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- From: jmc@SAIL.Stanford.EDU (John McCarthy)
- Subject: Re: Radioactivity and Superstition; was: Re: Are Your Light Bulbs Radioactive?
- In-Reply-To: whit@milton.u.washington.edu's message of 3 Sep 92 02:50:04 GMT
- Message-ID: <JMC.92Sep2203926@SAIL.Stanford.EDU>
- Sender: news@CSD-NewsHost.Stanford.EDU
- Reply-To: jmc@cs.Stanford.EDU
- Organization: Computer Science Department, Stanford University
- References: <l9ns6oINNmol@utkcs2.cs.utk.edu> <1992Aug29.000626.16080@u.washington.edu>
- <1992Sep2.172549.29172@ornl.gov>
- <1992Sep3.025004.20771@u.washington.edu>
- Date: 2 Sep 92 20:39:26
- Lines: 56
-
- In article <1992Sep3.025004.20771@u.washington.edu> whit@milton.u.washington.edu (John Whitmore) writes:
-
- In article <1992Sep2.172549.29172@ornl.gov> de5@ORNL.GOV (Dave Sill) writes:
- >In article <1992Aug29.000626.16080@u.washington.edu>, whit@milton.u.washington.edu (John Whitmore) writes:
- >>In article <l9ns6oINNmol@utkcs2.cs.utk.edu> de5@ORNL.GOV (Dave Sill) writes:
- >>
- <talking about the things kids might eat>
- >>>Few of which are radioactive, since most folks don't have concentrated sources
- >>>laying around their house...unless they have smoke detectors or compact
- >>>flourescents. ... Radioactivity *is* a different kind of threat than most
- >>>parents are used to dealing with.
-
- >> This is not true; ALL organic foods are radioactive (carbon-14,
- >>remember?), and potassium contains 0.01% of K-40... so an eight-year-old
- >>child (just about hammer-wielding age) has a 'safe and adequate'
- >>recommended dietary intake of circa 1 gram of potassium per day...
- >>which comes to about two microcuries.
-
- >Which of my statements is not true? Do you consider organic foods
- >concentrated sources of radioactivity?
- Basically, you can't call a compact fluorescent lamp's
- initiator a 'concentrated radioactive source'. The initiator is
- no more radioactive than a bite of banana.
-
- I know of quite a few household items that have natural
- radioactivity which is large compared to that of compact fluorescent
- bulbs. International standard 'radiation warning' symbols are
- not present on those bulbs, because they are NOT HAZARDOUS
- radiation sources. There is no hazard here to be discussed.
- The radiation is comparable to (or less than) natural sources.
-
- What, exactly, is the reason for that label? I'm mystified.
- The reason for the radioactive materials is to initiate the arc
- in the discharge lamp; if you leave the source out, the bulb
- requires a 'starter' circuit (expensive and/or unreliable).
-
- John Whitmore
-
- I'll bet that the radioactivity label is required when any substance
- is added *because* of its radioactivity. The radioactivity in the
- smoke detector is added because it ionizes some of the air, or
- possibly smoke particles, in a tiny air gap inside the detector.
-
- Jym Dyer complains about the concentration, but the total possible
- exposure is surely more relevant. If someone will supply me with
- the previously posted data about the amount of radioactivity, I'll
- try to do a calculation and decide whether to offer to eat the
- radioactive part for a reasonable payment, e.g. $10,000 for every
- day it reduces my life expectancy. Am I allowed to encapsulate
- the active element in something that protects me from its chemical
- neighborhood?
- --
- John McCarthy, Computer Science Department, Stanford, CA 94305
- *
- He who refuses to do arithmetic is doomed to talk nonsense.
-
-