Photographic X-ray sensitive acceleration plates. : 無料・フリー素材/写真
Photographic X-ray sensitive acceleration plates. / SarahCartwright
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | Photographic film is sensitive to X-rays, but few rays interact with it. (X-rays passing through matter is a blessing and curse)To speed up the exposure, the photographic film is placed between two plastic screens of phosphor that glow when X-rays hit them. These are glued to the two inside sides of the X-ray plates. In the photo above, one screen remains, and one has been removed from the opposite side of the left plate. The right plate is closed.This extra green light from both sides further exposes the X-ray plate - making a faster exposure. The plates can be photographed using a long exposure in complete darkness when exposed to X-rays to get a bright green silhouette of an object between the X-ray source and the phosphor screen.The plates are coated with various forms of phosphor that most often glow blue or green - and come in several sensitivities. The more sensitive the phosphor, the brighter it glows, but the blurrier the image it produces due to the crystal size.For my images I use a HD-S screen which is a bit faster than normal and still gives fairly sharp results.In modern X-ray units none of this hardware exists - a re-useable electronic X-ray sensitive plate is used instead. =( |
| 撮影日 | 2019-11-02 16:34:25 |
| 撮影者 | SarahCartwright , Chester, UK |
| タグ | |
| 撮影地 | |
| カメラ | SM-G930F , samsung |
| 露出 | 0.1 sec (1/10) |
| 開放F値 | f/1.7 |