YY/T 0609-2018General specifications of medical diagnostic X-ray tube assemblies (English PDF)

5.1.2 Power conditions

It is powered by a specific power source.

If applicable, the instruction manual shall give the requirements for the power supply.

5.2 Dimensions and wiring

5.2.1 Dimensions

The instruction manual shall give the main dimensions of the X-ray tube assemblies. The unmarked tolerances of the external dimensions shall meet the requirements of Grade V in GB/T 1804-2000.

5.2.2 Wiring

The instruction manual shall give the wiring diagram of the X-ray tube assemblies.

5.3 Marks

The marks on the X-ray tube assemblies shall meet the requirements of "permanently attached" and "clearly identifiable" in GB 9706.1.

5.4 Focal point of the X-ray tube assemblies

5.4.1 The focal point position shall be marked on the outside of the X-ray tube assemblies.

5.4.2 The nominal value of the focal point shall be marked on the outside of the X-ray tube assemblies. The nominal value of focal point shall be the value determined in accordance with YY/T 0063.

5.5 Nominal X-ray tube voltage

5.5.1 It is specified in the instruction manual.

5.5.2 The X-ray tube components shall be marked with the nominal X-ray tube voltage on the outside.

5.6 Dielectric strength of high voltage circuits

The dielectric strength of high voltage circuit of the X-ray tube assemblies shall be able to withstand 1.1 times the nominal X-ray tube voltage. There shall be no abnormal discharge for 3min, such as flashover and breakdown.

- X-ray tube components, in addition to the ones that are only suitable for mammography of which the nominal X-ray tube voltage is not exceeding 50kV, the mass-equivalent filtering of X-ray tube materials in the X-ray tube components must meet the following requirements:

a) Non-removable material in normal use is not less than 0.5mmAl;

b) All fixed additional filters must be removed with tools;

c) In special applications it shall be stated in the instruction manual.

5.12 Leakage radiation of X-ray tube components

When the X-ray tube assemblies, according to continuous anode input power, are loading in nominal X-ray tube voltage, the leakage radiation at 1m from the focal point shall not exceed 0.88mGy/h.

5.13 High-voltage cable connection

Unless otherwise specified in the instruction manual, the basic dimensions of the connection part between the high-voltage cable socket and the plug shall meet the requirements of 4.1.1 in GB/T 10151-2008.

5.14 Expected service life

The instruction manual shall state the expected life of the X-ray tube assemblies.

The expected service life shall be expressed in years or months or loading times or kilowatt-seconds (kW · s). The CT tube components can be expressed in scan seconds (ss) or scan times.

If the expected service life is expressed in years or months, the basis shall be given in the instruction manual.

5.15 Appearance

The X-ray tube components shall be neat, beautiful, flat, smooth and uniform in color. There must be no defects such as scars and cracks.

5.16 Accompanying documents

5.16.1 The accompanying documents shall meet the requirements for accompanying documents for X-ray tube components in GB 9706.11.

5.16.2 The accompanying documents shall also state the speed of the rotating anode, the single load quota, the series load quota.

5.16.3 The CT tube assemblies shall also specify the nominal CT scan power index in the accompanying documents.

The test voltage of the high voltage circuit is loaded from 50% of the nominal X-ray tube voltage. Start timing after it gradually rises to the specified test voltage value within 10s. The X-ray tube assemblies shall have no abnormal discharge during the test.

In the dielectric strength test, the test voltage shall be kept within the range of 100%~105% of the required value. And it shall be as close as possible to the specified test voltage value of 100%.

During the dielectric strength test of high voltage circuits, if a slight corona discharge occurs in a high-voltage circuit but stops when the test voltage drops to 100% of the voltage indicated by the test conditions, then, this discharge phenomenon can be ignored.

6.7 Nominal anode input power

6.7.1 Nominal photographic anode input power

Check the accompanying documents.

The nominal photographic anode input power can be tested for the compliance with the following tests:

According to the nominal photographic anode input power at the X-ray tube voltage of 100kV and the nominal X-ray tube voltage, it is carried out according to the provisions of YY/T 0064-2016;

The X-ray tube components of which the nominal X-ray tube voltage is below 100kV shall be carried out at the nominal X-ray tube voltage in accordance with the provisions of YY/T 0064-2016; The test duration is not less than 20min.

6.7.2 Nominal CT anode input power

Check the accompanying documents.

The nominal CT anode input power can be tested for the compliance with the following tests:

According to the nominal CT anode input power at the X-ray tube voltage of 120kV and the nominal X-ray tube voltage, it is carried out according to the provisions of YY/T 0064-2016. The test duration is not less than 2h.

6.8 Nominal continuous input power

Check the accompanying documents.