Tungsten Medical Shielding Application

Tungsten medical shielding application is using as collimator for its high density.

It is the most effective material for shielding and has good machinable, so it is widely usedfor radiation protection in medical areas.

Compared to lead, tungsten is much more environmentally friendly and higher density with smaller capacity of the same weight. It usually used to absorb X-ray and gamma ray by making into the collimator, which is a device that filters a stream of rays so that only those traveling parallel to a specified direction are allowed through. According to the use of lenses, it is not yet possible to focus radiation with such short wavelengths into an image as is routine with electromagnetic radiation at optical or near optical wavelengths. In this way, tungsten medical shielding works as collimator is useful in absorbing neutron, X-ray and gamma-ray.

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Tungsten X-ray Detector

Tungsten X-ray detector is high-purity Ge-detector with 23 crystals arranged in a semi-annular array made by tungsten material. The 23 detector crystals are equally spaced in steps of 8.2°, covering azimuthal angles from 0° to 180°. The detectors are in orthogonal pairs, allowing simultaneous measurement of 11 sets of orthogonal q-vector components. Tungsten is hiding in detector to control the direction of energy dispersive. This design is intended to improve the determination of strain tensor components and permits the measurement of crystallographic texture with a single detector set-up. The multi-element arrangement is also an advantage when the average grain size in the sample is comparable with the beam dimension. In this case, reflections can vanish for certain azimuthal angles. Element 23 at 180° is symmetrical to element 1 at 0° and is used for detector alignment.

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Tungsten Poly Properties

Tungsten poly properties are mainly as follows:

High density: ≥11.34 g/cm3

Perfect radiation shielding absorption: Tungsten has comparable radiation shielding ability as lead but is much healthier than lead. To date, many manufacturers, especially those in medical industry, are trying to replace lead radiation shielding products with tungsten poly.

Good machinability: can be cut or holed easily with household scissors and formed into shapes with various curved surfaces.

Environmentally friendly: Tungsten poly is totally different from lead, but it is non-toxic, and is recyclable material having no pollution to the environment.

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Tungsten Poly Radiation Shielding Density

Tungsten poly radiation shielding is a definition for tungsten-polymer composites, working as a new substitutes to lead or tungsten-based heavy alloys. Its composite system has two components: tungsten and polymer, which acts as filler and combines high weight percent of tungsten powder. Tungsten poly radiation shielding density is about 13~14 g/cc. As far as we know, the density of lead is about 10.0 g/cc -10.8 g/cc. The density of tungsten-based heavy alloy is about 16 g/cc to 18.5 g/cc. High density tungsten nylon may vary between 10 g/cc to 14 g/cc. Tungsten poly radiation shielding is most popular, as it is quite different from tungsten heavy alloy material, and there is no need to be sintered, but it is usually made by injection molded, which could shorten the delivery time.

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Polymer Tungsten Shielding Composites

Polymer-tungsten can be applied for X-ray shielding as a reliable substitute material for lead. The lamination order of tungsten film and sendust composite film affects the final performance of the laminated composites.Polymer-tungsten shielding composites had been studied the effects of multilayer structure on X-ray shielding ability. Though the metals were nonleaded, the metal contents were low, and the composite films were thin, the composite films showed favorable X-ray shielding ability due to the uniform dispersion of metal particles in the polymer matrix and the flake alignment of tungsten. This means that multi-layered particles can effectively absorb the penetrating photons and they fill the pin holes in the composite. More uniformly aligned tungsten shows better shielding effect than randomly oriented lead.

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Tungsten Radiation Collimators Classification

There two kinds of tungsten radiation collimators classifications, tungsten panoramic collimators and tungsten directional collimators. Collimators contain and direct the beam of radiation during exposure. This results in improved radiograph quality and safer operating conditions. Tungsten panoramic collimators consist of a stainless steel housing containing two tungsten inserts. Tungsten directional collimators direct the radiation beam from a side port as a 60° conical side throw. A wide range of collimators have been developed to meet the variety of applications and techniques used.

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Gamma Camera Tungsten Parallel Collimator

Gamma camera tungsten parallelcollimator is a thick plate of tungsten riddled with a large number of very thin parallel channels. The gamma rays which can pass through it are those whose direction is perpendicular to the surface of the tungsten plate and the scintillating crystal. The channel axes point towards the body part under examination, and the tungsten stops all gamma photons traveling at an oblique angle. Other collimators can be designed using different techniques: a pinhole collimator is used for thyroid scintigraphy scans, whereas fan-shaped collimators are used for imaging of the brain.

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