Abstract:
Using of Gammacell 220 Excel irradiators is widely spread in many
countries. This type of irradiators is being used for research
purposes.
Gammacell 220 Excel was provided by the International Atomic
Energy Agency (IAEA) to the Radiation Processing laboratory of
Sudan Atomic Energy Commission (SAEC). It is a self-contained
gamma irradiator and self shielded, this makes it operates safely.
Dose calibration for this cell is important for samples irradiation. In
this work, a dosimetry system for the GC220E of SAEC was
established using Fricke dosimeter. Fricke dosimeter has a
confidence 95% in the range not exceed 400 Gy.
To establish routine dosimetry at high doses up to 5000 Gy,
Alanine dosimeter was used. This range can demonstrate the
ability of GC220E to deliver known controllable doses in
reproducible manner for high doses.
The irradiation specifications often include a lower and upper limit
of absorbed dose or central target dose. Absorbed dose mapping
was carried out by both dosimeters to determine the magnitude
and locations of D.max and D.min in the irradiation chamber. The
results are in good agreement with dose distribution given in the
machine manual.
A comparison between the tow dosimeters was done and
explained.
