羽毛集合体の物性 (第2報)
紫外線劣化
1976 年 27 巻 4 号 p. 304-308
詳細
1976 年 27 巻 4 号 p. 304-308
To investigate the damage of feathers caused by exposing to radiation of ultraviolet ray, untreated and washing treated feathers were exposed to ultraviolet ray and the growth of X-ray-crystallinity during exposure was studied experimentally.
Stanlay Sun Lamp SSL 250A was used as the source of ultraviolet radiation. The characteristics of this lamp are as follows; the wave-length of maximum intensity is about 365 nm, which can be absorbed by feathers. The radiation energy of this wave-length is 403 μW/cm2 at the distance of 50 cm from the center of the lamp.
It was obtained that as the exposure time increased, the X-ray-crystallinity of the feather increased and the relation between ultraviolet radiation dosages and X-ray-crystallinity was linear in the range of our experiments.
From these results it is considered that feather quilts have not to be exposed to direct rays of the sun, because it seems that feathers will receive radiation damages by solar radiations more than by lamp used in our experiments.
