GB/T 36017-2018Non-destructive testing instruments—X-ray fluorescence analysis tube (English PDF)

3.1 Models and specifications

See Table 1 for models and specifications of X-ray fluorescent tube.

4.4 Reliability requirements

4.4.1 The X-ray air kerma rate shall meet the requirements of Chapter 3 of GB 22448-2008.

4.4.2 The X-ray fluorescent tube's life, namely its cumulative working time limit, shall not be less than 500 h. The intensity of the impurity line within the working time limit shall not exceed 100% of the value that is specified in Table 4.

4.4.3 The X-ray fluorescent tube oil seal shall be good and without evidence of oil leakage; the oil pressurization shall be greater than 45kV/2.5mm.

4.4.4 The X-ray fluorescent tube is anode-grounded water cooling; the water seal is good and without leakage or water seepage; the water flow must be smooth; the water flow shall meet the requirements of Table 6 and be able to work normally.

4.4.5 The X-ray fluorescent tube shall have sufficient mechanical strength. After the test, of which, the acceleration is 39.2 m/s², the frequency is 40 times/min, and the continuous shock is 500 times, the external structure and electrical parameters of the fluorescent tube shall meet the requirements of this Standard.

4.5 Appearance quality requirements

4.5.1 The roughness of the installation sealing surface of X-ray fluorescent tube and fluorescence spectrometer shall not be lower than Ra = 1.6.

4.5.2 The anode cooling device of the X-ray fluorescent tube shall be made of corrosion-resistant materials; the outer parts of the tube shall have anti- […]

5.4 The rated power, maximum tube voltage and maximum tube current of the X-ray fluorescent tube

5.4.1 Test of the rated power of the X-ray fluorescent tube

Apply the filament current (voltage) which is specified in the product documentation; preheat according to the specified preheating time; apply half the tube voltage which is specified in the product document; then adjust the filament current (voltage), so that the anode current reaches the current value that is confirmed by the rated power of the fluorescent tube under the specified tube voltage; then raise to the specified value at a speed of not more than 10 kV/min, and, at the same time, adjust the filament current (voltage) to keep a constant anode current.

5.4.2 Test of the maximum tube power of the X-ray fluorescent tube

Install the fluorescent tube on the test bench; according to the specified working procedure, adjust the tube current and the tube voltage to the maximum values; read the tube voltage value by the indication number of the voltmeter needle.

5.4.3 Test of the maximum tube current of the X-ray fluorescent tube

Install the fluorescent tube on the test bench; according to the specified working procedure, adjust the tube current and the tube voltage to the maximum values; read the maximum tube current value by the indication number of the milliampere hand.

5.5 Emission characteristics of the X-ray fluorescent tube

Adjust the high-voltage time controller to the permissible conditions; adjust the filament current (voltage) to a certain value; then apply a given tube voltage until the tube voltage, when loading, still meets the given value. Read the corresponding anode current value. The same method can be used to measure the anode current Ia = f (If) (filament current) curve under (a set of) given tube voltages.

Since the filament circuit is in the high-voltage circuit; therefore, the filament current If cannot be directly measured in the high-voltage circuit; however, the relationship between the primary and secondary turns ratio can be used to indirectly and roughly measure the filament current; also, the filament current value of each coordinate point, under the circumstance when the high voltage is turned off, can be used to directly measure the exact filament current value.

5.6 X-ray fluorescent tube impurity line

5.6.1 Test of X-ray fluorescent tube spectral purity

The spectral purity test shall be carried out on an X-ray diffractometer.

It is also available to firstly calculate the integrated intensity of Kbeta1, then calculate the intensity of Kalpha1 according to the ratio of Table 7. If Kalpha1 and Kalpha2 can be separated in their higher-order wave (take n=2 or more in nlambda=2dsintheta), the high-order line graph can be scanned at a large angle (theta), and the same peak envelope integral can be utilized to calculate the relative intensity H of the impurity line intensity.

b) If, in the obtained line graph, the impurity spectrum is so small that the integrated intensity is hard to calculate, reduce the attenuation rate and re-scan the small range near the angle of the impurity spectrum; use the larger peak envelope to calculate the integral intensity; then reduce the corresponding multiple.

c) This method is also applicable to point-focus X-ray tube spectral purity testing.

d) If the shape or cooling method of the to-be-test tube is not compatible with the current diffractometer sleeve, a special sleeve shall be designed and configured.

Calculate the relative intensity of the impurity line according to Formula (1):

Where:

H -- relative intensity of the impurity line;

Az -- the strongest impurity line integral intensity;

At -- the integral intensity of the target characteristic line Kalpha1.

5.7 X-ray fluorescent tube radiation cone angle measurement

Place the X-ray film 1 and 2 at the center line position of the X-ray radiation window as shown in Figure 4.

7.1 Signs

Each X-ray fluorescent tube shall be fixed with a nameplate (sign) in an obvious and appropriate position; the contents include the following:

a) Product name;

b) Models and specifications;

c) Main technical parameters;

d) Delivery date and number;

e) Manufacturer's name and trademark.

7.2 Packaging

7.2.1 The packaging of X-ray fluorescent tube shall be in accordance with relevant provisions of GB/T 13384; and packaged form shall be provided according to the user's requirements.

7.2.2 The packing box shall be equipped with anti-seismic measures and moisture-proof measures inside; it shall be in line with provisions of GB/T 25480.

7.2.3 The characters and signs on the outer wall of the package shall be clear and tidy, and shall not be obscured by handling friction or time. Its contents include:

a) Product name;

b) Receiving unit and address;

c) Delivery unit and address;

d) Signs such as "fragile items", "upward" and "fear of rain" on the packaging box, which shall meet the requirements that are stipulated in GB/T 191;

e) Product implementation standard number and name.

7.2.4 The following documents shall be attached to the package:

a) Product packing list;

b) Product certification;

c) Product instruction manual. […]