background: radon concentration was measured in 50 drinking water samples in mashhad - iran. b the tap water used for drinking and other household usages can increase the indoor radon level. drinking water samples were collected from various places and supplies of public water used in mashhad. then radon concentration has been measured by portable radon gas surveyor silena (prassi) system. resu...

introduction cr-39 detectors are widely used for radon and progeny measurement in the air. in this paper, using the monte carlo simulation, the possibility of using the cr-39 for direct measurement of radon and progeny in water is investigated. materials and methods assuming the random position and angle of alpha particle emitted by radon and progeny, alpha energy and angular spectrum that arri...

We have developed a new, robust, curvature estimator. It is based on ”fitting” circular segments to a curve using a generalised Radon transform. The key step in the approach is that the fitting operation is not done in the original image, but in a transformed version, called Orientation Space. The original curve is transformed into another curve in Orientation Space. Apart from the original spa...

Let (E ′, μ) be the real Gaussian space, where E ′ is the space of tempered distributions and μ be the standard Gaussian measure on E ′. In the recent papers [4, 7, 8], Asai, Kubo and Kuo (AKK for short) have shown that in order to construct the Gel’fand triple [E ]u ⊂ L2(E ′, μ) ⊂ [E ]u associated with a growth function u ∈ C+,1/2, essential conditions on u are (U0)(U2)(U3) stated in Section 2...

We give in this note a generalisation of the following theorem of Henkin and Passare (cf. [7] and [8]) : Let be Y an analytic subvariety of pure codimension p in a linearly p−concave domain U , and ω a meromorphic q−form (q > 0) on Y ; if the Abel-Radon transform R(ω ∧ [Y ]), which is meromorphic on U * , has a meromorphic prolongation tõ U * containing U * , then Y extends as an analytic subva...

Domestic, low-level exposure to radon gas is considered a major environmental lung-cancer hazard involving DNA damage to bronchial cells by a particles from radon progeny. At domestic exposure levels, the relevant bronchial cells are very rarely traversed by more than one a particle, whereas at higher radon levels—at which epidemiological studies in uranium miners allow lung-cancer risks to be ...

background: nowadays, extensive technological advancements have made it possible to use nanopaints which show exciting properties. in ir iran excessive radon levels (up to 3700 bq m–3) have been reported in homes located in radon prone areas. over the past decades, concerns have been raised about the risk posed by resi- dential radon exposure. objective: this study aims at investigating the eff...

INTRODUCTION Radon is the second leading cause of lung cancer among smokers and the leading cause among nonsmokers. The US Environmental Protection Agency recommends that every home be tested for radon. Comprehensive Cancer Control (CCC) programs develop cancer coalitions that coordinate funding and resources to focus on cancer activities that are recorded in cancer plans. Radon tests, remediat...

background: while in the open air the amount of radon gas is very small and does not pose a health risk, in confined spaces, radon can accumulate to relatively high levels and become a health hazard. exposure to high levels of radon has been associated with an increased risk of lung cancer, depending on the time length of exposure. radon level in dwelling of shiraz with 1,200,000 populations ha...