What is the point of citation (3)?
You focus on absolute readings, whereas hourly rates might be more accessible to the audience since the audience is used to thinking in terms of flying hours. Do you fully understand what citation (1) is telling you when it refers to photons?
Deeper comparisons with routine exposure and safety limits set by other industries might give more perspective; for example average and allowable exposures for medical staff. You might also compare with living in, say, Colorado.