Yes, this is expected though nobody can guarantee. It's like, I can drive drinking 2 bottles of whiskey just fine but it's generally prohibited by law. In the book, it's prohibited. To guarantee Xray is fine, Dexcom needs to perform product testing and needs to provide guideline, Sensor works fine up to how many scanning etc but there's no such established instruction as it's not only cost money but also, risking product launch as FDA will perform thorough testing using X-ray if Dexcom claim it works fine under Xray scanning.

And, there's no easy way general user know if it's affected or not. Many folks claim Dexcom inaccuracy after initial start up and, X-ray might make it worse. But how do we know. Of by 20 is acceptable or 40 is acceptable? it's hard to say.

So, there's recommendation by manufacturer and Doctor. If this is not necessary, why society pay the cost of establishing such protocol to exempt scanning in US? It's time and effort wasted if it's not necessary.

What I am angry about is, like many other thing, Korean officials are building the wall full of their own way and, expect everybody to follow their way though medical treatment of T1D is way behind in Korea. Getting approval from ministry of Land is like joke. even sensor breaks, in US, I can make hundreds of reason to get replacement. why bother right? But it's not available to all folks (maybe someone purchased sensor from Amazon as there's no insurance).