# How many neutrinos pass through our body every second?

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Apr 24, 2016

About $600$ trillion

#### Explanation:

Approximately $6.33 \cdot {10}^{14}$ neutrinos pass through $1 {m}^{2}$ per second from a source $1 A U$ (astronomical unit) away

The average adult human body has a surface area between $1.6$ and $1.9 {m}^{2}$, generally greater in males than females. We can take the average as $1.75 {m}^{2}$.

However, not all of the body is exposed directly to the sun. We can approximate that about half of it is face-on, which is $0.88 {m}^{2}$.

Putting these numbers into a calculation

(6.33*10^14"neu"/(m^2s))*0.88m^2=5.57*10^14"neu"/s

This is a very rough guess, but based on this I'd say between around $600$ trillion neutrinos per second pass through us.

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