Microcontroller Monday is tonight at 7:30PM
Jeff Keyzer
exploration, otherwise known as Microcontroller Monday.
Microcontroller Monday is open to everyone! Come and work on your
electronics project, learn to solder, or just hang out.
Tonight I'll be bringing by a prototype of the Geiger kit I'm working on
for CCC. Bring your Thoriated lantern mantles.
If any of this sounds interesting, consider stopping by tonight.
I plan to be at the space from 7:30 to around 10PM, but that doesn't
mean people can't start hacking earlier or stay later.
- Jeff aka mightyohm
EBo
some americium for another radiation source...
EBo --
Jeff Keyzer
beta/gamma detectors. If anyone has an LND-712 or some other kind of
alpha detector we could try hooking it up to my circuit, the voltages
are similar.
John Dolecek
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Danny Miller
Danny
On 7/18/2011 1:59 PM, John Dolecek wrote:
I've got an old school Geiger counter that seems to be operational but I haven't had a source to test it with. I'll try to bring it by tonight so I can see if it actually works!
John
On Mon, Jul 18, 2011 at 1:54 PM, Jeff Keyzer <je...@mightyohm.com> wrote:
Americium is primarily an alpha-emitter. The tubes I have are beta/gamma detectors. If anyone has an LND-712 or some other kind of alpha detector we could try hooking it up to my circuit, the voltages are similar.
On 7/18/2011 1:43 PM, EBo wrote:
If anyone has some OLD smoke detectors you might be able to scavenge some americium for another radiation source...
EBo --
On Mon, 18 Jul 2011 13:37:43 -0500, Jeff Keyzer wrote:
Tonight at 7:30pm we will hold our weekly evening of microcontroller
exploration, otherwise known as Microcontroller Monday.
Microcontroller Monday is open to everyone! Come and work on your
electronics project, learn to solder, or just hang out.
Tonight I'll be bringing by a prototype of the Geiger kit I'm working
on for CCC. Bring your Thoriated lantern mantles.
If any of this sounds interesting, consider stopping by tonight.
I plan to be at the space from 7:30 to around 10PM, but that doesn't
mean people can't start hacking earlier or stay later.
- Jeff aka mightyohm
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John Dolecek
John Dolecek
EBo
Will you be at the meeting tonight? I would like to kick some ideas
around with you regarding the router.
EBo --
John Dolecek
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Danny Miller
Radioactive thorium gas mantles were partially phased out. Well, Coleman stopped using thorium and went for a yttrium composition ("yttrium"... isn't that a fun name for an element?) , not because of any law though. Consumer liability might have been part of it but the big concern was risk in manufacturing.
And that was true for the Undark radium paint too- as as an alpha emitter, AFAIK there's no way that radiation would penetrate a glass watch face.
But the decay of the primary element is not the only decay. Americium-241 releases an alpha, yes- but the products undergo another 13 decays before creating a nonradioactive element. FIVE of those decays produce beta. But, the first product after americium-241 is a 2.14e6 year half-life, so that effectively blocks the chain.
Radium has 2 beta decay steps before a long half-life kicks in (there's a 22.3 yr half life layover at Pb-210). So, you might detect beta radiation through a watch face. But it's hard to find radium-paint watches nowadays. I remember my dad had one. In the 60's, they switched to promethium-147, but that eventually phased out too.
The glow of radium watches won't be very strong anymore, but it's got nothing to do with the radium decaying, the half-life is over 200 years. The glow is scintillation of zinc sulfide phosphor powder, but the ZnS crystals are damaged by the alpha impacts in the process, gradually consuming its capability to glow but not the radiation.
Danny
Danny Miller
commit to cuts on-site (I fear hasty cutting), these are 16 ft lengths.
Even my van cannot hold 16ft, although I can take out a rear window and
protrude it like 3-4 ft.
CDN is in Pflugerville. The stock guy who knows the 8020 stuff is off
today and tomorrow though.
Danny
EBo
commuting to various design decisions. So it is a thought experiemnt
mostly.
Then I hope to spend an hour beating on the lathe screw again -- now
that both the truck and I are healthy enough that I am not worried...
EBo --
Danny Miller
There were several models of these:
http://www.radmeters4u.com/
The different models detect different types of radiation, with different sensitivities.
They made a crazy number of them back in the day when everyone was digging fallout shelters. Almost got one at a garage sale once, but someone snapped it up ahead of me.
If you have exactly what's in the pic, that's a high-range CD-V715. Sensitive to gamma and high-energy beta.
The manual has a schematic.
http://www.civildefensemuseum.com/cdmuseum2/radkits/scale/index.html
Danny
John Dolecek
EBo
there -- I bought a case of three of these (different detectors) for my
girlfriend a few months back. She uses them to teach basic stuff in
ecology classes. Anyway I could have brought them back with me... If
it looks like I am going back and forth again I might snag them for a
little while...
EBo --
On Mon, 18 Jul 2011 15:00:09 -0500, Danny Miller wrote:
> Sorry, yellow CD meter, not USGS, that's the one I was thinking of.
