2 scans a day for 1 year would be 4,380 µSv, or 4.3 mSv. The yearly dose limits recommended by the International Commission on Radiological Protection (ICRP) is 1 mSv per year for the general public, and 20 mSv for “occupationally exposed workers” [1]. Since Assange is receiving this for very specific reasons, I don’t think he would fall into the general public. So he is receiving less than a quarter of what is considered max safe for a radiation worker. For further comparison, long haul airline pilots receive and average of 2.94 mSv/year [2] and “diagnostic radiology, nuclear medicine, and radiotherapy workers were found to be 0.66, 1.56, and 0.28 mSv, respectively” [3]. So he could be on the high end when compared to medical workers and pilots, while still being well under the safe max limits.

[1] https://radiopaedia.org/articles/dose-limits?lang=us

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5019040/

[3] https://www.sciencedirect.com/science/article/pii/S165836551...

Pilots get a lot of radiation exposure though! It's not to be casually dismissed.

12 µSv in two 500 ms bursts is very different 12 µSv spread out over 1 hour of flight time.

The difference in intensity is 3,600 fold. It's the difference between being subjected to 1 hour of 30 degree celcius heat and 1 second of 108,000 degree celcius heat.