But there is no hard evidence proving that low dose radiation, below 100 millisieverts, is likely to cause cancer.
但没有确实的证据证明少量辐射，低于100毫西韦特，会导致癌症。
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Yet, each year millions of Americans strive for that perfect tan and even spend their hard earned money to purposefully expose themselves to artificial sources of ultraviolet radiation.
Peregrine Semiconductor Corp., released a new PE9309 UltraCMOS Prescaler for radiation-hardened (rad-hard) space/satellite, high-performance military and hi-rel commercial infrastructure applications.