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444D Daily Constancy Tool

The 444D Daily Constancy Tool (DCT) is the perfect single channel device to measure photon and electron beam constancy every day of the year. Measuring relative beam output is quick, easy, and reliable with the 444D.

The Daily Constancy Tool has a single diode detector embedded in a uniform density plastic phantom for measuring radiation output. The device is battery operated and completely portable. It only requires an initial set up and then there is no need for preparation when doing routine radiation output tests on linear accelerators.

This Daily Constancy Tool can store up to 10 exposures that show relative dose, relative dose rate, and irradiation time. Multiple exposures can be taken without having to reset the device.

An indicator light will blink to let you know that the 444D is ready for the next exposure. By having this auto reset function, you only have to enter the treatment room a second time to retrieve the Daily Constancy Tool and acquire the necessary data.

With features like these, and automatic pressure correction, you can see why this Daily Constancy Tool product is one of the most time saving devices you’ll ever use in the treatment room.

444D Daily Constancy Tool

444-CAP Laser Alignment Cap for 444D

444-SLABS Solid Water Build-Up Slabs for 444D, 5 pcs.

 

444D Daily Constancy Tool

 

SPECIFICATIONS

Dose Rate Range 1 to 2000 cGy/min

Beam Energy
Photons
1.25 to 25 MV
Electrons 3 to 25 MeV
Field Size 10x10 cm
Temperature Dependence 1% of reading per °C
Long Term Stability ±1.5% of reading over 60,000 Rads (approximately 6 months of use)
Readings Relative Dose (machine output), Relative Dose Rate, Time
Detector Diode
Power Supply 4 AA alkaline batteries (20 hours approx. lifetime)

Physical Dimensions
Weight
1.05 kg (2 lbs 5 oz) Dimensions (H/W/D) 12x32x3 cm (4.7x12.6x1.1 in)

Miscellaneous
• RS-232 port
• Stores 10 complete readings
• No pressure corrections needed

Options
Auxiliary tray holder for Varian (444-TRAY-V) or Siemens (444-TRAY-S) machines
Solid Water 12x12 cm build-up plates (444-SLABS) with thickness of 0.2, 0.5, 1.0, 2.0, and 3.0 cm
Laser alignment cap (444-CAP) to align DCT with sidewall lasers