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Re: Particle physics 2

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On 6/14/2018 12:52 PM, Sergio wrote:
> On 6/14/2018 11:42 AM, Volney wrote:
>> On 6/14/2018 11:06 AM, Edward Prochak wrote:
>>> On Wednesday, June 13, 2018 at 4:55:59 PM UTC-4, numbernu...@gmail.com
>>> wrote:
>>>> So it is questionable if cosmic rays are actually
>>>> propagating through your body. How do you know if it is background
>>>> radiation. Get background radiation or more like underground radiation.
>>>
>>> A good question. but consider:
>>> if it is background radiation, at 1800 meters, the radiation will come
>>> from all directions because the source is the surrounding rock.
>>>
>>> if it is cosmic radiation (particles), there is a preferred direction
>>> from above.
>>>
>>> when tests are done, there is indeed an excess coming from above.
>>> That excess increases as the testing is done close to the surface.
>>> And even greater excess from above for tests done at higher elevations
>>> (mountain tops).
>>>
>>> This is opposite what would happen if the source is the bedrock.
>>> On the mountain tops the bedrock is below, so the particle direction
>>> would be up not down.
>>>
>>> Since the observations shown the direction coming from above,
>>> then we can rule out background radiation.
>>
>> Yes that is something that confounded early radiation experimenters.
>> They wanted a place with a low background level for more sensitive
>> experiments. They knew rocks contained radioactive elements, so they
>> figured things would work better if they did their work on mountaintops
>> or balloons. To their surprise, the radiation _increased_. And it was
>> coming from above, even to a large extent on the surface of the earth or
>> below ground.
> 
> http://rocketsetc.com/wp-content/uploads/2015/05/hab2-geiger2.png
> 
> https://meteolcd.files.wordpress.com/2015/10/dose_rate_versus_altitude.jpg
> 
> http://www.ansto.gov.au/cs/groups/corporate/documents/stillimage/mdaw/mda5/~edisp/acs017612.jpg

yeah I remember reading how airline pilots and flight attendants (and 
the passengers, of course) receive the equivalent of n dental X-rays of 
radiation on every cross-country flight. This is a bigger problem for 
the airline employees than occasional passengers, of course. I forgot 
what "n" is, or how long it takes sitting on your butt at sea level to 
"get" a dental X-ray.

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Re: Particle physics 2 numbernumber1964@gmail.com - 2018-06-13 13:55 -0700
  Re: Particle physics 2 Edward Prochak <edprochak@gmail.com> - 2018-06-14 08:06 -0700
    Re: Particle physics 2 Volney <volney@volney.invalid> - 2018-06-14 12:42 -0400
      Re: Particle physics 2 Sergio <invalid@invalid.com> - 2018-06-14 11:52 -0500
        Re: Particle physics 2 Volney <volney@volney.invalid> - 2018-06-14 13:04 -0400
          Re: Particle physics 2 Volney <volney@volney.invalid> - 2018-06-14 13:08 -0400
            Re: Particle physics 2 Sergio <invalid@invalid.com> - 2018-06-14 12:40 -0500
              Re: Particle physics 2 benj <benj@nobody.net> - 2018-06-14 16:01 -0400
            Re: Particle physics 2 Edward Prochak <edprochak@gmail.com> - 2018-06-15 05:39 -0700

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