Specifications

Photon Beam Parameters

Nominal X-ray Energies (MV)Beam I Beam II

6 106 156 188 158 18

Beam CharacteristicsNominal Energy (MV)

D max (cm)

% Depth Dose @ 10

cm.

Dose Rate *

6 1.5 +/- .2 67 +/- 2 80/4008 2.0 +/- .2 70 +/- 2 80/40010 2.4 +/- .2 73 +/- 2 80/40015 3.0 +/- .2 77 +/- 2 80/40018 3.3 +/- .2 80 +/- 1 80/400

* Dose Rate Variable In 5 Steps

Field Size: The field size is continuously variable from 0X0 to 35X35 at one meter TSD.Flatness: The variation of X-Ray intensity over the central 80% of the longitudinal and transverse axes, measured at a depth of 10 cm in a tissue equivalent phantom at a TSD of 100 cm, will not exceed +/- 3% of the mean value.Symmetry: The integrated doses to corresponding points within the central 80% of the longitudinal or transverse axes of the field at one meter TSD measured at a depth of 10 cm in water will not differ more than +/- 2% of their mean value.

Electron Beam Parameters

Electron Energy Groups (MeV)Group I Group II Group III Group IV

6 4 6 49 6 9 612 9 12 915 12 16 1218 15 20 16

Dose Rate: The dose rate at maximum buildup for a 15 X 15 cm field is variable in five fixed steps from 80 to 400 monitor units/minute at one meter.Field Size: Electron collimation will provide a range of field sizes from 4 X 4 cm to 25 X 25 cm at one meter.Flatness: The variation in intensity over the central 80% of the longitudinal and transverse axes, measured at the depth of the maximum buildup in a tissue equivalent phantom at a TSD of 100 cm will not vary more than +/- 5% of the mean value.Symmetry: The integrated doses to corresponding points within the central 80% of the longitudinal or transverse axes of the field at one meter TSD measured at a depth of maximum build up in water will not differ by more than +/-2% of their mean value.X-ray Contamination: The central axis intensity for 15 X 15 cm field at 10 cm beyond the depth of the 10% isodose line in a water phantom will be <5% of the maximum intensity.