Tungsten fishing beads are twice as heavy as brass and heavier than lead. Perfect for any fly that has to get down deep.

And tungsten fishing bead also enable the fisherman to fish in fast flowing water where the fish lie deep.

Furthermore ,tungsten alloy fishing bead is non-toxic, therefore tungsten fishing bead is friendly to the environment.

So tungsten alloy fishing bead is the best friend to fisher man.




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1: No focusing structure. Early MLC is mainly used for small lesions in the head and ill miniature MLC, mostly pan structure leaves no focus. This leaves the vertical and horizontal thick blade used in all translational motion, the same size and shape of the radiation field is composed of the upper and lower blades, can not be eliminated through shot penumbra, which will result in a larger clinical unacceptable penumbra.

2: Single-focusing structure. : This structure makes all the blades are in a circle with radiation to the radiation source to the distance of the circumference of the bottom surface of the blade radius of movement, so that the end face of the blade is always parallel with the beam, eliminating wear shooting direction of the blade movement on the penumbra . However, in the direction perpendicular to the blade movement, due to the width of the blade up and down and so on, they still have to wear shot penumbra.

3: double-focusing structure. Double-focusing structure is a multi-leaf collimator tungsten alloy single-focusing structure of each leaf is processed into non-monospaced divergence like in the width direction, face showing the trapezoidal small great, upward extension cord should intersect each end to point sources. This structure can eliminate wear shoot penumbra.

4: leakproof shot structure. Leakproof shot structure of the alloy multi-leaf collimator leaves processed into tungsten each side with a groove, the other side with a tenon that between two adjacent pieces to bump-groove laminated, using ray only travels in straight lines Features get a good shot of leak-proof effect.

5: over the center line design. Blade movement over the center line travel is a necessary condition to achieve strong performance conformal irradiation and become one of the important indicators to measure the strength of the modern MLC function, tungsten alloy multi-leaf collimator leaf over the center line travel requirements should be as large as possible generally not less than 12cm.


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Improve the tungsten alloy multi-leaf collimator  is mainly shot around the lower leakage and improve conformal reduce transmission penumbra, adapt to the dynamic and dynamic wedge, etc. Function Deployment. Width of the multi-leaf collimator tungsten alloy blades directly determines the irregular wild and planning target volume (PTV) multi-leaf collimator consisting of conformal shape, the thinner the blade, its conformal better. Height tungsten alloy multi-leaf collimator leaves must be able to weaken the original rays and radiation intensity to 5% or less. Due to some radiation leakage between the blades often will reduce the shielding effect of the original radiation leaves, so the blade height to be properly thickened, usually on the thickness of the tungsten alloy selected to be less than 5cm, to be reduced to 2% leak-ray dose below, the thickness of the tungsten alloy needs to 7.5cm.

Longitudinal section of the blade design has two main factors: first, to make solar radiation leakage between adjacent blades and vanes close relative when the minimum, so the blade side tungsten alloy multi-leaf collimator slot to use more bump each other mosaic structure . The blade design of the end face there are generally two types of vertical face and the end face that is curved. Second, a bottom surface and a top surface of the blade to be converged in a plane perpendicular to the direction of movement of the position of the X-ray target, so that the blade cross-section has a trapezoidal structure so that the blades associated with any one of from the source (target) radiated, and with ray parallel to this plane.


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Tungsten nickel alloy gravity is generally 17.0 to 18.5, a tungsten-based (about 90 to 98 percent), and add nickel, iron, copper or other elements of the alloy composition. This alloy has good plasticity, machinability, thermal conductivity and electrical conductivity, while the X-rays or γ-rays with excellent absorption capacity. Because of this characteristic tungsten nickel-iron alloy, and it is often used in the manufacture of military blasting ring.

Advantages tungsten nickel-iron alloy military blasting ring are: a large proportion: General accounting for 16.5-18.75g / cm3; 2 high strength: tensile strength of 700-1000Mpa; 3 ray absorption ability: than lead high 30 -40%; 4 thermal coefficient: thermal conductivity of tungsten alloy tool steel is 5 times; five thermal expansion coefficient is small: only 1 / 2-1 / 3 iron or steel.


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New materials, also known as advanced materials, refers to recent research success and being developed has excellent features and functionality to meet the needs of high-tech new materials. The new material is the material basis of military weapons and equipment, the new generation is a key technology in today's world the military field. The military is a new material technology and new materials technology for the military field, is the key to modern sophisticated weaponry. The melting point of tungsten metal in the highest, and its prominent advantage is to bring high-melting material good high temperature strength and corrosion resistance, especially in military weapons manufacturing industry showed excellent properties. In the weapons industry which is mainly used in the production of armor-piercing warhead, the main battle tank has a large aspect ratio penetrators, small and medium-caliber anti-aircraft armor-piercing kinetic energy penetrators and ultra-high speed core material with a bomb.

