Discrete and continuous measurement of indoor radon concentrations, air flow rates, and pressure differentials for passive and active operational configurations of a passive radon control system were performed at the Biotechnology Research and Development Facility of the University of Florida, in Alachua County, Florida. The system was installed during construction and incorporated an extended ...

The olfactory recess - a blind pocket at the back of the nasal airway - is thought to play an important role in mammalian olfaction by sequestering air outside of the main airstream, thus giving odorants time to re-circulate. Several studies have shown that species with large olfactory recesses tend to have a well-developed sense of smell. However, no study has investigated how the size of the ...

Abstract. Correlations of nighttime atmospheric methane (CH4) and 222radon (222Rn) observations in Heidelberg, Germany, were evaluated with the radon tracer method (RTM) to estimate trend annual nocturnal CH4 emissions from 1996–2020 footprint station. After an initial 30 % decrease 1996 2004, there was no further systematic but small inter-annual variations observed thereafter. This is accorda...

We describe a method for the collection of expired air and further document the performance of our analytical technique that is used to measure ethane and pentane simultaneously. Four minutes of breathing hydrocarbon-free air before collection effectively removed high concentrations of residual ambient ethane and pentane from the lungs, with washout times up to 30 min resulting in no further re...

A long list of row materials are brought from the desert and invested in feeding of many industries. The investigation of radionuclides distribution and radiation levels of such materials is important to assess the potential hazard of radiation exposure for those working in such industries. In this work the high-resolution gamma-ray spectroscopic system was used to measure the radionuclides con...

Radon emanation rates from 48 concrete blocks have been monitored throughout a period in excess of 1 yr. These blocks have been produced for three distinct mixes of materials, i.e. mix A with 25% by weight substitution of type A pulverized fuel ash (PFA), mix B with 25% by weight substitution of type B PFA and mix C without PFA. Each mix is represented by four sets of concrete blocks with curin...

Inhalation of indoor radon ((222)Rn) and thoron ((220)Rn) decay products is the most important source of exposure to ionizing radiation for the human respiratory tract. Decreasing ventilation rates due to energy saving reasons in new buildings suggest additional active mitigation techniques to reduce the exposure in homes with high radon and thoron concentrations but poor ventilation. Filtratio...

The starting point of the Spanish experience in the study of High Background Radiation Areas is the development of a nationwide indoor radon survey carried out in 1988. This campaign, belonging to the first Spanish Radon Framework, consisted of approximately 2000 indoor radon measurements which represented a valuable basis to face rigorously the radon issue in Spain. Together but indepently fro...