| 영문 | infrared ray | 한글 | 적외선 |
|---|---|---|---|
| 설명 | 파장이 가시광선보다 길며 극초단파보다 짧은 750μm~1mm의 전자파. 눈으로는 볼 수 없고 일반적으로 공기 가운데에서 산란되기 어려우며, 가시광선보다 투과력이 강하다. 사진 적외선-근적외선-원적외선 따위로 나눌 수 있는데, 단파장 부분에는 사진 작용-형광 작용-광전 작용이 있어, 적외선 사진이나 적외선 통신-물질 감정-의료 따위에 이용한다. 1800년에 허셀이 발견되었다. 적외선은 물질에 부딛치며 구성분자의 열운동을 일으켜서 열효과를 주게되므로 열선이라고도 불린다. 태양광선의 약 52%는 적외선이다. 700~800nm의 적외선은 인체피부를 투과해서 피하에까지 이른다. 과도의 적외선 조사는 피부에 온열성홍반을 일으키게 해서 화상을 일으킬 수 있다. |
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| hot pack | A pack of cloth or other material soaked in hot water, or producing moist heat by another means. (05 Mar 2000) |
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| hot salt steriliser | A steriliser for endodontic equipment in which table salt is heated in a container at 218 to 246캜; the dry heat is transmitted to root canal instruments, absorbent points, or cotton pellets for their rapid (5 to 10 seconds) sterilization. (05 Mar 2000) |
| hot-short | <chemistry> More or less brittle when heated; as, hot-short iron. Source: Websters Dictionary (01 Mar 1998) |
| hot spleen | <radiology> Decreased liver uptake, liver disease (e.g., cirrhosis), shunting of portal venous blood, increased splenic uptake, haematopoietic disease, septicaemia, rheumatoid disorders, immunostimulation (tumour, Aldomet, IL-2) see: liver-spleen scan (12 Dec 1998) |
| hot spot | <molecular biology> A particular area of DNA which is especially prone to spontaneous mutations or recombinations. (09 Oct 1997) |
| hot thyroid nodule | <radiology> Almost always hyperfunctioning adenoma, vast majority benign, up to 50% are autonomous see also: thyroid carcinoma, cold thyroid nodule (12 Dec 1998) |
| actinic ray | A light ray toward and beyond the violet end of the spectrum that acts upon a photographic plate and produces other chemical effects. Synonym: chemical ray. (05 Mar 2000) |
| alpha ray | <physics> A radioactive particle made up of two protons and two neutrons, these particles are created by the decay of a radioactive material or by nuclear bombardment, and they are the same as the nucleus of a helium-4 atom. (09 Oct 1997) |
| ap, X-ray | An X-ray picture in which the beams pass from front-to-back (anteroposterior). As opposed to a PA (posteroanterior) film in which the rays pass through the body from back-to-front. (12 Dec 1998) |
| beta ray | 1. <radiobiology> Original term used for electrons (and positrons) ejected from decaying nuclei via beta emission. (Label derives from the old days when we had various kinds of radiation emission, and they were labelled alpha, beta, and gamma (the first letters of the Greek Alphabet) because no one really knew what any of them were.) 2. A stream of positive or negative electrons ejected with high energy from a disintegrating atomic nucleus; most biomedically used isotopes emit negative particles (electrons or negatrons, rather than positrons). Cathode rays are low-energy negative electrons produced in cathode ray tubes, also called television tubes or oscilloscopes. (12 Sep 2000) |
| gamma ray | <radiobiology> Electromagnetic radiation (photons) with energies greater than (roughly) 100 keV (that is, 100,000 electron volts). Gamma radiation frequently accompanies alpha and beta decays, and always accompanies fission. Gamma rays are highly penetrating and are best shielded against using dense materials, such as lead or depleted uranium. (Gamma rays are similar to X-rays, but are generally higher in energy and nuclear in origin.) Gamma rays have wavelengths of 1 nanometre or shorter. These are highly energised, deeply penetrating photons which can be emitted from an atomic nucleus during nuclear fission (the splitting of an atom) and during regular atomic decay (radioactivity). (13 Oct 1997) |
| gamma ray knife | A beam of high energy X-rays. See: radiosurgery. (05 Mar 2000) |
| panoramic X-ray | <dentistry> An X-ray taken by a machine that rotates around your head to give the orthodontist a picture of your teeth, jaws and other important information. (08 Jan 1998) |
| panoramic X-ray film | In dentistry, a radiograph taken to give a panoramic view of the entire upper and lower dental arch as well as the temporomandibular joints. (05 Mar 2000) |
| ray | <botany> A zygomorphic flower in the family Asteraceae, a radial band of cells traversing the conducting elements in woody stems. Of a compound umbel, one of the first (lower) series of branches of the inflorescence main stem. (09 Oct 1997) |