نتایج جستجو برای: exhalation rate

تعداد نتایج: 961135  

A.A. Abojassim, D. Naji, L.A. Najam, T.A. Hussain,

Background: Hair dyes are the important materials widely used by various peoples in Iraq and other countries. The present work investigates the presence of the effective radium content and radon exhalation rate in hair dyes samples. Materials and Methods: Twenty  hair dyes  samples were collected from Iraqi markets. Sealed can technique using LR-115 type II plastic track detector s ha...

D. Verma, M. Shakir Khan, M. Zubair,

Background: Radon is an odourless, colourless and tasteless gas and it is the first cause of lung cancer among non- smokers. The assessment of the level of radium in building materials helps in understanding the radiological implications. It has been observed that everyone has some levels of exposure to them. Therefore measurement of radium and radon in the soil samples are important f...

Journal: :iranian journal of radiation research 0
m. nain department of physics, govt. p.g. college, karnal, haryana, india 132001 r.p. chauhan departments of physics, indira gandhi national college, ladwa, kurukshetra, india 136132 s.k. chakarvarti department of applied physics, n.i.t. deemed university, kurukshetra, india 136119

abstract  background: the essential constituents of cements like lime, silica and alumina are derived from earth’s crust in which radioactive elements like uranium, thorium etc are also present in varying amounts almost everywhere. these two elements are considered as the parent elements of uranium and thorium radioactive decay series in which radon and thoron are produced respectively as decay...

2015
AMIT KUMAR R. P. CHAUHAN Amit Kumar

Building materials are significant contributor of indoor radon after the soil. The indoor radon level depends upon the radon flux coming out from wall, ceiling and roofs of the dwellings. The radon flux from the wall that in most cases is concrete depends upon many factors like radium content, porosity, moisture, composition of mix design for construction of concrete and age of concrete. The pr...

2004
Weihai Zhuo Takao Iida Shinji Tokonami Yuji Yamada

A rapid method for directly determining the exhalation rate of thoron from material surfaces was studied. Thoron accumulated with the accumulation chamber is detected with the scintillation cell. The alpha counting efficiency of the scintillation cell was estimated by the Monte Carlo calculation. Measurements were carried out in a sandy loam and different building materials. The results show th...

Journal: :iranian journal of radiation research 0
m. zubair department of applied physics, zakir hussain college of engineering and technology, aligarh muslim university, aligarh 202002, india m. shakir khan department of applied physics, zakir hussain college of engineering and technology, aligarh muslim university, aligarh 202002, india d. verma department of applied physics, zakir hussain college of engineering and technology, aligarh muslim university, aligarh 202002, india

background: radon is an odourless, colourless and tasteless gas and it is the first cause of lung cancer among non- smokers. the assessment of the level of radium in building materials helps in understanding the radiological implications. it has been observed that everyone has some levels of exposure to them. therefore measurement of radium and radon in the soil samples are important from publi...

1990
Christer Samuelsson

Results from closed-can radon exhalation experiments must be interpreted bearing the time-dependent radon diffusion theory in mind. A rapid change from the free to final steady-state exhalation rate will take place for all samples that are thin compared with the radon diffusion length. The radon gas accumulating in a closed can corresponds to a free exhalation rate only if the outer volume of a...

Journal: :Journal of environmental radioactivity 2010
Jing Chen Naureen M Rahman Ibrahim Abu Atiya

Long-term exposure to radon increases the risk of developing lung cancer. There is considerable public concern about radon exhalation from building materials and the contribution to indoor radon levels. To address this concern, radon exhalation rates were determined for 53 different samples of drywall, tile and granite available on the Canadian market for interior home decoration. The radon exh...

Journal: :Canadian journal of anaesthesia = Journal canadien d'anesthesie 2007
Usharani Nimmagadda M Ramez Salem Ninos J Joseph Istvan Miko

PURPOSE We evaluated the influence of prior maximal exhalation on preoxygenation in 15 adult volunteers using tidal volume breathing (TVB) for five minutes and deep breathing (DB) for two minutes with and without prior maximal exhalation. METHODS Inspired and end-tidal oxygen, nitrogen and carbon dioxide were monitored continuously and recorded during room air breathing and at 30-sec interval...

2014
Ajay Kumar Saurabh Narang

In the present investigation, soil samples were collected from 10 villages belonging to Pathankot district, Punjab, India and assessed for radium content using LR-115 plastic detector. The ‘track etch’ technique has been employed for measuring the radium content. From the radium content, radon exhalation rates and mass exhalation rates were calculated for these samples. The mass exhalation rate...

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