I'm of 2 minds. Largely the evidence basis for the validity of the LNT model is... questionable. There's enough data to show there's likely some lower level of background radiation where there IS a threshold. But where exactly that is? We can't say.
By the way, keep in mind that the average natural background radiation in the US is twice what you (going by your username) have in the Netherlands, and combined with the average medical exposure here, it is approximately 4x your natural background. And the study population size (required for given p-value) increases inversely proportionally to effect squared.
The population sample sizes required for establishing LNT's correctness for additional doses (over natural+medical) in the US, are thus about 16x smaller than what is required for establishing LNT for doses over natural background alone in the Netherlands.
edit: then also of course it's not equal across the US either; having LNT in Denver (due to high background) but hormesis in Houston, but oh wait maybe no hormesis in Houston either because suppose we find that sunburns add to the "total" over which the dose response acts, that would be a regulatory nightmare.
And the only way to find out is a lengthy and ethically questionable process. The aftermath of Fukushima might be the most well documented incident we'll be able to use for research into low level exposure, but even there sorting primary from secondary effects and cause from correlation will be extremely difficult. Thus we should probably keep to using the LNT model. Even if we know it isn't perfect for very low dosage.
There was an accident in Taiwan that provided very good data for low level exposure.
A short backstory. A large Co-60 source was scrapped and ended up contaminating a huge quantity of rebar. That rebar was used to build homes, schools, etc in Taipei.
A number of people, many of them young adults and children, were chronically exposed to varying doses of gamma radiation. The government tried
everything (except protecting the people). They tried not telling anyone. The first time radiation was detected, they tried blaming a dentist.
Finally, they did a study that found
97% lower cancer rates in the exposed population, comparing to the general population's average. A true cure for cancer - instead of putting Co-60 into radiotherapy machines, you need to simply mix it into rebar. Worthy of Nobel prize if true.
This is the kind of shit that we'll have in the US if MAGA goes nuclear.
Every self-respecting hormesis pseudoscientist (e.g. this MAGA-aligned Breakthrough Institute's whitepaper) will mention Taiwanese rebar to support their point, but will never mention
a follow up study, conducted decades later, found increased cancer rates in the exposed population, relatively to
age matched controls.
Honestly, "hormesis" is better understood in the historical context, alongside e.g. telling radium dial painters to lick their brushes and telling them that it is healthy and good for them. Discussions of alternatives to LNT always neglect the social and historical context - sexism, worker rights, businesses killing their employees, etc etc. Focusing on physics or biology of it misses the actual cause of hormesis, which is social rather than biological.
edit: also, without historical perspective, it is hard to comprehend the actual proposition made by these breakthrough people.
It is not that there exists some threshold of exposure, and for people living below that threshold, small additional exposure is harmless. That proposition wouldn't be of much use for regulation, until you establish what is the threshold, which combination of pollutants it should apply to, what fraction of the population lives how far below threshold, how the threshold varies between individuals, etc. Do children have a threshold? Do embryos? Do germline cells?
It is simply a modern version of what management told the radium dial painters. It is simply that a "small" additional dose is harmless or maybe even good for you. It doesn't matter what the existing dose is, you can always use more. No matter how many times you licked the radium brush, one more lick is harmless. You'll never prove that one lick of a radium brush is harmful. It may be good for you, some studies show. So just lick it one more time.
This is the Hormesis Hypothesis. Any attempt to discuss the science of dose response sane-washes the absolute fucking load of motivated horseshit that it is.
There's some overlap with a traditionally Observatory-rather-than-soapbox topic, but I consider this to be a largely Soapbox matter, since this all originates from a purely political move (Trump's executive order).