English (auto-generated)
hey everyone a very generous viewer sent
me this detector on
dg2 Geiger counter
and I decided to
take it apart tonight
and see how it was
doing so this Geiger
counter was
originally a battery powered
it was portable and
it was powered by
two of these B
batteries at 45 volts
apiece and two D
cells at you know one
and a half volts
apiece so since I don't
have any B batteries
what I'm doing is
using this high
voltage supply to feed
it it's high voltage
and this will be
making appearances
in future videos as
well this is an
electrophoresis power
supply that claims
it can do six
kilovolts at 100
milliamps that's a lot
of power at high
voltage so we're gonna
be hooking this up
to some capacitor
banks and see what
we can do with that
later well the
really cool thing is that
you can set current
power and voltage
and if you put it on
it's set mode you
can put different
values in for each of
the limits and then
it will select which
limit is being hit
so you can actually
configure this to do
quite a lot of
things the only
downside is that it has
a lot of safeties in
its output and so
it requires a load
to be connected
before it will start
the power and if
something weird
happens like if you have
more voltage going
in and it's supplying
it shuts down and
all kinds of stupid
stuff but in any
case to power the
Geiger counter I've
got a 1 Meg resistor
just to get past
some of that and its
output is not very
clean so I'm feeding
it through an RC
network into the Geiger
counter and
currently it's only using 2
point 2 milliamps
and currently it looks
like what I've got
here is a bad two so
I've got a
strontium-90 source on the
end of this stick I
actually don't have
a pure gamma source
so I'm just using
this strontium 90
which is a beta
emitter and if I put
it right near the
two can kind of tap
on it nothing's
happening
now I'll swear that
I've had this
actually work with
its existing tube if
I kind of tap on it
just right but it
really doesn't seem
to be doing much
so to test it I've
hooked up another
Geiger to this one I
borrowed from
mighty ohms Geiger
counter and now you
can see it's
actually working just fine
so if I even get
within a few inches
it's almost topping
the scale at 0.2
millirads per hour
so the device has
three tubes total to
up here and one here
and I believe this
lower two in
conjunction with this coil
this is not a
transformer that actually
just a coil forms
the high voltage
generation circuit
for this and there's
a neon light here
which functions as a
you know kind of a
voltage controlled
switch there
presumably the voltage is
stored in these two
caps and the tube
operates at about
270 volts so the way
these Geiger tubes
work is it's
basically just a
center conductor with
some very low
pressure gas in here and
when a gamma wave
enters the tube it
ionized is one of
the gas molecules and
provides a way for charge
to leak from
one electrode to the
next so the more
radioactive waves
and particles you have
going on in there
the more ionization
you'll have and the
more current will
flow between the two
electrodes so it's
actually very simple
in principle the
device has three
different scales on the
front and what it's
doing is its
selecting in one of
these three
precision capacitors
up here these are
mica mica layer
capacitors and for the
gauge readout
there's a very large cap
here that integrates
the signal so
between these two
vacuum tubes on the
top I imagine
there's a fairly sensitive
amplifier and
amplifies those current
pulses from the tube
into something that
can be read out it
also has a headphone
jack a headphone
jack over here
so overall pretty
cool piece of kit and
still working after
you know 60 or 70
years or whatever
it's been that except
for the tube itself
and even that I kind
of like I say I've
swear I've seen that
thing working but I
think the electrode
might have jiggled
news so it
occasionally shorts
out or something
like that okay see
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