Firma:              Philips

Modell:            Cr 3378/00

Kommentar:    Dokumente engl.

X-ray tubes are used to analyse materials in a non destructive way and will produce dangerous X-rays only when a high voltage is applied.

The tube contains:

•     an evacuated envelope with a ceramic insulator;

•     less than 0.6 gram beryllium metal;

•     common parts of steel, brass, copper, rubber and small amounts of gold, silver, tungsten    etc.;

•     various anode coatings (target materials) such as chromium, iron, cobalt, copper or molybdenum;

•     no oil;

•     less than 50 grams of lead.

Specifications

General

The tube consists of a metal/ceramic tubular body mounted in a metal housing.

The anode is kept at ground potential and the cathode at a high negative potential.

Mechanical

Dimensions:

Weight:            1.8 kg

Electrical.

Maximum H.T.:                        60 kV

Maximum anode current:        BF: 60 mA

                                               LFF: 55

Standby setting:                      40 kV / 10 mA

Environment.

Temperature environment:

          operation:                      +5°C to 40°C

             storage:                      -40°C to +70°C

Electrical safety:                      IEC1010-1

Radiation safety with standard tube shield:

< 1 µSv / hr measured at 10 cm distance.

Cooling

The tube requires a stable and uninterrupted flow of cooling water with the following properties:

Miscellaneous

Be window.

The window is coated to protect it from moisture.

The coating is slightly yellow; during use it will become a little darker in colour. This does not affect the quality of the tube.

Window                diameter:          14 mm

                            thickness Be:   300 µm

Transmission:      CrKa:               82 %

                            FeKa:               89

                            CoKa:               92

                            CuKa:               94

                            MoKa:               98

Focal spot.

Dimensions (typical values):

Broad Focus:                               2.0 x 12 mm

Long Fine Focus:                         0.4 x 12

Visibility angle (with no intensity loss over range):

line focus:                                     0 — 17°

point focus:                                  0 — 20°

The small indentation at the right hand side of the type plate indicates the window through which the focal spot is seen as a point. The focal spot is also seen as a point through the opposite window; through the other two windows the focal spot is seen as a live.