>
> There were several models of these:
> http://www.radmeters4u.com/
>
> The different models detect different types of radiation, with
> different sensitivities.
>
> They made a crazy number of them back in the day when everyone was
> digging fallout shelters. Almost got one at a garage sale once, but
> someone snapped it up ahead of me.
>
> If you have exactly what's in the pic, that's a high-range CD-V715.
> Sensitive to gamma and high-energy beta.
> The manual has a schematic.
> http://www.civildefensemuseum.com/cdmuseum2/radkits/scale/index.html
>
> Danny
>
> On 7/18/2011 2:19 PM, John Dolecek wrote:
>> I think it's this one:
>>
>>
>>
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Paul Bonser
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Jeff Keyzer
Jeff
On 7/18/2011 4:38 PM, Paul Bonser wrote:
Aw man, looks like I won't be able to make it tonight. Our pipes have decided to spring a leak somewhere in/under/around our foundation, so I've got that to deal with...
On Mon, Jul 18, 2011 at 1:37 PM, Jeff Keyzer <je...@mightyohm.com> wrote:
Tonight at 7:30pm we will hold our weekly evening of microcontroller exploration, otherwise known as Microcontroller Monday.
Microcontroller Monday is open to everyone! Come and work on your electronics project, learn to solder, or just hang out.
Tonight I'll be bringing by a prototype of the Geiger kit I'm working on for CCC. Bring your Thoriated lantern mantles.
If any of this sounds interesting, consider stopping by tonight.
I plan to be at the space from 7:30 to around 10PM, but that doesn't mean people can't start hacking earlier or stay later.
- Jeff aka mightyohm
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Paul Bonser | http://probablyprogramming.com | @pib
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Joe Saunders
I've got the full civil defense kit (sounds like the same thing you got Ebo). 3 detectors I think. One of the detectors has a test source on the handle. Also have a bunch of dosometers and a recharger for them. At one point I had a smoke detector to play with too, but not sure where that is. I am out of town this week but can bring them in next week if anyone is interested.
Joe
On Jul 18, 2011 4:13 PM, "EBo" <e...@sandien.com> wrote:
Wish I would have known yesterday that you wanted to play with some of there -- I bought a case of three of these (different detectors) for my girlfriend a few months back. She uses them to teach basic stuff in ecology classes. Anyway I could have brought them back with me... If it looks like I am going back and forth again I might snag them for a little while...
EBo --
On Mon, 18 Jul 2011 15:00:09 -0500, Danny Miller wrote:
>
> Sorry, yellow CD meter, not USGS, that's the one I was thinking of.
>
> There were several model...
>>
>> I think it's this one:
>>
>>
>>
>> On Mon, Jul 18, 2011 at 2:17 PM, John Dolecek <jdol...@gmail.com <mailto:jdol...@gmail.com>> wr...
>> <dan...@austin.rr.com <mailto:dan...@austin.rr.com>> wrote:
>>
>> Is it a yellow USGS s...
>>>
>>> I've got an old school Geiger counter that seems to be
>>> operational but I h...
>>> <je...@mightyohm.com <mailto:je...@mightyohm.com>> wrote:
<mailto:austin-hacker-space@googlegroups.com>
>>>
>>> Americium is p...
>>>
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Joe Saunders
One of mine even has a remote sensor for checking out what's going on outside your bomb shelter without going outside. Makes me want to build a bomb shelter.
Joe
On Jul 19, 2011 9:55 PM, "Joe Saunders" <laz...@gmail.com> wrote:
I've got the full civil defense kit (sounds like the same thing you got Ebo). 3 detectors I think. One of the detectors has a test source on the handle. Also have a bunch of dosometers and a recharger for them. At one point I had a smoke detector to play with too, but not sure where that is. I am out of town this week but can bring them in next week if anyone is interested.
Joe
>
> On Jul 18, 2011 4:13 PM, "EBo" <e...@sandien.com> wrote:
>
> Wish I would have known yesterday t...
> There were several model...
>>
>> >
>> > Sorry, yellow CD meter, not USGS, that's the one I was thinking of.
>> >
>>>
>>> >>
>>> >> I think it's this one:
>>> >>
>>> >>
>>> >>>> On Mon, Jul 18, 2011 at 2:17 PM, John Dolecek <jdol...@gmail.com <mailto:jdol...@gmail.com>> wr...
>> Is it a yellow USGS s...
>>>
>>> >> <dan...@austin.rr.com <mailto:dan...@austin.rr.com>> wrote:
>>> >>
>>> operational but I h...
>>>>
>>>> >>>
>>>> >>> I've got an old school Geiger counter that seems to be
>>> Americium is p...
>>>>
>>>> >>> <je...@mightyohm.com <mailto:je...@mightyohm.com>> wrote:
>>>> >>>
>>>>
>>>> <mailto:austin-ha...@googlegroups.com>
>>> austin-hacker-space...
>>>>
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Jeff Keyzer
Jeff
David Mitchell
I'm using this article for inspiration, but using pwm on an avr to generate the 125khz signal.
http://forums.parallax.com/showthread.php?105889-World-s-simplest-RFID-reader
Martin Bogomolni
-M
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