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English Posts

Ramsauer-Townsend Effect

In this post we describe a particular characteristic curve of a vacuum tube that allows to estimate the size of an atom of a noble gas. The Ramsauer – Townsend effect consists in the reduction of the cross section when electrons with around 1 eV energy collide atoms of inert gases …

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PSoC Coincidence Detector – III

We continue the series of posts about PSoC describing the application of the coincidence detection circuit  to the case of cosmic rays. These have been treated in numerous articles and so here we simply expose the results we obtained using the PSoC-based coincidence detector. The system has been connected to two SiPM detectors …

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PSoC Coincidence Detector – II

We continue the post “PSoC Coincidence Detector – I” describing the application of the coincidence detector system for the detection of radiation produced by the decay of isotope Na22. This topic has already been addressed in the following previous post : Positron Annihilation Entangled Gamma Photons For full details about positron and entanglement …

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PSoC Coincidence Detector – I

In this post we describe an application of PSoC component having the aim to realize a high-precision coincidence detection circuit  to be applied in the detection of nuclear signals. PSoC (Programmable System-on-Chip) is a family of microcontroller integrated circuits by Cypress Semiconductor. These chips include aCPU core and mixed-signal arrays of …

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Fluorescence Lifetime

In this post we explore with some detail the phenomena of fluorescence. This topic has already been presented in the previous post : What is Fluorescence.  As already explained, fluorescence is the property of some substances to re-emit (in most cases at longer wavelength so at lower energy) the received electromagnetic radiation, in particular they absorb the …

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“Punta Ekar” Telescope

In this post we describe our visit to the telescope of Ekar peak in Asiago : 182cm main mirror, the largest on the Italian territory. The telescope is located at Ekar peak (about 1400 mslm) near the town of Asiago but away from artificial light sources. In the picture below …

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Porphyrins : the Colors of Life

Porphyrins are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). The parent porphyrin is porphin, and substituted porphines are called porphyrins. The porphyrin ring structure is aromatic, with a total of 26 electrons in the …

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Photon Counting

The corpuscular nature of the light can be detected by means of the photon counting technique, realized with a photomultiplier tube. The “photon counting” technique has already been described in the post Light as a Particle, in which we used a special photon counter and a pulsed light source. In this …

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DIY Acrylic Cherenkov Detector

In this post we propose the construction of a cosmic rays Cherenkov detector based on a radiator made of a transparent acrylic plastic block. In this site we have already described a water Cherenkov detector, in which the radiating material was formed by the water contained in a dewar vessel. For the …

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Radioactive Electronic Tubes

There are some electronic tubes that contain small quantities of radioactive materials to enhance the internal ionization processes. Such tubes have been used in the 20th century mostly in radar technology. Some of these tubes contain small quantities of Cesium-137, Cobalt-60, Radium-226, Krypton-85. The radioactive elements have been added to increase …

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