Value chain · CLM-1305
In plain terms
Six months nearly round the clock in a field of about 100 W/m2 at the head did not cause cataracts or other eye changes in four rabbits. Acute cataracts in rabbits in the cited earlier work needed more than 100 mW/cm2.
The claim as recorded
Four rabbits exposed to 2450 MHz CW for 23 hours a day, 7 days a week for six months, at a mean 10 mW/cm2 at the head (peak head SAR 17 W/kg), showed no differences from four shams in the eyes beyond normal ageing in all eight. Body mass, urinary output, rectal temperature, haematocrit, haemoglobin, white cell count and basic coagulation also showed no significant differences, except a lower eosinophil percentage. Field mapping before the final exposure found maximal incident densities of 23.4 to 30.4 mW/cm2 at the dorsal aspect of the head in the four chambers, against 10 mW/cm2 predicted at the body axis from free-space horn data.
Evidence behind this: T1-a refereed 1980 journal article (inferred); four exposed and four sham rabbits; slit-lamp eye examinations.
Scope and limits
FOUR EXPOSED ANIMALS; NO STATISTICS ON THE EYE FINDINGS; RABBIT, NOT HUMAN. It is not clear from the page whether the 23.4-30.4 mW/cm2 maxima (PDF p.5) still applied after the final 32 W setting (PDF p.6); this record does not resolve it. Read either way, peak exposure at the head may have been 2-3 times the stated 10 mW/cm2. The cataract thresholds are other authors' acute results cited here, not this study's findings. Industry co-funding (AHAM) is stated on PDF p.8. 10 mW/cm2 = 100 W/m2; 23.4-30.4 mW/cm2 = 234-304 W/m2, around the 230 W/m2 design centre (my arithmetic).
What it assumes
No assumptions are recorded against this claim.
Where it comes from
PDF p.1: comparison with sham rabbits "revealed no significant effects in terms of eyes", body mass, urinary output, rectal temperature and blood measures. PDF p.7: "Aside from normal aging changes" in the lenses of the 8 animals, no differences were "noted in the eyes of the two groups"; eosinophil decrease the only difference (paraphrase). PDF p.6: 32 W horn input gave a mean 7 mW/cm2 at body axis, 10 at the head, 14.5 at the cage top; peak head SAR 17 W/kg against an estimated 1.5 W/kg whole-body maximum (paraphrase). PDF p.5: maximal incident densities "29.1, 23.4, 30.4, and 25.3 mW/cm2" at the dorsal head in the four chambers. PDF p.1-2: cited acute thresholds, 590 mW/cm2 for 5 min, 220 for 4.5 h, none at 120 (Williams), 120 mW/cm2 with repeated exposure (Carpenter) (paraphrase).
Basis: mW/cm2 incident; W/kg peak SAR; 23 h/day x 180 days
Related records
- Answers question
- QST-023 not published in this release
Cite this
energyaperture.com/c/clm-1305
CLM-1305, Energy Aperture, as of 1980.