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rouding the collimator.Inlet of collimator is located near
to the reactor core. The opening of inlet is large so
that the neutrons enter into the collimator can be max-
imised as much as possible.

Area for fully illuminated by neutron beam Wf is de-
termined by Equation 5.1. Where Ws is area of incom-
ing neutron beam, D is aperture size, Xap is the dis-
tance from source opening area to the aperture and L
is the length from aperture to detector plane [Grunauer,
2005].

Figure 5.5: Design construction parameter has the relationship

with the total illuminated area Wf of the collimator [Grunauer,
2005].

Wf = –D + Ws ( Xap + L) – Ws (5.1)
Xap

5.2.2 Image Detection and Recording

Conventional radiography used celulose film coated
with fluorescen materials was used to record the im-

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