Value chain · CLM-1358
In plain terms
At and below 180 W/m2, rats warmed slightly but less than they do from being handled, and they slept through it. At 360 W/m2, they had to use emergency cooling.
The claim as recorded
A 1973 talk reports that unrestrained young male Long-Evans rats exposed to 2450 MHz CW in the far field for 150 minutes at 9, 18 and 36 mW/cm2 (90, 180 and 360 W/m2) showed sustained colonic temperature rises that scaled with density, about twice at 18 as at 9 and about four times at 36, returning to baseline within 30 minutes after exposure at 9 and 18. At 9 mW/cm2 the rats did not wake; at 18 most woke within an hour and then rested; the rises at both levels stayed within the rise caused by 15 minutes of handling stress in the chamber. At 36 mW/cm2 all rats were awake by 30 minutes, stretched out by 60, and by 90 minutes were wetting their fur, which appeared to halt the rise. A rat carcass at 36 mW/cm2 gained heat at 2.42 W, against an estimated basal heat loss of 2.04 W.
Evidence behind this: T3, a meeting abstract and talk text; it permits "the talk reports Y". Each point at least 8 rats.
Scope and limits
ANIMAL, NOT HUMAN. Temperature values are only on the slide graph (PDF p.14), not read; the multiples are the talk's words. Rats decapitated before colonic reading (within 60 s). Incident density only. The two abstracts in the file disagree: PDF p.1 gives 400 rats at 9/18/36 mW/cm2, the printed Physiologist abstract on PDF p.2 gives 500 rats at 3/10/20/30 mW/cm2; this record follows the talk text, which matches PDF p.1. Carcass SAR about 2.42 W / 0.4 kg = 6 W/kg at 36 mW/cm2 (my arithmetic, unverified). 18 mW/cm2 = 180 W/m2.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
PDF p.9: results at 9, 18 and 36 mW/cm2, each point at least 8 rats; at 9 and 18 mW/cm2 levels "do not seem to disturb the animals in any inordinate manner"; behaviour by density (paraphrase). PDF p.8: 400 rats, 350-425 g, 3 h equilibration, 150-min exposure, anechoic chamber at 21-22 deg C (paraphrase). PDF p.6-7: carcass heat input 2.42 W at 36 mW/cm2, cooling 2.04 W, fur-wetting threshold (paraphrase). PDF p.10: rises fever-like and sustained (paraphrase).
Basis: mW/cm2 incident, far field, CW; 150 min; colonic temperature; carcass heat balance in W
Related records
- Answers question
- QST-023 not published in this release
Cite this
energyaperture.com/c/clm-1358
CLM-1358, Energy Aperture, as of 1973-08.