An analogy of your argument: gravity exerts harmless levels of physical force on your body, therefore the government has the right to exert harmless levels of physical force on your body.
By the way, radiation exposure is cumulative throughout your lifetime. There is no safe minimum level of radiation exposure. How much radiation you get on a flight is irrelevant to the topic at hand.
AIUI the "linear no threshold" model of radiation is widely accepted, but not universally accepted. https://en.wikipedia.org/wiki/Linear_no-threshold_model#Cont...
It still doesn't matter; assuming the official values are correct within two orders of magnitude, those scans still get dwarfed by the natural background radiation you are exposed to every day.
Complaining about this, or expecting someone to get consent for such levels of radiation, is ridiculous (yes, there are very important reasons for which one should oppose those scans, but radiation is not one of them). It's just failure of thinking by refusing to do the math. By the same token, why should we allow you to increase risk of heart attack of everyone here by using scary-sounding words like "radiation exposure" in the comments? Stress adds up too.
Please meditate over this handy reference chart: https://xkcd.com/radiation/.
By your reasoning, it would be OK for the police to take a few pennies here and there from large bank accounts.
By my reasoning it's ok for the police to drive around in their cars even though they add up to traffic, which costs a lot of people some pennies lost in gasoline and opportunity cost.
The only reason we're talking about it is because "radiation" sound scary while other things, like "time lost in increased traffic" do not. At the levels of danger we're talking about here we should not be bringing concept of people's rights, lest we want to also regulate disagreeing in Internet comments because of increased heart attack risk from stress.
Radiation doesn't "sound" scary, it is scary. And for very good reason: because at the hands of people who don't understand the dangers, it can be absolutely devastatingly lethal.
Take for instance the irradiation accident in Goiania (Brazil) where a radioactive source was removed from a trashed teletherapy machine by people scavenging for scrap.
This is from the IAEA report on the case:
After the source capsule was ruptured, the remnants of the source assembly were sold for scrap to a junkyard owner. He noticed that the source material glowed blue in the dark. Several persons were fascinated by this and over a period of days friends and relatives came and saw the phenomenon. Fragments of the source the size of rice grains were distributed to several families. Theis proceeded for five days, by which time a number of people were showing gastrointestinal symptoms arising from their exposure to radiation from the source.
(online here: http://www-pub.iaea.org/mtcd/publications/pdf/pub815_web.pdf)
Result, 249 people contaminated, 4 of which died and 28 suffeed radiation burns, plus environmental contamination kilometers away.
That's why people are scared of radiation. Because it can seriously mess you up.
And I fear that going around and saying "it's totally harmless, like eating a banana" is really not helping the people who use it to be really, really careful how they use it. And they should- because if they don't then it's not at all harmless.
Basically, a backscatter van like the ones we discuss here, if left at the hands of people who do not have any training as radiologists (and possibly even then) is, indeed, for all intends and purposes, a chariot of death with an invisible death ray gun.
Tell me what keeps the operators of this sort of van from forgetting the scanner to "ON" pointing at a crowded building and going for a wee, or a coffee, or taking a nap or whatever. People have done much, much more stupid things than that. See above- glow-in-the-dark powder. They thought it was magical fairy dust and daubed it on their babies [edit: actually that was in a very similar accident, in Ciudad Juarez]. 'Nuff said?
As others have said, the effects of radiation are additive, therefore those scans are not "dwarfed" by the natural background radiation etc, they increase it.
Take heat as an analogy. If the background level is at your body temperature and seventy different processes raise it by 1 degree C, you'll boil in your own skin. The background level is safe, each raise is safe, but added up they kill you.
The question is: is this possible with those vans? Is it conceivable that, in some cases, for some people, they may cause a lethal increase in their daily dose of radiation? Is it possible to know this for sure? Uncertain death is even scarier than certain death and for very good reason.
Having a cop stand to either side of me superficially would balance the gravitational force, but unfortunately I'd still be getting violently physically assaulted by tidal forces as my flesh stretches out ever so microscopically toward them both.
I think the opposite is truth: we need to act now while we still have some power, rather than assume a defeatist attitude and let our children and their children at the mercy of a fully omnipotent government.
Then there is the possibility someone walks in between the van and target. At some point you have to stop the argument that this and that does x and y so z is ok. People are afraid of excessive radiation and the government isn't listening to people.
One thing that infuriates me is that people making these arguments don't even know that x-rays (and cats) use ionizing radiation which is what carries real risks. Incidentally, MRIs do not use ionizing radiation so you can stay in there a "while". Thats how they can do so many cool studies using MRIs.
At this point I think this link will beat Meditations on Moloch in the "most often posted in comments by this user" statistic, but once again I'm pointing to this helpful chart: https://xkcd.com/radiation/.
> People are afraid of excessive radiation and the government isn't listening to people.
People are afraid of a lot of things, and at this point I'm not sure how we should deal with it on a social level anymore. They are scared of radiation, therefore allow for lots of unnecessary deaths, destruction of the environment and even more radiation by refusing to replace coal plants with nuclear ones. They're also afraid of vaccines, microwaves and cell-phone EM radiation (how they were never afraid of radio waves in pre-cellphone era is beyond me, but maybe they initially were but got over it).
That people are afraid of things that aren't dangerous doesn't mean we should stop doing that things. As for how to make people not afraid, I don't know anymore. Maybe we should just pay the advertising industry to fix that with propaganda?
(Presumably this was more about the aircrew's cumulative dose than the passengers).
Standing in front of the US capitol building for about an hour is also about 0.1 uSv. Granite is quite radioactive, you know. Some kitchen countertops are much worse.
0.1 uSv is also the generally accepted as the "banana equivalent dose". Bananas are a decent source of potassium, which aside from being an essential element is also somewhat radioactive.
There is no fixed accepted dose rate for flying. More than a couple and less than a dozen uSv/hr is about as accurate as you're gonna get. Depends on flight path and altitude and who knows what all else. The claim that its a couple minutes of flight is not all that far from the truth, more or less.
People who don't really understand what they're afraid of can't rationally minimize risks anyway. Perhaps the granite in a kitchen countertop or architectural decorative feature would increase cancer death rate by 0.0001% but cancer due to chemical catalyst contamination in a replacement laminate countertop MIGHT be ten times the cancer death rate of radioactive granite. Or maybe not.
Assuming they're telling the truth about the dose, I wouldn't worry about the radiation dose. Its small enough to be measured but biologically irrelevant.
What is highly suspicious is a police state violating constitutional amendments probably isn't very concerned with citizen health and probably feels no need to tell the truth. I could see some PR guy claiming its only 1 banana-equivalent-dose or an hour sitting at a granite countertop or whatever because he knows its irrelevant, even if the actual dose is so high that passersby hair is falling out and they're getting radiation burns because its an enormously higher dose. I mean, the government would never lie to us, would they?