To harmless solar neutrinos

It seemed curious to evaluate how many people are killed annually by sunny neutrino. After all, the interaction of these particles with the substance, although negligible, but not zero, thanks to which they are grabbed by the beard (C). Neutrino, scattering on an electron or atomic nucleus in the environment (for example, in living fabric), give them energy, quite sufficient for ionization from thousands to millions of atoms. Ionizing radiation, at least very weak, creates a certain probability of receiving lethal cancer. Moreover, according to the so -called uninocrated concept, this probability is proportional to the radiation dose, even at very small doses.

So, let's start by assessing the dose power created by the stream of solar neutrino. It was done in work [1]. The power of the equivalent dose for a well-known (calculated and measured) flow and spectrum of solar neutrinos is equal to 10-7 microsiver per year. A little more than half of this dose occurs due to the scattering of proton-proton neutrinos on electrons, while the other half is due to boron neutrinos-both by scattering on electrons, and coherent scattering on nuclear nuclear nuclei, approximately equal shares. Proton-proton neutrinos have low energy (a maximum of 0.42 MeV), but there are many of them (60 billion through a square centimeter per second), and boric neutrinos are highly energy (up to 15 MeV), but their flow is 10,000 times less.

A dose of 1 ZIVERT (ZV) is, roughly speaking, the lower boundary of a radiation disease (with one -time irradiation of the whole body), as well as a border that separates deterministic and stochastic effects of irradiation. In other words, at a dose above Zivert, the future of any victim is very definitely: acute radial inevitable, with all accompanying symptoms. But at small doses, Stochasty reigns-someone is lucky, and someone will earn a crustacean-s, and who is this unfortunate, it is impossible to predict in advance. But this for one person ahead is continuous uncertainty, and if you take a million people and give it to a millisiver, then the number of victims is easily predictable: the risk coefficient is operated by the International Commission on Radiation Protection is 5.5x10-2 ZV-1, that is, from this million deaths threaten an average of 55 people (a work of risk coefficients received by everyone These people and equal to 1000 ZV).

Let's get back to our neutrino. Every person 24 hours a day is 7 days a week, without interruptions, weekends and vacations, is irradiated by these particles, but the effect, as we have seen, is a discouragingly small - only 1013 plots per year. The population of the Earth is rudely, 1010 people, which leads to universal dose power of only about 1 million winter a year. Multiplying it by the above-mentioned death risk, we find that over the year, all united humanity will lose only 5.5x10-5 of a person’s digger .

It is believed that since Adam and Eve, 200 billion Homo sapiens (not sure of this demographic assessment was born, but I met it quite often). Having allowed, taking into account the bruce and unsanitary conditions that reigned in the caves, that the average life of life was 25 years, we get 5 trillion of man-years. This means that the total dose from the solar neutrino, which is aggravated by people, starting from the Paleolithic until tonight, is equal to only half of the ZIEVERT. And therefore, the probability that at least one of those who had ever lived did not die from a banal blow with a stone ax or from a launched runny nose, but decorously and blessedly died of cancer caused by a neutrino born in the bowels of the sun is only three percent.

And this assessment is most likely overestimated, since 1) the uninocrated concept is too rough (albeit conservative) model and 2) the calculation of the dose power from solar neutrino does not take into account the oscillations (the transformation of electronic neutrinos into muon and tau), which reduces their cross -section of dispersion on electrons.

1. Cossart JD, et al. Assessment of Dose Equivalent Due to Neutrinos // Health Phys. 1997. (73) 894.