Protons can penetrate up to 30 centimeters, reaching deep-seated tumors. But the delivery of protons in a continuous beam limits the dose rates. Also, proton systems are far larger and more expensive than, say, X-ray machines, which will likely constrain their availability to specialized centers.
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阿根廷通讯社等当地媒体援引能源部的消息报道说，该国丘布特省、圣克鲁斯省、门多萨省和内乌肯省等地常规油田石油出口预扣税率将从3.36%提高到8%。