Tungsten alloy powder pretreatment technology by and large deformation strengthening technology, grain refinement of materials, elongated grain orientation in order to improve the toughness and penetrating power of the material. Our main battle tank developed 125Ⅱ type tungsten penetrator core material for the W-Ni-Fe, using variable density compacts sintering process, the tensile strength of 1200 MPa average performance reached more than 15% elongation, tactical and technical indicators for 2000 m from the breakdown of 600 mm thick homogeneous steel armor.

 

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Adiabatic shear is under high strain rate loading conditions of material deformation and fracture of a special mechanism, adiabatic shear band is the material or component of shear strain highly concentrated narrow area. Adiabatic shear deformation localization in a wide variety of metal suffered explosions, penetration, high-speed collision, such as high-speed cutting and abrasion during deformation, after the pre-tungsten alloy tungsten grain deformation reverse direction with the maximum shear stress direction close to the bomb target impact process in favor of adiabatic shear deformation and shear failure occurs. Therefore, to improve the performance of adiabatic shear tungsten alloy material to enhance the performance of tungsten alloy rod projectile penetration is currently one of the hotspots.

For half a century, tungsten alloy rod bomb adiabatic shear deformation studies, mainly in three aspects: first, starting from the constitutive relation tungsten alloy, establish adiabatic shear deformation localized instability model; second from microstructure, structure starting to explore the microstructural characteristics of the organization and its nucleation and micro factors grew up; third, using computer numerical simulation of the evolution of adiabatic shear band and should stand the strain and temperature fields research.


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Kinetic energy penetrator armor-piercing capability (speed, quality) and artillery material determines their physical properties when the shells hit the target. The kinetic energy depends on the speed and quality at speeds in certain circumstances, be increased to increase the quality of artillery projectile kinetic energy penetrators therefore generally made ​​of high density, hard, high temperature metals. At present the material more widely used is tungsten alloy and depleted uranium, but because depleted uranium has a radiation, so use less.

Promote the progress of science and technology to gradually increase the power of the penetrator. In evaluating the piercing armor-piercing capability, the standard is much more commonly used military homogeneous steel armor piercing mm depth equivalent. In World War II, the most famous German 88MM gun fired projectile can penetrate 200MM homogenous steel armor. Currently, tungsten alloy penetrators German L55120MM caliber tank gun fired homogenous steel armor can breakdown 810MM on the 2000M distance; in China, 99 tanks equipped with a tungsten alloy penetrators 125MM artillery fired on with a 850 mm armor-piercing capability same distance.




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The development of tungsten alloy penetrators materials has made considerable progress on technology, but there are still some drawbacks. So it  need to study tungsten alloy penetrators in depth :

1: Increase research utilization, scientific environmental aspects of the recovery of tungsten alloys. Strengthen missile recycling tungsten alloy and tungsten scrap cuttings and low raw consumption technology research and development.

2: Strengthening research on tungsten alloy penetrators performance and insulation piercing sensitivity aspects. Armor-piercing shells performance is the most important performance indicators tungsten alloy, relatively few studies in this respect, especially playing board study of the mechanism of action is not deep enough, should also strengthen research adiabatic susceptibility tungsten alloy materials.

3: Research to improve air defense missile systems and armor-piercing capability of damage, enhance the tungsten alloy brittle material and wear Bouncing burning complex functional elastomer material.

4: High Strength Composite armor-piercing tungsten is an important development direction of future ultra high-speed kinetic energy penetrators should be further strengthened with ultra high-speed kinetic studies tungsten penetrator projectile beam composite materials, targeted to carry out bomb with a tungsten alloy corrosion protection technology research.


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Fishing beads can be as an attractor or be a component of the rig when you are fishing.

Fishing beads can be made from plastic, brass, lead, tungsten and so on. And they come in many different colors.

There are also luminous beads made of plastic which glow in low light when the water you are fishing has low visibility to attract fish.

However, tungsten alloy fishing bead becomes more and more popular because of its good properties.

Tungsten fishing bead is made from tungsten alloy, so some peple call tungsten alloy fishing bead as tungsten fishing bead.





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Tungsten alloy is excellent material which is used to shield the x-rays and gamma rays . The shield tungsten alloy can be used in the medical field such as shield Brachytherapy and positron emission tomography.

Brachytherapy, also known as in internal exposure. When the human body is difficult to track the tumor tissue ,it can be used to inject (one of brachytherapys ) to replace radiotherapy. Injecting radioactive particles can be accurately placed evenly around the tumor. Before and after treatment, radioactive seeds are stored in tungsten alloy products, so that doctors and patients from harm.

Positron emission tomography (PET) .tracer isotope will be injected to the human body, and brain tissue encounter electrons positron isotope released ,the annihilation effect will occur, resulting in almost the opposite direction of the pair of rays γ- can a special device to be detected, whereby the position of the distribution of the isotope can be obtained, which is a method for diagnostic nuclear medicine techniques. When X-rays illuminate the body structure, PET can show the individual chemical functions of internal organs. PET of DNA to be injected, the injection from the syringe into the patient. As DNA passes through the patient's body, it will release gamma rays, gamma camera lights by chemical activities and internal organs such cells can be seen. Tungsten alloy and tungsten can be applied to PET syringe needle shielding.


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