Fluke Biomedical 30-471 - Manual (Page 6)

Nuclear Associates 30-471
Operators Manual
1-2
1.2 Specifications
Sensitivity: 1.5 nC/cGy
Diameter:
Phonton: 12 mm Diameter
Electron: 11 mm Diameter
Cable Length: 2 meters
Output Polarity: pos/neg
Weight: 42 gm
Sensitive Volume: 0.25 mm 3
Linearity: 2.25%
Reproducibility: 0.2%
Temp. Dependence: < 0.5% /°C
Angular Dependence: Refer to the graphs on page 18 - 25
Rad Damage @10 kGy: < 15%
Operating Temp.: 10° C to 40° C (50° F to 104° F)
Relative Humidity: 5 to 95%, non-condensing
1.3 Accessories
Part Number Description
VeriDose QC
(37-705-5000)
Dual purpose acrylic phantom, daily QA, flatness/symmetry & depth
dose
Diode Detector Holder
(37-492-1000) Acrylic, 5-slot, wall mount
Calibration Fixture
(37-705-4000) Acrylic, 5-slot
Extension Cable
(88-490) 10 meter low noise coaxial cable
1.4 Calibration Technique
The VeriDose diode detectors are part of a dose monitoring system. In order to obtain accurate results,
the detectors must be used with a suitable patient dose-monitoring device. The VeriDose V, available
from Fluke Biomedical, Radiation Management Services is a 5-channel dose monitor designed
specifically for use with this type of detector. A calibration fixture is available to hold the detectors in a
fixed, reproducible geometry during the calibration process. For optimum performance, the detector must
be used within the energy range for which it was designed. Since the detectors are designed with an
internal build-up cap, additional build-up is not required.
It is recommended that the system be calibrated under clinical conditions at which the detectors will be
normally used. Since the calibration process will associate a particular detector to a specific channel on
the dose-monitoring device, it is necessary to exercise caution when reconnecting the detectors for
subsequent measurements. Each detector must be connected to the channel to which it was calibrated.