Value chain · CLM-0150
In plain terms
A 1982 Japanese review notes that, at the time, the American and Soviet safety limits for microwave exposure were far apart (1000 times, by our arithmetic), and that the proposed space solar power design's own human-safety figure was ten times stricter than the US limit of that era.
The claim as recorded
Matsuura (1982) separately states an inferred power-density ceiling of about 200 W/m2 to avoid serious ionospheric disturbance, and a human-exposure limit of 10 W/m2 or less required near the receiving antenna, noting that the then-current (1982) US continuous-exposure allowance was 100 W/m2 (making the 10 W/m2 SPS design figure one-tenth of the US limit) while the then-current Soviet limit was 0.1 W/m2 - a 1000-fold difference between the two national standards of the day by our arithmetic (100/0.1). Matsuura names no population; 0.1 W/m2 (10 uW/cm2) is the Soviet occupational full-working-day value in CLM-1006, CLM-1285 and CLM-1297, whose Soviet public limits are lower (1 or 5 uW/cm2).
Scope and limits
1982-era national exposure standards, long since superseded by ICNIRP/IEEE harmonisation (already recorded elsewhere). Documents the historical divergence, not a current regulatory position. The 200 W/m2 ionosphere-disturbance figure is distinct from the separately-recorded 230 W/m2 self-focusing figure or the current 10/50 W/m2 ICNIRP figures.
What it assumes
Matsuura's stated 1982 US (100 W/m2) and Soviet (0.1 W/m2) continuous-exposure figures are accurate for that year, and both are occupational values (US ANSI 10 mW/cm2; USSR 10 uW/cm2 working day); historical national standards, since superseded.
Where it comes from
Matsuura (1982), p.724, left column: "電離圏を透過するマイクロ波ビームが電離圏に重大な擾乱を誘起しないための電力密度上限値は約200W/m2と推論されており，また，マイクロ波ビームが人体に悪影響を与えないための電力密度制限10W/m2以下が受電アンテナ周辺において満たされなければならない。" and, in the right column of the same page after the 230 W/m2 passage, the USSR "same allowance as above" (the continuous-irradiation allowance for the human body) as 0.1 W/m2 with the paper's note of a considerable gap between the US and Soviet limits of the day; the page does not say 1000-fold ("両者の間にはかなりの隔たりがある").
Basis: power density, W/m2, continuous whole-body exposure, at 2.45 GHz
Related records
- Answers question
- QST-001 not published in this release
Cite this
energyaperture.com/c/clm-0150
CLM-0150, Energy Aperture, as of 1982.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-141
- CLM-0126The 1982 source behind the disputed 10 per cent absorption figure actually says absorption is 0.002 per cent, and never mentions solar...CLM-0149A 1982 Japanese government radio-research review says the famous 230 watts-per-square-metre figure was only ever a theoretical calculation...CLM-0947A 1982 Japanese review calculates that the ionosphere absorbs about one part in fifty thousand of a 2.45 GHz power beam - around 0.1 MW...