radioactivedecay is a Python package for radioactive decay modelling. It contains functions to fetch data, define inventories of nuclides and perform calculations. The default nuclear dataset supplied with based on ICRP Publication 107, which covers 1252 radioisotopes 97 elements. code calculates an analytical solution matrix form the chain differential equations using double or higher precisio...

The oRules of state reduction are applied to the Schrödinger cat experiment. It is shown that these rules can unambiguously describe the conscious state of the cat, as well as an outside observer at any time during the experiment. Two versions of the experiment are considered. In version I, the conscious cat is made unconscious by a mechanism that is triggered by a radioactive decay. In version...

We study the dynamics of a radioactive species flowing through a porous material, within the Continuous-Time Random Walk (CTRW) approach to the modelling of stochastic transport processes. Emphasis is given to the case where radioactive decay is coupled to anomalous diffusion in locally heterogeneous media, such as porous sediments or fractured rocks. In this framework, we derive the distributi...

We report on Auger stimulated ion desorption via Coulomb explosion from surface self-assembled alkylthiol and fluorocarbon molecular layers, triggered by K-capture decay of an imbedded radioactive 55Fe atom. The charge state of the ejecta is determined by charge exchange in binary atomic collisions in bulk and electron tunneling outside the solid, as well as by fragmentation of electronically e...

The absorption of radioactive cholesterol tended to be increased, and the catabolism of cholesterol detected by the decay of radioactive cholesterol in the serum after the intraperitoneal injection was delayed in ALR in comparison with normotensive WK rats. The reactive hypercholesterolemia in the ALR which had been selectively bred for a greater hypercholesterolemia was ascribed to the decreas...

Radioactivity is the spontaneous emission of energy from unstable atoms. Radioactive sources have radionuclides. Radionuclide undergoes radioactive decay and emits gamma rays and subatomic particles, constituting the ionizing radiation. The gamma ray energy of a radionuclide is used to determine the identity of gamma emitters present in the source. This paper describes the hardware implementati...

The UVOIR bolometric light curves are usually modeled by the radioactive decay. In order to model more precisely the absolute/apparent magnitude versus time relationship the continuous production of radioactive isotopes is introduced. A differential equation of the first order with separable variables is solved.

The term beta-beam has been coined for the production of a pure beam of electron neutrinos or their antiparticles through the decay of radioactive ions circulating in a storage ring. This concept requires radioactive ions to be accelerated to a Lorentz gamma of 150 for He and 60 for Ne. The neutrino source itself consists of a storage ring for this energy range, with long straight sections in l...

Aging effects in plutonium metal are of metallurgical and practical interest. The Dismantlement Program has provided a wide variety of plutonium samples from a large number of retired nuclear weapons , enabling the development of a comprehensive database of materials properties as a function of age. Data are providing a substantive statistical foundation for these properties as well. The primar...

Radon is a noble gas formed from the natural radioactive decay of uranium (U) and thorium (Th), natural components of the earth’s crust, which decay to radium (Ra) and then to radon (Rn). Decay chains include Ra and Rn for U; Ra and Rn for U; and Ra and Rn for Th. As radium decays, radon is formed and released into pores in the soil. Fissures and pores in the substrate allow the radon to migrat...