Provides information from top 50 microns of painting's surface

By spectrometer, full emission collected from any area of painting

X-ray Fluorescene (XRF)

Can be detected for most metals and elements of atomic number 14 and larger

Atoms emmit x-ray frequencies when de-excited

Involves irradiating samples with x-rays to excite element's inner electrons

To examine the elemental composition from different colored areas

Ultraviolet (UV) Spectrum

This causes their absorption to decrease

polyene is oxidized over time

using polyene

Infrared Spectroscopy (IR)

It gives an indication that there maybe is an under drawing

It must be confirmed by another technique

It doesnot directly detect the presence of metal nuclei

To detect anomalies beneath paintings