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- From: reza.naima@uttsbbs.uucp (Reza Naima)
- Newsgroups: misc.consumers
- Subject: Are Your Light Bulbs Radi
- Message-ID: <1481.25.uupcb@uttsbbs.uucp>
- Date: 26 Aug 92 09:47:00 GMT
- Reply-To: reza.naima@uttsbbs.uucp (Reza Naima)
- Organization: The Transfer Station BBS, Danville, CA - 510-837-4610/837-5591
- Lines: 58
-
- anderson@SSD.intel.com (Mike Anderson) wrote
-
- MA>Abstract: Alert!!! some compact flourescent light bulbs have
- MA>radioactive
- MA>materials in them.
- [ Stuff cut out ]
- MA>Problem: One of my friends pointed out the message on the back of the
- MA>box:
- MA>
- MA>|Caution: .......
- MA>| .......
- MA>| .......
- MA>|(last line) Starter bottle within lamp base contains 0.33 Micro-Ci
- MA>Pm-147.
- MA>
- MA>I had not read the fine print. I believe this label indicates that
- MA>the
- MA>radioactive element Promethium is being used in some manner. It has
- MA>been
- MA>some time since I had physics so I am bit rusty. I found Pm on my
- MA>periodic
- MA>table at element 61. And my book indicates that this element emits
- MA>GAMMA and
- MA>BETA radiation. It is my recallection that GAMMA radiation is not
- MA>extermely
- MA>desirabled.
- MA>
- MA>Request: Can someone familiar with the properties of Pm please post
- MA>more
-
- I recently purchased a big handbook of chemistry and physics at a
- book-sale for a qarter, and this is what it says regarding Pm
- (The description is long, so I cut out the uninteresting parts)
-
- Searches for the element in nature have been fruitless, nad it now appears
- that promethium is completely missing from the earth's crust. Fourteen
- isotopes of promethium, with atomic masses from 141, to 154, are now
- known. Promethium-147, with a half-life of 2.64 yrs., is the most
- generally useful. (It goes on stating that Promethium-145 edoes not emmit
- gama radiation and some other stuff). Promethium salts luminesce in the
- dark with a pale blue or greenish glow, due to their high radioactivity.
- (blah, blah). The element has applications as a beta source for thickness
- gages, and it can be absorbed by a phosphor to produce light. Light
- produced in this manner can be used for signs or signals that require
- dependable operations; it can be used as a nuclear-powered battery by
- capturing light in photocells wich convert it into electric current. Such
- a battery, using Pm-147, would have a useful life of about 5 years.
- Promethium shows promise as a heat source to provide auxilary power for
- space probes and satellites.
-
- Well, that sure revealed a lot, huh? The book is about 20 years old,
- so there might be more info...
-
- Reza
- reza.naima@uttsbbs.uucp
-
- --- WinQwk 1.10a #0
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