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| mrhm | milliroentgens per hour at one meter |
|---|---|
| rhm | roentgens per hour at 1 meter |
| mm | millimeter; 1/1000 Meter, 10-3 Meter |
| r/h | roentgens per hour |
| r/hr | roentgens per hour |
| ACH | air changes per hour |
|---|---|
| RSA | Roentgen Stereophotogrammetric Analysis |
| H | 1-hour |
| LFCM | Laser flare-cell meter |
| PFM | Peak Flow Meter |
| milligram hour | An obsolete term for a unit of exposure in radium therapy, i.e., the application of 1 milligram of radium during 1 hour. Synonym: milligramage. (05 Mar 2000) |
|---|---|
| hour | 1. <physics> The twenty-fourth part of a day; sixty minutes. 2. The time of the day, as expressed in hours and minutes, and indicated by a timepiece; as, what is the hour? at what hour shall we meet? 3. Fixed or appointed time; conjuncture; a particular time or occasion; as, the hour of greatest peril; the man for the hour. "Woman, . . . Mine hour is not yet come." (John II. 4) "This is your hour, and the power of darkness." (Luke xxii. 53) 4. A measure of distance traveled. "Vilvoorden, three hours from Brussels." (J. P. Peters) After hours, after the time appointed for one's regular labour. Canonical hours. See Canonical. 5. <astronomy> Hour angle, a line on which the shadow falls at a given hour; the intersection of an hour circle which the face of the dial. Hour plate, the plate of a timepiece on which the hours are marked; the dial. Sidereal hour, the twenty-fourth part of a sidereal day. Solar hour, the twenty-fourth part of a solar day. The small hours, the early hours of the morning, as one o'clock, two o'clock, etc. To keep good hours, to be regular in going to bed early. Origin: OE. Hour, our, hore, ure, OF. Hore, ore, ure, F. Heure, L. Hora, fr. Gr, orig, a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See Year, and cf. Horologe, Horoscope. Source: Websters Dictionary (01 Mar 1998) |
| kilowatt-hour | <unit> A standard measure of electrical energy, equals one kilowatt of power delivered for one hour. Equivalent to 3.6 million joules. For example, 1 kWh will light a 100-watt light bulb for 10 hours. 1 kWh = 3,413 Btu. Abbreviation: kWh (05 Dec 1998) |
| 24-hour cardiac monitor | <apparatus> A recording device, worn by the patient for the purpose of monitoring the hearts rhythm and rate, over a period of 24 hours. (27 Sep 1997) |
| Roentgen | <radiobiology, unit> The special unit of exposure, based on a quantity of ionisation (charge) produced by the absorption of X or gamma radiation energy in a specified mass of air under standard conditions. 1R = 2.58 x 10-4 C kg-1 or air. For radiation protection purposes, an exposure to 1 roentgen of x or gamma rays (air kerma of ~10-2 J kg-1) is generally assumed to produce an absorbed dose of 1 rad in water or soft tissue. Abbreviation: R (06 Aug 1998) |
| roentgen-equivalent | <radiobiology> A unit of dose equivalent to that quantity of ionizing radiation of any type that produces in man the same biologic effect as one rad of X-rays or gamma rays; the number of rems is equal to the absorbed dose, measured in rads, multiplied by the quality factor of the radiation in question.100 rem = 1 Sv. (05 Mar 2000) |
| roentgen-equivalent physical | <radiobiology, unit> A roentgen equivalent physical is a unit of absorbed radiation approximately equivalent to a roentgen, an international unit of x- or gamma-radiation. An obsolete unit of measurement; that quantity of ionizing radiation of any kind which, upon absorption by living tissue, produces an energy gain per gram of tissue equivalent to that produced by 1 roentgen of X-rays or gamma-rays. Acronym: rep See: rad. (05 Mar 2000) |
| roentgen ray | <investigation> A type of irradiation used for imaging purposes that uses energy beams of very short wavelengths (0.1 to 1000 angstroms) that can penetrate most substances except heavy metals. This is the commonest form of imaging technique used in clinical practice everywhere in the world with the image captured on photographic film. An AP film is when the beams pass from front-to-back (anteroposterior) and is used for mobile film, particularly on the ward or in casualty. This is the oposite to a PA film (posteroanterior) in which the rays pass through the body from back-to-front. Most films taken in the main radiology department are PA. (20 Jun 2000) |
| Roentgen, Wilhelm | <person, radiobiology> German scientist who discovered X-rays in 1895. (13 Nov 1997) |
| blood glucose meter | A machine that helps test how much glucose (sugar) is in the blood. A specially coated strip containing a fresh sample of blood is inserted in a machine, when then calculates the correct level of glucose in the blood sample and shows the result in a digital display. Some meters have a memory that can store results from multiple tests. (09 Oct 1997) |
| candle-meter | A unit of light or illumination; the reception of a luminous flux of 1 lumen per square meter of surface. Synonym: candle-meter, meter-candle. Abbreviation: lx Origin: L. Light (05 Mar 2000) |
| rate meter | A device that continuously displays the magnitude of events averaged over varying time intervals. (05 Mar 2000) |
| ventilation meter | A meter used to measure tidal and minute ventilatory volumes. (05 Mar 2000) |
| Venturi meter | A device for measuring flow of a fluid in terms of the drop in pressure when the fluid flows into the constriction of a Venturi tube. (05 Mar 2000) |
| gram-meter | <unit> A unit of energy equal to 100 gram-centimeters. (05 Mar 2000) |
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