A novel alpha spectrum analysis program which combines the Monte Carlo simulations with spectrum fitting is introduced. The shapes used in the fitting are obtained from the simulations. The program is developed especially to analyze complex alpha particle energy spectra – such as those obtained from non-processed aerosol filters, swipe samples or isolated particles emitting alpha radiation. In ...

This paper describes the construction and calibration of the NIST large area x-ray counting system. 238Pu sources 8 in (20.32 cm) by 5 in (12.70 cm) thick, emitting L x rays in the range of 12-20 keV are calibrated for total emission rate and also for rate through a centrally located 3 in (7.63 cm) diameter aperture. Alpha particle emission rates are obtained using the known x-ray to alpha part...

The wave-particle alpha-channeling effect is generalized to include rotating plasma. Specifically, radio frequency waves can resonate with alpha particles in a mirror machine with ExB rotation to diffuse the alpha particles along constrained paths in phase space. Of major interest is that the alpha-particle energy, in addition to amplifying the rf waves, can directly enhance the rotation energy...

The formation of $\ensuremath{\alpha}$ particles on nuclear surfaces has remained a fundamental problem since the dawn physics. This $\ensuremath{\alpha}$-particle strongly affects $\ensuremath{\alpha}$-decay lifetimes heavy and superheavy elements, level scheme light nuclei, synthesis elements in stars. However, despite its importance, medium-mass nuclei is seldom investigated. Based $^{48}\ma...

The spectra of both protons and alpha particles (1 ~ E ~ 7 MeV/nucleon) during 31 recurrent particle streams are fit well by an exponential in particle rigidity. Although the spectra show considerable temporal variation, the proton and alpha particle spectra are correlated such that the e-folding rigidities P0 (a) and P0 (p) of the two spectra are in the ratio P0 (a)/ P0 (p) = 1.5 ± 0.1. The co...

There is a lack of data related to activity uptake and particle track distribution in targeted alpha therapy. These data are required to estimate the absorbed dose on a cellular level as alpha particles have a limited range and traverse only a few cells. Tracking of individual alpha particles is possible using the Timepix semiconductor radiation detector. We investigated the feasibility of imag...