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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: Quantum mystics
Date: Tue, 11 Jun 2024 12:06:05 +0100
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On 10/06/2024 22:24, john larkin wrote:
> On Mon, 10 Jun 2024 23:15:51 +0200, Jeroen Belleman
> <jeroen@nospam.please> wrote:

>> I do not expect the probability of a detection event in one spot to
>> be affected instantly by a detection event somewhere else. The
>> collapse of the wave function is an attempt to apply statistical
>> reasoning to a single event.
>>
>> Jeroen Belleman
> 
> Higher energy photons, like gamma rays, can be detected with 100%
> probability. They pack a lot of energy.

No they can't. It isn't called penetrating radiation for nothing. Most 
of it goes straight through all but the densest of targets. The odd one 
gets lucky and hits something and then we see scintillation.

Some of the solid state NaI(Tl) detectors are getting pretty close to 
100% for some energy ranges but the majority are around 50% at best. Big 
step up from the old GM tube counters 0.1-1% though.

Likewise higher energy X-rays goes straight through most matter like it 
wasn't there. You are always playing a numbers game of detections being 
a fraction of the flux passing through (unless the target is optically 
dense) which Earth's atmosphere is for most ionising radiation.

Ultra high energy cosmic ray particles generate an airshower of less 
energetic secondary particles most of which wouldn't reach the ground 
except for the effects of relativity. Some of them have been estimated 
from the total yield to be carrying as much energy as a cricket ball. 
Not bad for a single Fe56 nucleus!

Ground based detectors can measure the secondaries, timings and spatial 
distribution and make a reasonable guess about the energy it had.

-- 
Martin Brown