One safety catch in his design is its helium coolant.

这次设计中采用的一个安全措施就是使用氦冷却剂。

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Spitzer's liquid helium coolant ran out in May 2009, so this false color view is from two channels that still remain sensitive to infrared light at warmer operating temperatures.

斯皮策的液态氦冷却剂在2009年5月用完了，所以这张假彩色图像来自在目前较温暖的操作温度下对红外光仍然敏感的两个波道。

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The pebble has about a one millimetre microsphere diameter. The coolant is in fact helium.

卵石大约有1毫米的球径，冷却剂就是氦气。

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The reactor also lacks a back-up mechanism to stop it overheating and exploding should the helium coolant escape.

ECONOMIST: Prospects for a new type of nuclear reactor look mixed