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Sievert - Wikipedia, the free encyclopedia
Equivalency Weighting Factors[1] Radiation type and energy range Factor electrons, positrons, muons, or photons (gamma, X-ray) 1 neutrons <10 keV 5 neutrons 10-100 keV 10 neutrons 100 keV - 2 MeV 20 neutrons 2 MeV - 20 MeV 10 neutrons >20 MeV 5 protons other than recoil protons and energy >2 MeV 2 alpha particles, fission fragments, nonrelativistic heavy nuclei 20
neutrons 10-100 keV 10 neutrons 100 keV - 2 MeV 20 neutrons 2 MeV - 20 MeV 10
But the specific numerical factors must have been determined empirically though who knows what procedures.
Rolf Maximilian Sievert - Wikipedia, the free encyclopedia
Professor Sievert (Swedish pronunciation: [ˈsiːvəʈ]) was born in Stockholm, Sweden. He served as head of the physics laboratory at Sweden's Radiumhemmet from 1924 to 1937, when he became head of the department of radiation physics at the Karolinska Institute. He played a pioneering role in the measurement of doses of radiation especially in its use in the diagnosis and treatment of cancer. In later years, he focused his research on the biological effects of repeated exposure to low doses of radiation. In 1964, he founded the International Radiation Protection Association, serving for a time as its chairman. He also chaired the United Nations Scientific Committee on the Effects of Atomic Radiation. He invented a number of instruments for measuring radiation doses, the most widely known being the Sievert chamber.
Professor Sievert (Swedish pronunciation: [ˈsiːvəʈ]) was born in Stockholm, Sweden. He served as head of the physics laboratory at Sweden's Radiumhemmet from 1924 to 1937, when he became head of the department of radiation physics at the Karolinska Institute. He played a pioneering role in the measurement of doses of radiation especially in its use in the diagnosis and treatment of cancer. In later years, he focused his research on the biological effects of repeated exposure to low doses of radiation. In 1964, he founded the International Radiation Protection Association, serving for a time as its chairman. He also chaired the United Nations Scientific Committee on the Effects of Atomic Radiation.
He invented a number of instruments for measuring radiation doses, the most widely known being the Sievert chamber.
How are you going to do that "without a custom ready shiny instrument"?
To put it in other way, how can you verify what the "custom ready shiny instrument" is saying with more basic means? Do you know other measurements that are comparatively hard to replicate independently?
To put it in other way, how can you verify what the "custom ready shiny instrument" is saying with more basic means?
If you trust that the manufacturer is not completely full of shit, you can read the specifications to see whether it is capable of doing what you want it to do.
If you're just looking at one on TV, you have no way to reassure yourself that it does what the newsies claim it does. Even if the manufacturer is honest (which he usually is), and even if the newsie understands the difference between a dosimeter a Geiger counter (which he usually doesn't), the TV format is not conducive to providing verifiable facts.
When I see something measuring radiation on TV, I tend to assume that it's a Geiger counter, because those are sufficiently useful that you want them around and sufficiently simple (and cheap) that they can be issued in bulk. They also make better TV than dosimeters, because Geiger counters go click-click-click, while dosimeters are quiet until they tell you to haul ass (and a newsie won't be allowed to come along if there's even a remote chance that the dosimeter will tell him to haul ass at some point during the show). Geiger counters measure Becquerel, however, and any conversion from Bq to Sv/h must necessarily rely on some pre-set assumptions about the distribution of radioactive atoms and the ratio between ambient and internal exposure.
As a practical matter, you use the Geiger counter to tell whether you are in one of four kinds of situation:
Do you know other measurements that are comparatively hard to replicate independently?
Oh, lots. Particulate pollution levels and pollen readings, just off the top of my head.
What I can not recall off the top of my head is one that combines this level of obscurity with quite so strong vested interests.
- Jake Friends come and go. Enemies accumulate.
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