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In the field of maximum exposure, the given electro-energy is measured separately by the dose ratio of the dispersed x rays to the total absorption dose。
A map of the distribution of 24 measurement points based on the average x-ray release radiation in the design of the measuring frame in the wek-ws674 accelerator area m
(a) an external measurement frame in the wek-ws674 accelerator m, an external measurement frame configuration list in the wek-ws674 m area:
| Name | Number | Specifications and uses |
| Put a dosage hole on the probe | 41 | 41 dosage tablets placed in different positions on the disk let's go |
| Aluminium tube placing dosage holes | 32 units | |
| Aluminium tubes 1 | 8 items | 10x10mm, 1448mm long; aluminium tubes 1,3,5,7,9,11,13,15 are connected to the number of the disc |
| Aluminium 2 | 8 items | 10x10mm long 965mm; aluminium tubes 2,4,6,8,10,12,14,16 are connected to the number of the disc |
| I'm going to take a look | 16 | M6 turns fixed the tubes and the discs |
| Explore tray | 1 unit | For placement of detection elements |
| Installation instructions | 1 | I'm sorry |
Test method:
X-ray relative surface dose detection method
It should be measured in a form that is at least 5 cm larger on each side than in the field of exposure; it is at least 5 cm deeper than the depth of the measure, the surface of the input table is vertically in the reference axis and the detector is placed at normal treatment distance。
All radiation beams that are desirable without tools should be removed from the radiation beams, and all integrated filters should remain at their specified position and, in the field of maximum exposure, the relative surface dose of the electron energy given in table 2 should be measured separately。
Through the radiation detection of leaks from the caps
X-ray through the limit device
The measurement conditions are as follows:
With x-ray absorbent material of at least 2 deciles, the ray exit is completely shielded. (b) non-overlapping restraint devices should be measured at the minimum field size
The maximum leaking radiation area is measured by a radiation detector whose cross-section should be 1 cm
The maximum absorption depth in the body model should be measured。
Spill radiation measurements are carried out as follows:
Sets the rectangular field symmetry to a maximum (x direction) multiplied by a minimum (y direction)
24 points measured by radiation detectors to determine their averages and to obtain a percentage value relative to the maximum absorption dose
Set a minimum (x direction) by the maximum (y direction) exposure field in symmetrical terms, repeating the a. 3. 1. 2 b test
Repeat the above measurements for all x-ray energy。
If there is a multi-purpose restraint device, it opens a truncable or interchangeable limit to generate a square field of about 300 cm2 (approximately 18 cm x 18 cm). (b) to close the multi-beamed device to a minimum value consistent with the field of exposure, and to measure the area covered by the multi-beamed device with a radiation detector。
The electronic line crosses the limit
The measurement conditions are as follows:
(a) model composition with 10 mm materials equivalent to tissues, with all sizes of electronic beam limitrs/beam systems, with radio photography at normal therapeutic distance, based on the most unfavourable combination of data measured in the electron energy specified in the model test, at the maximum and minimum energy of the relative
Positioning of the maximum absorption point in the area between the line 2 cm outside the perimeter of geometric exposure and the m area boundary
Measured with a radiation detector with a cross-section of not more than 1 cm2, the probe must have sufficient protection against the radiation dispersed from the material under the radiation detector。
Measurements are carried out as follows:
In area m, a radiation detector is used to measure the eight dividing lines at a distance of 2 cm from the point of 5 cm from the geometry of the field to within the m boundary
For each electronic beam limitr/restriction system, the average of the radiation detector reading corresponds to the percentage of the maximum absorption dose at normal treatment distance on the reference axis。
M emission radiometry (except neutrons)
The measurement conditions are as follows:
Based on the results of the type test, under the combined conditions of giving the maximum released radiation
At all x-ray energy and at the highest level of electron energy, the point of maximum radiation leakage is determined and measured by radiation detectors at these points。