The angular and energetic distribution of alpha particles from the Rn chain in air incident on a detector have been determined by the Monte Carlo method. Stopping power of alpha particles in air have been taken from the ICRU49 report. The incident alpha-particle spectrum was found for various equilibrium factors. It has been shown that the spectrum between 5.5 and 7.69 MeV depends on the equili...

Radon and its decay products are the main source of ionizing radiation in non-industrial buildings. They are responsible for about half of the radiation dose people in Poland are exposed to [1]. Radon is a naturally occurring radioactive gas that originates from the decay of radium (226Ra) in the primordial uranium (238U) decay series. Radon concentrations in buildings are usually higher than o...

the influence of parasitoids on population dynamics is affected by host instar preference. the preference pattern of host instars is not fixed and is modified by the availability and relative abundance of host instars, intensity of defensive behaviors in a particular instar, and also maternal effects of the female forager. in this study, host instar preference of the thelytokous strain of lysip...

Thedesignanduseof a new device for increasing low level Alpha counting efficiency of the standard AN/PDR-56 Alpha Particle Meter is described. Directions for its construction, list of materials required, photographs and diagrams are furnished. The practical application of shipboard utilization of such a device is pointed out. ADMINISTRATIVE INFORMATION This report was completed in partial fulfi...

Surface contamination of $^{222}$Rn progeny from the $^{238}$U natural decay chain is one most difficult background contributions to measure in rare event searches experiments. In this work we propose AlphaCAMM, a gaseous chamber read with segmented Micromegas, for direct measurement $^{210}$Pb surface flat samples. The detection concept exploits readout capabilities Micromegas detectors recons...

Due to ordered, stage-specific T cell receptor (TCR)-beta and -alpha locus gene rearrangements and cell division during T cell development, a given, ancestral TCR-beta locus VDJ rearrangement might be selected into the mature T cell repertoire as a small cohort of "half-sibling" progeny expressing identical TCR-beta chains paired with different TCR-alpha chains. The low frequency of such a coho...