Atec 660 User Manual

Victoreen Model 660 Series

Parallel Plate Ion Chamber

For diagnostic beam measurements
For scatter radiation measurements
Compatible with 660 readout
Ambient Dose Equivalent versions available

INTRODUCTION

The 660 series probes feature a circuit concept which provides a noise free
transmission of data. The ion chamber current output is converted to a low
impedance digital pulse train in the probe handle, so that cable flexing has no
effect on the measurement. These probes are intended for use with the Model 660
instrument only, which supplies the operating voltages, senses individual probe
sensitivity, and converts the digital pulse frequency into units of radiation. Model
numbers 660-3, 660-4A, and 660-5 are read in Roentgens. Model numbers
660-3-DE, 660-4A-DE, and 660-5-DE are read in Sieverts and are dose equivalent
versions. They have typical energy dependence curves per ICRP recommendations
for ambient dose equivalent.

APPLICATIONS

The 660 probes make use of ion chamber technology, ideal for use in standard
radiology, fluoroscopy, and mammography quality assurance programs where
inbeam
exposure and exposure rate measurements over a broad range of kVp energies
are required. The 660-5 Scatter Probe is designed primarily for Health Physics
exposure assessments of scattered radiation.

FEATURES

• Circular parallel plate ion chambers have assured atmospheric communication

• The 660 family of chambers also maintain precision within 1% short
term and 2% per year at 20°C exclusive of air density or energy response

• The 660 series converts the ion chamber current to a pulse train thereby
eliminating effects from flexing cables

• Ambient Dose Equivalent versions of these probes have energy response
curves per the ICRP recommendations

SPECIFICATIONS
Series Number

Application
Probe Volume
Measurement Area 10 cm2
Maximum Rate
Maximum Exposure
Resolution on most

sensitive range
Rate

Resolution on most
sensitive range
Exposure
Intensity Limit for
99% Collection
Efficiency

660-3
660-3-DE

Diagnostic Beam
Measurement
4cc

999 R/min 99.9 R/min 9.99 R/hr

99.9 R 99.9 R 99.9 mR
10 mR/min 1 mR/min 0.1 mR/hr

1 mR 0.1 mR 1 µR

4 R/sec 1.8 R/sec 10.8 R/hr

660-4A
660-4A-DE

Diagnostic Beam
Measurement
4cc

10 cm2

660-5
660-5-DE

Scatter
400 cc
100 cm2