Oldal 33 [33]
Figure 1-20. Visible induced luminescence images of a detail from a wall painting fragment from the
British Museum (Winged youth from the Tomb of the Nasonii, 1883,0505.5) acguired (a) with a
mixture of radiation from LEDS (R, G and B) and tungsten lamps, and (b) with radiation from LEDS
only.
Ambient stray radiation can arise from non-ideal working conditions such as a room where it
is not possible to exclude external radiation or in which there are luminescent objects. Whilst
some of these concerns can be addressed under controlled conditions or with nocturnal
image capture, it is often not possible to completely exclude ambient stray radiation in a
museum or gallery environment.
Figure 1-21. UV-induced luminescence images image of a detail from a wall painting fragment from
the British Museum (Winged youth from the Tomb of the Nasonii, 1883,0505.5) (a) with ambient stray
radiation and (b) in the absence of ambient stray radiation. The images are as shot.
Version No. 1.0 25 Date : 14/10/2013