On the radiation shielding effect of Heavy Alloy, we examined a comparative evaluation with lead. Fig.1 shows the attenuation 

rate of γ-ray (Co60) against the change in thickness of Heavy Alloy and lead. The γ-ray (Co60) used for the evaluation this time is that eradiated from relatively a high energy zone, which becomes an issue in the case of nuclear power station. 

This evaluation proves that Heavy Alloy of about 3mm or 7mm thickness has the radiation shielding effect equivalent to lead 

of about 4.5mm or 10mm thickness respectively. Consequently,

 

Heavy Alloy, compared with lead, has 1.5 times shielding effect against γ-ray (Co60).

 

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Heavy Alloy is a tungsten-group sintered alloy consisting tungsten and binder phase with nickel, copper, iron, etc.

 

Typical material characteristics of Heavy Alloy are following.

▪ High density 

▪ Excellent radiation shielding effect 

▪ Superior machinability to tungsten 

▪ High mechanical strength 

▪ Low thermal expansion and high thermal conductance 

▪ Excellent oxidation resistance 

 

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The density of tungsten is 60 percent higher than that of lead. That is why even thinner layers of tungsten are able to provide 

reliable shielding against radiation. 

 

Tungsten is particularly suitable as a shielding material. It consists of tungsten and a small proportion of nickel-iron. Like 

tungsten, the material has excellent shielding properties. 

 

However, it is also considerably more ductile than tungsten and can therefore be machined better.

 

Thanks to the ductility and high melting point of the material, isotope containers made from tungsten are also able to withstand 

extreme mechanical and thermal loads.Because of their high strength, tungsten components act as both the support structure 

and the shielding in one. Unlike when lead is used, no additional steel support structures are required.

 

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The tungsten alloy reliably shields against X-rays and gamma radiation. With its new production process and great expertise in 

 

the materials field, PLANSEE has made the manufacture of shielding components particularly cost-effective.

 

Whether in the world of medical or industrial X-ray technology, radiotherapy or nuclear power stations: Wherever high-energy 

radiation is used, it is vital to protect people against it.The denser the material, the better able it is to protect from 

radiation. That is why heavy elements absorb X-rays and gamma radiation particularly well. Lead is still the most frequently 

used shielding material. Because it is a very soft material, it is mostly used only in combination with support structures made 

of steel.

 

Lead is a toxic material that is harmful to the environment and humans. The onerous recycling process makes lead expensive 

despite the low initial procurement costs. Many enterprises are therefore looking for a suitable alternative for providing reliable radiation protection.

 

 

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Use not subject to NRC, EPA, or special OSHA regulations

High radiation absorption (superior to lead)

Low toxicity-safer than lead or depleted uranium: simplified life cycle 

Easily machined into complex geometries

Hardness, strength, and ductility make for good durability

Good corrosion resistance

 

 

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Tungsten alloy is ideal for shielding against X rays and gamma radiation. The very high density of tungsten shielding allows a reduction in the physical size of shielding components, without compromising their rigidity or the effectiveness of the shielding characteristics.

Tungsten heavy alloy shielding is used in applications such as Radioactive source containers, Gamma radiography shields, Shielding block, X-ray collimators, Nuclear shielding wall etc.

 

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Radiotherapy destroys cancer by directing beams of radiation directly onto the tumour. The beams of radiation require a very fine focus to avoid harming the surrounding healthy tissue. This focus is achieved by using a multi-leaf collimator , consisting of two rows of very thin tungsten alloy plates, which can be configured to exactly match the dimensions of the tumour.

Dimensions:

Balls: 2mm above

Shafts2mm aboveLength max.600mm）

SheetsThickness 0.15mm aboveWideness max.200mmLength max.500mm）

Square, round and rectangle sizes: diameter 550mm above

According the demanding

 

 

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Positron emission tomography (PET) is one of the nuclear medicine techniques available for diagnosis. Whilst X-rays provide information on the structure of the body, PET shows the chemical function of a particular organism. PET involves the injection of FDG (a glucose-based radionuclide) from a shielded syringe into the patient. As the FDG travels through the patient’s body it emits gamma radiation which is detected by a gamma camera, from which the chemical activity within cells and organs can be seen. Any abnormal chemical activity may be a sign that tumours are present.

PET scans are frequently used to detect cancerous tumours and diseases of the brain and coronary arteries.

Applications for tungsten alloy shielding in PET include:

 

PET syringe shield

Tungsten vial shield

Tungsten FDG transport container

Collimator for gamma camera

Technetium generator

 

 

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