- suggestions for setting up a dosimeter charging system - 7 Updates
- solution manual - 2 Updates
- Difference between Sony Vaio PCG-71312L and PCG-71312M. - 1 Update
| Jeff Layman <jmlayman@invalid.invalid>: Jan 17 05:00PM On 17/01/2022 14:34, Juan S wrote: > to see one in the used marker. How would you go about modifying an > existing charger so no battery would be needed? > Thanks in advance for your help. Totally off-the-wall suggestion. Is there any way that a piezoelectric gas lighter could be used or modified to charge the dosimeter? No batteries required and only a dollar or two to buy. -- Jeff |
| "Peter W." <peterwieck33@gmail.com>: Jan 17 09:37AM -0800 > Totally off-the-wall suggestion. Is there any way that a piezoelectric > gas lighter could be used or modified to charge the dosimeter? No > batteries required and only a dollar or two to buy. With that in mind, how about one of those anti-static devices for records? https://www.amazon.com/Zerostat-Anti-Static-Instrument/dp/B074XLBNDD Bit pricey, however. Peter Wieck Melrose Park, PA |
| Juan S <none@anytime.net>: Jan 17 03:32PM -0500 On 1/17/22 10:50 AM, Peter W. wrote: > If you want to make the charger stationary, it is simply a matter of delivering the proper DC voltage - which I dimly remember is supplied by one D-sized cell in the container. And as these were based on conventional Leclanche cells, that would be 1.56 volts DC. That should not be too difficult. But, of course, you would need some power from some source. That, sadly, is the nature of those beasts. > Peter Wieck > Melrose Park, PA No, I'm trying to get away from having to use the battery. Something like a crank generator. The original Bendix model from the 50's had such a generator built in. It is 1.5VDC, yes and a single D cell. |
| Juan S <none@anytime.net>: Jan 17 03:36PM -0500 On 1/17/22 12:37 PM, Peter W. wrote: > Bit pricey, however. > Peter Wieck > Melrose Park, PA I believe my hand trigger charger has such an element in it. It's not like a lighter that has an instant trigger mechanism, but more like the Zerostat unit, so a gradual charging, depending on how fast or slow the trigger is pulled. I wish such a piezo element was available as a part somewhere, but I have been unable to locate one. When I was a kid, I actually had a unit like the Zerostat that my dad picked up for me at a surplus place. It must have been thrown out years ago because I haven't see it since adulthood. |
| Chris Jones <lugnut808@spam.yahoo.com>: Jan 18 04:36PM +1100 On 18/01/2022 01:34, Juan S wrote: > to see one in the used marker. How would you go about modifying an > existing charger so no battery would be needed? > Thanks in advance for your help. I don't have a suggestion, but I am curious - what use has your relative found for the dosimeters? I have one without a charger, but it was charged when I received it and has barely discharged in the many years that I have owned it, and I hope it never will (or not when I am near it anyway!) Its full-scale reading is a fairly decent fraction of a lethal dose IIRC. |
| Juan S <none@anytime.net>: Jan 18 08:54AM -0500 On 1/18/22 12:36 AM, Chris Jones wrote: > that I have owned it, and I hope it never will (or not when I am near it > anyway!) Its full-scale reading is a fairly decent fraction of a lethal > dose IIRC. It's ok, I've been asked that before. Well, with things being what they are in the world lately, I've been trying to set up not only myself, but a relative or two as well with some radiation monitoring systems. The idea with the pens and chargers is that, in the awful event a large scale nuclear event occurs, that we might increase our chances of survival. As I write I doubt that our odds would be that get to even get to the point of monitoring (we are all within 50 miles of major cities and military bases), but just as a precaution. I have seen all of this CD equipment for years and decided to go with a bunch of the pens and chargers in a trade. Something high level is definitely needed because most "geiger counters" would be useless after such an event. We all have geiger counters, but I doubt any of them would even survive an EMP. I have some low range pens as well, only up to the 200 mR range that might come in handy for less severe events, such as atomic plant incidents. Oh well, these are just some ideas and precautions that have cost next to nothing to try implementing. I don't really trust that batteries would be all that reliable after a crisis, which was why I was looking for a non-powered way to allow the 1.5V chargers to still work. |
