radon

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ra·don

(rā′dŏn)

n. Symbol Rn

A colorless, radioactive, inert gaseous element that is formed by the radioactive decay of radium and is used to produce neutrons for research. Its most stable isotope is Rn-222 with a half-life of 3.82 days. A natural source of radiation found in most soils and groundwater, radon poses a serious health threat if inhaled. Atomic number 86; melting point -71°C; boiling point -61.7°C; density of gas 9.73 grams per liter; specific gravity (solid) 4. See Periodic Table.

[rad(ium) + -on.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

radon

(ˈreɪdɒn)

(Elements & Compounds) a colourless radioactive element of the rare gas group, the most stable isotope of which, radon-222, is a decay product of radium. It is used as an alpha particle source in radiotherapy. Symbol: Rn; atomic no: 86; half-life of ²²²Rn: 3.82 days; valency: 0; density: 9.73 kg/m³; melting pt: –71°C; boiling pt: –61.7°C

[C20: from radium + -on]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ra•don

(ˈreɪ dɒn)

n.

a chemically inert, radioactive gaseous element produced by the decay of radium: emissions produced by outgassing of rock, brick, etc., are a health hazard. Symbol: Rn; at. no.: 86; at. wt.: 222.

[< German Radon (1918); see radium, -on ²]

ra·don

(rā′dŏn)

Symbol Rn A colorless, odorless, radioactive element that is a noble gas. It is produced by the radioactive decay of radium and occurs in minute amounts in soil, rocks, and the air near the ground. Radon is used as a source of radiation for the treatment of cancer and other diseases. Its most stable isotope has a half-life of about four days. Atomic number 86. See Periodic Table.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun 1. [画像:radon - a radioactive gaseous element formed by the disintegration of radium]radon - a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health

atomic number 86, Rn

chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

argonon, inert gas, noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table

Translations

رادون

радон

radon

Radon

ραδόνιο

radono

radón

radoon

radon

radon

radon

rado radon

ラドン

radon

radon

rádon

radon

радон

radon

радон

radon

радон

radon

[ˈreɪdɒn] N (also radon gas) → radón m

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

radon

[ˈreɪdɒn] n → radon m

Collins English/French Electronic Resource. © HarperCollins Publishers 2005

radon

n (Chem) → Radon nt

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

ra·don

n. radón, elemento radiactivo gaseoso.

radon

n radón m

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References in periodicals archive ?

Radon is the second biggest cause of lung cancer after smoking so the government closely monitors and controls its presence, publishing details of where it is most prevalent through Public Health England (PHE).

The Surrey areas with the highest amounts of radioactive element radon that causes lung cancer; The colourless and odourless gas is the second biggest cause of lung cancer and it's present in our homes and work places

The estimated contribution of radon to lung cancer risk varied widely by country, with the variation influenced by tobacco smoking rates, geology, and home characteristics (for instance, a dwelling's airtightness or the floor area in contact with the ground), says lead author Janet Gaskin, a PhD candidate in the School of Epidemiology and Public Health at the University of Ottawa.

Radon Risk: A Global Estimate of Radon's Contribution to Lung Cancer

Radon is a radioactive gas naturally found in rock and soil.

Test kit for radon

Similarly, 20 samples were collected from UC Shahi Bagh and showed radon concentrations of, 51.6 +- 2.9, 12.7 +- 1.7 and 33.5 +- 2.5 Bql-1 as their maximum, minimum and mean values, respectively.

ASSESSMENT OF RADON CONCENTRATION IN THE WATER SOURCES OF TOWN 1 PESHAWAR AND ITS EFFECTS ON ENVIRONMENT

A spokeswoman said: "We have identified slightly higher than average levels of radon in our branch in Caernarfon.

RADIOACTIVE GAS AT BANK; But no risk to customers, say HSBC bosses

The BEIR VI report stated that based on the analysis of available residential radon studies, it could not determine the shape of dose-response and so it decided to utilize the linear no-threshold (LNT) model to estimate the lung cancer risk from residential radon.

LETTER TO THE EDITOR (AUGUST 24, 2017) CONCERNING THE PAPER "OCCUPATIONAL EXPOSURE TO RADON FOR UNDERGROUND TOURIST ROUTES IN POLAND: DOSES TO LUNG AND THE RISK OF DEVELOPING LUNG CANCER"

When BALB/c mice were treated with a lower dose of CDDP (15 mg/kg) after 1000 Bq/m3 radon inhalation, the creatinine level was reduced and the superoxide dismutase content was increased, suggesting that this combination might have a protective effect against the CDDP-induced renal damage.

Comparative Effects of Radon Inhalation According to Mouse Strain and Cisplatin Dose in a Cisplatin-induced Renal Damage Model

Several factors can increase radon levels in the winter months, allowing specialists to accurately assess the risks to homeowners.

Radon Rid Advises That Winter is the Best Time for Radon Testing and Radon Remediation

With the exception of those with high occupational exposures, the residential environment is the most important source of radon exposure for the majority of people (Pershagen et al., 1994).

Predictors of Radon Testing Among Utah Residents Using a Theory-Based Approach

Environmental Protection Agency radon expert Dr David Fenton said: "This is a radioactive gas that has no colour, taste or smell so your senses are blind to it.

Deadly gas killing 250 people a year with lung cancer; RTE SHOW REVEALS LETHAL DANGER IN IRISH HOMES; Radon seeps naturally from rocks

Researcher in Trinity's School of Natural Sciences Javier Elio said: "We estimate approximately 19% of homes in high risk areas will have indoor radon concentrations higher than the national reference level and remedial action should be taken.

Half a million living with unsafe radon gas levels; Risk map shows 10% of population under threat