A radiation apparatus including a radiation source and a collimation assembly is provided. The collimation assembly may include a tungsten multileaf collimator, a motion assembly, and other fixed and movable beam limiting devices. Tungsten multileaf collimator includes a support body and a plurality of pairs of tungsten beam blocking leaves supported by the support body in one or more planes, and the leaves of each pair are longitudinally movable relative each other. The motion assembly includes an actuator and a guide assembly operable to move the support body thereby allowing the one or more planes of tungsten beam blocking leaves to rotate about the radiation source.

In a radiation method, the shape and motion of a tungsten target in a subject is determined. A radiation beam is provided from a source to tungsten target. A treatment field substantially conforming to the shape of tungsten target is defined using a tungsten multileaf collimator assembly comprising a support body and a plurality of tungsten beam blocking leaves supported by the support body. The defined treatment field is moved by moving the support body with the motion of the target.

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A collimation assembly including a tungsten multileaf collimator and a motion assembly is provided. Due to tungsten alloy has high density, excellent radiation attenuation properties, and environmental friendly, it is widely used to produce tungsten multileaf collimator in a collimator assembly. Tungsten multileaf collimator comprises a support body and a plurality of pairs of tungsten beam blocking leaves supported by the support body.

Tungsten leaves of each pair being longitudinally movable in a first direction; and the motion assembly comprises an actuator and a guide assembly operable to move the support body thereby allowing the plurality of pairs of tungsten beam blocking leaves to move in a second direction generally transverse to the first direction and the beam axis.

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6. The overhaul of capacitor capacity

First, put the capacitor flatly on the cylinder head, and make the housing grounding, then, the high voltage bus is aligned with capacitor wire head about 5mm, then struck tungsten contacts of distributor, so that high-voltage current charged in the capacitor 4-5times. At this time move the capacitor wire head into the housing of about 3mm, if the following phenomenon appears, then the capacity of the capacitor is small and should be replaced. Phenomenon: Flash over, but the spark is weak and sound is small, sparks are dark red; if the following phenomenon appears, then the capacity of the capacitor is large, you don’t need to replacement it. Phenomena: flashover and the sound are louder, with blue sparks.

7. The overhaul of battery wire connection

Remove the oxide of each wire connector and tighten the wires.

8. The overhaul of generator

You can appropriately increase the contact gap of tungsten contacts to avoid the engine is rotating in low speed for a long time.




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4. The overhaul of tungsten contacts ablation on tungsten contact spring arm in distributor

If there is no spring balance, you can check tungsten contacts gap firstly. If the gap is greater than the 0.37mm, that is normal, then the tungsten contacts are closed, and then hand struck tungsten contacts to test fire, if there is a strong high voltage spark, then the tungsten contact spring arm is too soft.

If you have a spring balance, then: You can use spring balance to hook one end of the active tungsten contact arm, when the contact is opened, if the reading on the spring balance does not meet the spring force standard of tungsten contact of the car model, you should replace it, On the other hand, you do not need to replace it.

5. The overhaul of capacitor ground

You must fasten the capacitor case and tighten the wire point in order.




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2. The overhaul of tungsten contacts ablation on riveting loose or bracket set screw loose.
First, open the distributor cap, the first is visual inspection of the condition of tungsten rivet and contacts bracket set screw loose situation, and then, and then pull the two tungsten contacts back and forth. If the tungsten contacts are loose, then: you should remove tungsten contacts, re-riveting, to make it no loose, or replacement tungsten contacts directly.
If the tungsten contacts bracket set screw is loose, then tighten it.

3. The overhaul of the skew and offset condition of contact surface.
First, open the distributor cap, the first is visual inspection of the offset, skew situation.
If the contact surface offset, then: You can adjust the gasket of active tungsten contact arm.
If the contact surface of tungsten contacts has skew or excursion, then: You can use pliers to twist tungsten contacts frame to correct.

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1. The overhaul of tungsten contacts gap in distributor.

Open the lid of the distributor, shake and rotate the engine, so that tungsten contacts of the distributor is in good state, then, check the gap among tungsten contacts, to see whether it is less than 0.37mm, if less than 0.37mm, we need to check the extent of tungsten contacts ablation, otherwise, you do not need to check.

If the extent of tungsten contacts ablation is very serious, then: Firstly, put on gloves, remove the tungsten contacts, and put it on a flat stone; then, get some oil in your hand, then pull back and forth parallel to polish tungsten contacts, to prevent partial wear during, you should not use hand to swing it .

If the extent of tungsten contacts ablation is not serious, then: using platinum sand bar or fine sandpaper to smooth ablation. When using fine sandpaper, fine sandpaper can be turned over, so its sand finish is outwardly facing to polish tungsten contacts, and then be turned back, and erasing the dirt left by milling until tungsten contacts is clean.




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First of all, you should add appropriate proportion of nitric acid (8 mol / L) to scrapped silver tungsten points, and then heat them. You should filtrate after the above process, besides, the filtrate and scrubbing solution could be used together to prepare ultra-fine silver powder. Then, you should smash and sieve the residue after drying them.

Then, you should put the materials after first silver leaching process into the sintering furnace, and sinter 2h at a temperature of 500 ℃.

At last, you should wait until it cooling, and add nitric acid (8mol / L) to carry out secondary silver leaching, then cooling and filtering.




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Firstly, adding a certain amount of nitric acid (8 mol / L) to scrapped silver tungsten contacts, and then heating it. After that, filtration, and the filtrate and scrubbing solution can be used together for the preparation of ultra-fine silver powder. Then, smashing and sieving the residue after drying.

Secondly, put the materials after first silver leaching process into the sintering furnace, sintering 2h at a temperature of 500 ℃.

Finally, cooling, and adding nitric acid (8mol / L) to carry out secondary silver leaching, then cooling and filtering.




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If you electrify silver tungsten points for a short time, for one thing, the temperature of its contact surface will rise sharply, for another, because the current lines near the beam area is curved, it will appear the phenomenon of short-arc of silver tungsten points. The aforementioned conditions will melt silver tungsten points, and it will lead to silver tungsten points welding eventually. If the current used to energize silver tungsten points is near to the critical value of welding current, to some extent, silver tungsten points be welded. The material of silver tungsten points and its surface state will influence the welding resistance of silver tungsten points directly. In case of that there are surface film layers and uneven energized treatment, so you can reinforce the weld of silver tungsten points.

Silver tungsten points possess high welding force and welding strength. The initial welding current of silver tungsten points is around 1000A, and its maximum welding force is about 165N when the current is 0.9 peaks current; and silver tungsten points possess the largest welding strength of 750Pa around when the current is 4600A.




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If you energize silver tungsten contacts for a short time, on one hand, the temperature of its contact surface will be a sharp rise, on the other hand, it would make silver tungsten contacts short-arc because the current lines near the beam area is curved. The above two conditions will make the silver tungsten contacts melt, that is to say, it would lead to silver tungsten contacts welding. If the current through silver tungsten contacts is close to the critical value of welding current, silver tungsten contacts will be welded to some extent. The material of silver tungsten contacts and its surface state will directly affect the welding resistance properties of silver tungsten contacts. You can reinforce silver tungsten contacts’ welding in case of: there are surface film layers and uneven energized treatment.

Silver tungsten contacts materials have high welding force and welding strength. Silver tungsten contacts’ initial welding current is about 1000A, when the current is 0.9 peaks current, its maximum welding force is around 165N; when the current is 4600A, silver tungsten contacts have the largest welding strength of about 750Pa.




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