Operating Manual

Part of the Agfa film range with relative exposure factors and code classification has been
listed in table 1-8 for various radiation intensities :
Note I: It is common practice to compare relative exposure factors with those of D7 film, which
are shown bold as reference value 1.0 in the table.
Note II: The numbers (1) to (5) used in the table indicate the use of the following screen types:
1 without lead screens
2 with lead screen 0.027 mm thickness
3 with lead screen 0.027 mm thickness
4 with lead screen, front 0.10 mm, back 0.15 mm thickness
5 with fluorometallic screen (RCF)
Note III: Developing process for table 1-8: automatic, 8 minute-cycle, 100 seconds immersion
time in developer G135 at 28˚C.
Note IV: The relative exposure factor depends not only on radiation intensity, but also on expo-
sure time and is, therefore, not a constant value.
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Figure 3-8 shows graphs of relative exposure time versus density for the entire Agfa D-film
range. For density 2, the difference between a D8 and a D2 film is a factor 14 (10
(3.25-2.1)
),
at 200 kV.
Filmtype
Fig. 3-8. Density graphs of the
Agfa film range D2 through to D8
with lead intensifying screens at 200 kV
and automatic film development.
Note: Developing process for figure 3-8 above:
Automatic, 8 min cycle, 100 seconds immersion time in developer G135 at 28˚C.
Table 1-8.
Listing of various Agfa films and their relative exposure factors and film system classification
log.rel.exp.
density
Film type Relative exposure factors Film system
Class
100 kV 200 kV 300 kV Ir192 Co60 EN 584 -1 ASTM
(1) (2) (3) (4) E 1815
D2 9.0 7.0 8.0 9.0 C1 Special
D3 4.1 4.3 5.0 5.0 C2 1
D4 3.0 2.7 3.0 3.0 C3 1
D5 1.7 1.5 1.5 1.5 C4 1
D7 1.0 1.0 1.0 1.0 1.0 C5 2
D8 0.6 0.6 0.6 0,6 C6 3
F6+RCF (5) 0.174 0.132 0.389 0.562
F8+RCF (5) 0.03 0.022 0.035 0.040