BEAM THERAPY DOSEMETER
Beam
Therapy Dosemeter is portable digital instrument for an accurate
measurement of dose and dose rate. The
detector is a 0.5 cc. ionisation chamber provided with a perspex buildup
cap, of wall thickness 4.75 mm, to enable calibration and use of chamber
with Co-60 radiation. The
measuring system is an electrometer operational amplifier with a high
megohm resistor for exposure rate measurement and a low leakage capacitor
for exposure measurement connected in the feedback path.
The output of the measuring system is displayed on a Digital Panel
Meter.
SPECIFICATIONS
|
Detector |
: |
0.5 cc. air equivalent ionisation chamber |
|
|
Wall material | : | Tufnol. Perspex build-up cap of thickness 4.75 mm provided for Co-60 radiation |
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Range | : | Two
linear ranges : Exposure rate : 0-1.999 Gy/min. 0-19.99 Gy/min. Exposure : 0- 1.999 Gy 0- 19.99 Gy |
|
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Linearity | : | ± 1% or ± 1 digit. |
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Energy range | : | 30 KeV- 1.3 MeV high energy . photons and electrons (with appropriate calibration factors) |
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Accuracy | : | + 3% |
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Reproducibility | + 0.1% | |
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Chamber voltage | : | + 180 (V) and + 90(V/2) Volts |
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Power requirement | : | Mains (23OV AC, 50 Hz) OR 6 Volts DC (4 x1.5 V'D'type cells) |
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Dimensions | : | 430 mm x. 300 mm x 120 mm |
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Weight | : | 5.5 Kg (without batteries) |
APPLICATION
Useful for measuring beam outputs from
accelerators, X-ray and Telecobalt machines
and for evaluating HVT of X-ray beams