| "Peter W." <peterwieck33@gmail.com>: Jan 18 06:54AM -0800 OK - Let us address each concern in turn: Battery reliability: Solar cells come immediately to mind. It would not take many, and you could set up for the current you need. Install with a rechargeable, and you are all set. EMP: Those little CD Geiger counters are both incredibly simple and designed for survival. The mil-spec. ones are even better that way. A larger concern would be whether the counter could give you meaningful readings for Alpha and Beta particles - mostly harmful only if the producing materials were ingested or inhaled. Gamma radiation can be detected in any number of simple ways, no batteries needed. https://www.google.com/search?q=electroscope&oq=electroscope&aqs=chrome..69i57j0i512l9.5040j0j7&sourceid=chrome&ie=UTF-8 Note that Plutonium is primarily an Alpha emitter - and the basis for most nuclear weapons these days. Dosimeters: Those dosimeters will be useful only if you *know* there is a danger, and therefore pay attention to them, not so much that they indicate (they will), but the period of time it takes them to indicate. Note that they are useless for Alpha and Beta particles, as they are too well shielded. A piece of heavy aluminum foil is sufficient shielding for either - but for the inhalation issue. 50 miles of an 'target': That would apply to most of us. And if one is within several hundred miles, but east of a detonation, the radioactive products will catch up to you in any case, unless you choose to not breathe. Survival: No modern medication, including statins, blood pressure medicine, epi-pens, antibiotics, vaccinations, nor any other infrastructure-dependent materials after the immediately existing supply is used up. Note that these materials have a relatively short shelf-life, so stockpiling is impractical. Then it gets down to supermarkets, transportation, human predators and the other wonders associated with a collapsed civilization. If your survival is based on a FBO, you will be subject to siege - and that is 100% a losing battle, 100% of the time. History has proven that over and over. And if you are nomads, fuel (vehicles) or food (animals) become a serious issue. As well as being highly visible and high-value targets. Best to work towards preventing Armageddon, rather than preparing for it. Spend that energy on something more joyful than the collapse of civilization. Nuclear Plant Accidents: See electroscope above. If there is enough ionizing radiation released to do you harm, that little device will indicate pretty much instantly. Meaning that you will have to 'get out' along with everyone else, and have somewhere to go. At which point, only a Chernobyl-level event is any real threat outside of that 'magic' 10-mile perimeter, or 20 miles +/- downwind. NOTE: We keep a mil.-spec. Geiger counter, as in the past, my wife was fond of Fiesta Ware, some colors of which are radioactive. Not so as to be harmful, but one does not wish to eat from them. And before the hospital I work beside closed down in 2019, the radiation-safety people wore dosimeters routinely as they worked around radioactive materials used for cancer treatments. Peter Wieck Melrose Park, PA |
| School Public Health <mubabol.publichealth@gmail.com>: Jan 17 09:42PM -0800 Dear friends, may I ask for the soft copy of Solution manual Principles of Environmental Engineering and Science (3rd Ed., Mackenzie Davis & Susan Masten) |
| Adrian Caspersz <email@here.invalid>: Jan 18 10:16AM On 18/01/2022 05:42, School Public Health wrote: > Dear friends, may I ask for the soft copy of Solution manual Principles of Environmental Engineering and Science (3rd Ed., Mackenzie Davis & Susan Masten) Great engineers never got anywhere by cheating ... Work it out! -- Adrian C |
| peter@easthope.ca: Jan 17 09:56PM Hi, I want to find replacements for the keyboard and HDD caddy (tray) in a Vaio PCG-71312L. eBay lists a caddy for a PCG-71312M. Can anyone tell me how models PCG-71312L and PCG-71312M differ? Same keyboard and caddy in the two? Thx, ... P. |
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