Multi-leaf collimator usually 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 leaves have the capability of moving at speeds of 50 cm/s up to and higher than 1 m/s.

The present invention generally relates to radiation therapy. In various respects, the invention is directed to a highly responsive multi-leaf collimator, and method of use to provide radiation therapy utilizing beam shaping, intensity modulation and combinations thereof including simultaneous beam shaping and intensity modulation of therapeutic beams. Also the most important material for its radiation absorption is tungsten alloy material, which is a kind of high density, excellent machinability and good environmental-friendly. Tungsten alloy material plays a vital role for multi-leaf collimation radiation protection.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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National tungsten concentrate (tungsten trioxide content of 65%) of the total 2015 annual production control target of 91,300 tons, including 73,300 tons of main mining indicators, utilization indicators 18,000 tons. China rare earth ore (rare earth oxides REO) total production control target of 105,000 tons, wherein the ionic (with heavy rare earth-based) index 17,900 tons of rare earth ore, rock type (light) 87,100 tons of rare earth ore index.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Tungsten market: Tungsten City maintenance of stability operation, tungsten concentrate buyers and sellers Quote Quote gap, holding the goods sell mentality strong, spot transactions stalemate, or short-term ore price stabilization, more than 60 degrees or tungsten concentrate mainstream price hovering at 1.02-1.05 yuan / kWh. APT and other downstream smelters currently lower house inquiries increased, but low supply difficult to buy, buyers and sellers on prices continued stalemate.

Molybdenum market: mid-market long overdue good news, continued price's decline against participants repeatedly confidence, positive business transactions decreased. With the bears increased in some areas began to cut prices to sell.

Tungsten City maintenance of stability operation, tungsten concentrate buyers and sellers Quote Quote gap, spot transactions stalemate, or short-term ore price stabilization, the mainstream price of tungsten concentrates above 60 degrees or hovering 1.02-1.05 yuan / kWh.

Macro level, the central bank: in April last month, less social increment financing; major economic data released in April, economic downward pressure is still large; EU PV China again launched "anti-circumvention investigation."


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Tungsten market: low tungsten ore exploratory inquiries increased, but the price is now holding cargo ship did not profit at all, more sellers, spot market transactions stalemate, expected in May or tungsten ore spot trading conditions difficult to have a significant breakthrough. APT and other smelters lower house inquiries increased, but low supply difficult to buy, buyers and sellers on prices continued stalemate. Ferro-tungsten market has remained relatively strong, a very small price declines, remained relatively stable.

Although tungsten end demand continues to slump, but the grocers sell mentality thick, spot market transactions scarce, ore prices temporarily stabilized stabilized, it is understood 55-60 degrees scheelite temporarily strong near 1.02 yuan / kwh. May tungsten ore market or steady consolidation-based, price volatility is not, spot transactions stalemate, and other guidance issued after June, the market outlook is more clear, tungsten business operations or increased slightly.

APT and other downstream smelters currently lower house inquiries increased, but low supply difficult to buy, buyers and sellers on prices continued stalemate. At present, many businesses tungsten ore sidelines waiting, hopeful on June tungsten market, there miner revealed now take only a small point of shipment cash wages, and mostly for old customers.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Tungsten low exploratory inquiries increased, but the price is now holding cargo ship did not profit at all, more sellers, spot market transactions stalemate, expected in May or tungsten ore spot trading conditions difficult to have a significant breakthrough.

Macro, replacement trillion local government debt is expected to start, experts recommend private placement mainly; and Russia signed 32 cooperation worth $ 25 billion, a number of companies to benefit; the central bank open market operations and then paused.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Clean County Sanming introduce dual German mining investment tungsten waste rock recycling project re-election, using a spiral concentrator, shaking flotation beneficiation and desulfurization equipment and other advanced technology, selected content more than 50% of tungsten concentrate. The project is to encourage and support "for the large solid waste disposal" project, plans a total investment of 500 million yuan, an annual investment of 300 million yuan, after the completion, Tungsten waste rock per day 3,000 tons, annual output will reach 500 million yuan, driven more than 300 jobs; at the same time, two German mining will complete construction of an annual output of 80 million green brick production line, to slag be reproduced, turning waste into treasure. At present, the project has completed an investment of 150 million yuan, the plant infrastructure, aqueducts, building and other construction is rapidly advancing, expected in the second quarter suffrage production line can be completed in production.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Tungsten market: Overseas tungsten market steady, demand is deserted; continued weak domestic demand for tungsten end, the recent market weakness tungsten steady, manufacturers offer cautious, no significant improvement in market demand, continuing weakness in downstream demand, prices continued to show a turnover of tungsten slow downward trend, the market waiting to see atmosphere. Paratungstate price weakness steady, mainstream offer 127,000 yuan / ton, the actual transaction price of about 125,000 yuan / ton, the market volume is low, short-term ammonium paratungstate or continue shock consolidation, but does not rule out the possibility of slightly lower.

Overseas tungsten prices steady, demand is deserted, or short-term price volatility is not overseas tungsten; tungsten end domestic demand remained weak, tungsten transaction prices continued to show a slow downward trend.

Macro, provident fund interest rates at historic lows, over one hundred city housing fund deregulation; April inability to reduce downward pressure on the economy, the second round of local government debt replacement or planned; the Bank of England kept its benchmark interest rate unchanged at 0.5%.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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