The Linear Positioning System (LPS) positions instruments, dosimetry, phantoms, etc. precisely and repeatably. The computer controlled LPS is linked to the exposure calculator so that the operator may specify the exposure by distance or exposure rate, time or exposure.
Linear Positioning System
(installed as an upgrade to an existing irradiator)
- Positioning within 1 mm (.04") over 10 meters (33 feet) of travel
- Four axes of motion:
- X - horizontal parallel to the beam - up to 10 meters (33 feet)
- Y - horizontal perpendicular to the beam - 1 meter (39")
- Z - vertical - 30 cm (12")
- R - rotary - 360º
- Quick, repeatable instrument positioning
- Each axis may be computer manually controlled
- Manually controlled axes may be motorized or fully manual
- Rigid extruded aluminum framework
- Adjustable feet for leveling prior to anchoring
- Precision ball bushings riding on hardened steel rails minimize backlash and sideplay
- Black anodized platform is engraved with 1 cm square grid
- Platform drilled and tapped at 10 cm intervals for mounting jigs and phantoms
- Non-rotating platforms are 40 cm (15 3/4") square; rotating platforms are 40 cm diameter
- Platforms support 100 kg (220 lbs)
LPS Instrument Platform and Carrier
with Rotary and Vertical axes and Instrument Camera
(also visible are Jog controls, leveling anchors, and Camera LCD display)
The Instrument Camera allows the operator to remotely monitor an intrument while it is exposed to radiation. A small LCD monitor is provided to facilitate camera setup, and the video signal is brought out to the control panel. An optional interface is available for computer controlled systems to display the video on the computer monitor.
- Low light level, solid state, black and white video camera
- Auto-iris, vari-focal-length (5 - 50 mm) zoom lens
- Adjustable camera mounting attached to LPS Instrument Platform Carrier
- Small LCD monitor (for setup) attached to LPS Instrument Platform Carrier
Jigs and fixtures ensure quick, accurate, repeatable positioning of instruments, dosimetry, ion chambers, etc. on the Instrument Platform.
Sample Ion Chamber and MicroRem Jigs
with a Bicron MicroRem instrument
- Available for a wide variety of survey meters, EPDs, and ion chambers
- Alignment holes in jigs match tapped holes in the Instrument Platform
- Machined pockets or clamps in jigs match the instrument or device shape
Phantoms may be used to simulate flesh when calibrating dosimetry equipment.
40 cm x 40 cm x 15 cm Calibration Phantom
- Available in two sizes: 40 cm x 40 cm x 15 cm and 30 cm x 30 cm x 15 cm
- Machined from a single polymethyl methacrylate plate
- Removable front plate facilitates mounting dosimetry
- Two front plates provided (one may be set up while the other is being irradiated)
The Laser Alignment System accurately traces the centerline of the radiation beam. It may be used to align the LPS or to verify that an instrument or dosimeter is positioned exactly in the center of the beam.
- Class II laser attached to an adjustable bracket
- Adjustment screws allow precise positioning
- May be mounted on LPS framework or wall opposite the beam port
With an attenuator set, one source can function at up to sixteen virtual activity levels. The attenuator set is installed against the beam port / collimator of the irradiator.
0 - 8000X Attenuator Set
Pneumatically Operated
- Four lead shields of different thicknesses to provide 2X, 4X, 10X, and 100X attenuation
- Inserted in the beam in sixteen combinations:
None, 2X, 4X, 8X, 10X, 20X, 40X, 80X, 100X, 200X, 400X, 800X, 1000X, 2000X, 4000X, and 8000X - Mounted on ball bearings which roll in machined grooves
- Available with pneumatic or manual operation
Computer controlled systems may be configured to record information about each exposure in a database. This information includes the temperature, barometric pressure, and a correction factor to STP at the time of the exposure. This information is also recorded in the spreadsheets created during irradiator calibration. The operator may manually enter the temperature and barometric pressure, or the Environmental Monitor may be used to ensure a real-time reading of the current environmental conditions.
- RS-232 serial interface; driver and software included
- Temperature range 50 - 100º ±0.3ºF (10 - 38º ±0.2ºC)
- Barometric Pressure 0 - 15 PSIA (760 - 0 mm Hg) ±0.5%
Electrometers and ionization chambers are available to precisely monitor the dose delivered during an exposure. Computer controlled systems may be configured to record this information for each exposure. Information collected by an electrometer and ionization chamber is also used to calibrate the irradiator; for computer controlled systems this calibration information also is used to configure the exposure calculator.
Typical electrometer:
Standard Imaging Max4000
- Ionization chambers are calibrated with certification traceable to NIST
5940 Gateway Drive, Alpharetta, GA 30004
770-667-5770 / FAX 770-667-7539
sales@hopewelldesigns.com