Ionization chamber in nuclear medicine

1. ANAS ALHAZMI

2. Radiation detection has two effects :
1- ionization

3. 2- excitation

4.  in N.M we have two types of radiation
detection :
1- gas filled ( used for non-imaging )
2- (scintillator) ( used for imaging )
Gas-filled detectors function by measuring the
ionization that radiation produces within the
gas .

6. 1- ionization chamber
2- G.M counter
3- proportional counter

8.  The ionization chamber is the simplest of all
gas-filled radiation detectors, and is widely
used for the detection and measurement of
certain types of ionizing radiation; X-rays,
gamma rays and beta particles.
Conventionally, the term "ionization
chamber" is used exclusively to describe
those detectors which collect all the charges
created by direct ionization within the gas
through the application of an electric field.

9.  Is an ionization detector which main function is to
measure . the ion pairs created when ionization
mediation through the gas . the ion pairs are
attached either in the positive or negative
electrodes which are then connected the battery
therefore reading measurement of ionizing
radiation ( AKA ionization induced electric )

10. Free-air chamber
Vented chamber
Sealed low pressure chamber
High pressure chamber
Research and calibration
chambers

12. As voltage is increased in the ionization 
there is no appreciable increase in .region
the pulse height. The field strength is more
than adequate to ensure collection of all
ions produced; however, it is insufficient to
cause any increase in ion pairs due to gas
amplification. This region is called the
ionization chamber region

13. Accurate and precise
Recommended for beam calibration
 Instant readout
 using in N.M ( hot lab)
 for important structure in dose
collimator

14. Connecting cables required
 High voltage supply required
Many corrections required for high energy 
dosimetry

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