Tungsten Alloy Leaf for Gamma Ray Shielding

As the high density and excellent radiation absorption for radiation, tungsten alloy leaf is widely used for medical radiation protection, such as gamma ray shielding, etc.

Compared to pure tungsten, tungsten alloy material is not so brittle, and could be machined into various shapes as per client’s drawing requirement. Therefore, it could be easily machined as per the beam stopper demand, which including simultaneous beam shaping and intensity modulation of therapeutic beams. To stop the gamma ray better, tungsten alloy usually is made into leaf shape as the following picture, also it could be machined into the size as L2000mm max. xW600mm max. xT0.02mm min. , and the components are usually 90WNiFe, 90WNiCu, 93WNiFe, 95WNiFe, 95WNiCu, 97WNiFe, for more information, you could visit the website tungsten alloy radiation shielding, and also could e-mail to sales@chinatungsten.com.

Tungsten Alloy Invention to Multi-Leaf Collimator

As the properties such as high density and environmental-friendly, tungsten alloy material is usually used to invent a new type of multi-leaf collimator for radiation protection.

Embodiments of the present invention provide a multi leaf collimator (MLC). These embodiments have a plurality of leaves having a length of travel. Each leaf has a proximal end, a distal end, a radio opaque distal blocking portion having a length L and width W, a proximal drive portion having a length L′ and width W′, one or more conductive coils fixed to the proximal drive portion and operatively connected to an electrical current source, where electrical current passing through the conductive coils generates a first magnetic field. The MLC of these embodiments also have a leaf guide with a plurality of channels arranged approximately parallel and adjacent to each other where at least a portion of each of the plurality of leaves is slidingly arranged into each of said channels, and a plurality of stationary magnets positioned adjacent to the proximal drive portion, where each stationary magnet has a second magnetic field configured to operate in conjunction with the first magnetic field from the coils to exert a force on the proximal drive portion. For the high density, we could reduce the size and the volume for the collimator with tungsten alloy material but having the same radiation absorption before. 

What is multi-leaf collimator?

Multi-leaf collimator includes a plurality of leaves, a leaf guide configured to support the plurality of leaves, and a plurality of magnets. Each leaf includes a blocking portion that is radio opaque, a drive portion connected to the blocking portion, and a coil embedded in the drive portion. The coil is operatively connected to an electrical current source to generate a first magnetic field. The first magnetic field interacts with the magnetic field generated by the magnet to thereby move the leave to a desired state. The leaves have the capability of moving at speeds of 50 cm/s up to and higher than 1 m/s.

Tungsten alloy material shows as a very suitable choice for multi-leaf collimator radiation protection. The present invention shows that the higher responsive to radiation could be acquired through tungsten alloy multi-leaf collimator.