NE2571A Therapy Dosimetry Ion Chamber
NE2571A Therapy Dosimetry Ion Chamber

NE2571A Therapy Dosimetry Ion Chamber


The 0.6 cm3 NE2571A ionization chamber is developed from the original design by Professor F. T. Farmer. It is constructed from a thin-walled, high purity graphite thimble and aluminum electrode, with a detachable build-up cap which also protects the thimble. Careful guarding of the signal conductors and cable has ensured low post-irradiation leakage. The NE2571A is used throughout the world for the measurement of photon and electron beam dosimetry.
 
Product includes the ion chamber, detachable build-up cap, 10m cable, TNC plug and carrying case.
Physical Characteristics
Sensitive Volume:

Sensitive Length:

 0.69cm3

24.1mm
Thimble materials:

Inner diameter:

Wall thickness:

 99.99% graphite

6.3mm

0.36mm
Inner electrode:

Length:

Outer diameter:

 99.99% aluminium

20.6mm

1.0mm
Build-up cap:

Wall thickness:

Outside diameter

Density:

 Delrin CH20

3.87mm

15.1mm

1.425gm cm-3
Stem: Outside diameter 2MV to 35MV
Energy range for electrons: In suitable phantom (measures absorbed dose to water) 8.62mm
Length of connecting cable: 10m

 

Specification
Sensitive Volume: 0.69cm3
Sensitivity for X-rays of 1mm Cu HVL

4.6 R.nC-1
275 R.min-1.nA-1

46 Gy.μC-1
2.75 Gy.min-1.nA-1
Energy range for X and gamma radiation:
(a) Without build-up cap: (measures exposure) 		50kV to 300kV
(b) With build-up cap: (measures exposure) 0.3MV to 35MV
(c) In suitable phantom (measures absorbed dose to water) 2MV to 35MV
Energy range for electrons: In suitable phantom (measures absorbed dose to water) 5MeV to 35MeV
Leakage current:

Typical:

Maximum:

 5 x 10-15A

1.5 x 10-14A
Maximum exposure rate (approx) or 99% collection efficiency:
Polarising potential—250V

4 kR.min-1, continuous
25 mR/Pulse, pulsed

40 Gy.min-1, continuous
0.25 mGy/Pulse, pulsed
Polarising potential—400V

10 kR.min-1, continuous
40mR/Pulse, pulsed

100 Gy.min-1, continuous
0.4 mGy/Pulse, pulsed

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