Specifications

19
Special Applications
F8
High speed, high contrast ne grain lm, for exposures in combination with RCF
uorometallic screens or uorescent screens.
• High system speed is main requirement
• On stream corrosion/erosion
radiography
• Concrete and heavy constructions
• Low dosage output, e.g. microfocus
Structurix F8
Designed as a high quality lm for
uorometallic (RCF) screen exposure when
the speed obtainable with Pb screen
system is insufcient or radiation safety is
of prime importance.
Sensitive to all UV and blue-emitting
screens. Calcium tungstate with lead or
lead oxide backing, so called
uorometallic screens (Structurix RCF
Screens), are most suited for industrial
applications.
F8 with uorescent screens is used in a
variety of heavy construction applications,
concrete, on stream examination of
processing piping where X-ray energy has
to be limited, ash radiography and
microfocus enlargement techniques.
Relative exposure factor with
uorometallic screens depends on:
• temperature
• radiation energy
• exposure time
-0.5 0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.5 1.0 1.5 2.0 2.5 3.0
Density
Log. rel. exp
F8 + RCF
Blue base
D8 + Pb
Sensitometric curves with RCF
uorometallic screens ( 200 kV)
When maximum speed is important the
use of very fast screens such as the
Structurix 1200 screen can further reduce
the exposure time by a factor of three to
six compared to RCF screens.
F8 is the ideal fast, high contrast, high
denition lm for uorescent screen
applications.
When higher sharpness is required we
advise the use of D8 with Pb sc