Currently in Peru, UV index levels exceed the maximum allowable value (11+ Extreme). For this reason, it is important to evaluate the effectiveness of sunscreens with different Sun Protection Factor (SPF) ratings, which is a laboratory measure of the sunscreen's efficacy against UV-B radiation on our skin. In this study, the in vitro technique will be used following COLIPA recommendations, which involves measuring the transmission of UV radiation through the cream. The results obtained for the different SPFs are consistent with the values indicated on the product packaging: Bahía-SPF 45, Avon-SPF 50, and Bahía-SPF 70. However, they deviate by 30% from the indicated values for the higher SPFs, specifically Bahía-SPF 90, Bahía-SPF 100, and Unique-SPF 100

Using an Analog Discovery 2 as the basis for the development of an electrical impedance spectroscopy (EIS) kit and the adaptation of the Accu-Chek®test strips as a working electrode to perform readings on samples of human blood tissue, it is possible to obtain the corresponding Nyquist spectra for the mentioned tissue. These results indicate a possible correspondence in the electrical impedance signal observed in people with a hemoglobin amount of 14.8 g/dL, 14.7 g/dL, 14.6 g/dL and 13.7 g/dL. It was also possible to simulate with the data obtained the probable graph of a person with 12.7 g/dL of hemoglobin in blood, which corresponds to a patient with anemia. This article analyzes the viability of developing a new less invasive diagnostic method for anemia disease, which is taking place in the Biophysics Laboratory of the Faculty of Physical Sciences - UNMSM.

Gamma radiation detectors using scintillators continue to be highly relevant in various fields such as the study of radiation in nuclear physics, in environmental radiation measurements, in radiological protection and in industry. The INFISA research group attached to the FCF of the UNMSM, which is located in the Physics Research Institute, has three inorganic solid scintillators of sodium iodide doped with thallium NaI(Tl) with a crystal size of 1.5”x1. 5” (REXON), 2”x2” (TELEDYNE) and 3”x3” (BICRON). In the present work we present the results of the comparison, showing the curves in both efficiency and resolution when characterizing the three scintillators for fine-tuning the detection chain for use in gamma spectroscopy.

The present research has allowed us to determine the X-ray spectrum, for this we have designed a computational program through iterative calculation, samples of attenuation data have been taken and then a previously designed program has been used with a programming language, with the attenuation data. For our case we have worked with the Aluminum and Copper lters. This research has allowed us to: 1.- Find the spectra of X-ray radiation. 2.- Design a program that allows us to nd the X-ray spectra, which we must compare with the X-ray spectra previously determined by Tominaga (1981). 3.- Design a Visual X-ray Dosimetry Program. The expected result is the obtaining of the radiation spectra and the optimization of the X-ray dosimetry, based on the designed program.

Detailed measurements of background radiation in counts per minute (cpm) and dose rates (µSv/h) have been conducted in all the libraries of the National University of San Marcos, located in the University City of Lima, Peru. Radiation measurements were carried out using Geiger-Müller counters to ensure a thorough evaluation of background radiation levels in these educational settings. The results show that the detected radiation levels range between \(14 \pm 1.22\) and \(26 \pm 1.14\) cpm, with an average of \(22 \pm 1.32\) cpm. Additionally, the dose rate values in the libraries range between \(0.16 \pm 0.02\) and \(0.25 \pm 0.03\) \(\mu Sv/h\), with an average of \(0.21 \pm 0.02\) \(\mu Sv/h\). The measurements were conducted in late June and early July 2024, a period of high student concentration due to the proximity of final exams. The facilities of the various libraries span from ...

This research shows the bioelectrical characterization and impedance reading of nasopharyngeal samples taken during the infection stage of a patient with viral rhinopharyngitis compared to the healthy stage of the same patient. 11 nasopharyngeal samples were taken during the initial phase of infection and 10 nasopharyngeal samples 14 days after not presenting any symptoms. The analysis was carried out in a frequency range of 10 kHz - 1 MHz using the MIVA (Module of Variable Impedance for Analysis) bioelectrical impedance equipment. The results obtained indicated a significant difference in the impedance of the samples during the different stages, which allowed establishing a range in the axes (Z' and Z'') of the Nyquist diagram when a nasopharyngeal sample comes from a case of viral rhinopharyngitis and when the sample comes from a healthy patient. In addition, it will be modified to sch...

The present research aims to carry out the analysis of the electrical behavior of the glucose oxidase protein (GOx) and thus be able to establish the parameters to be considered in an impedance equipment to be able to perform hemoglobin readings. From the modification of reagent strips Accu-Chek it was possible to obtain the corresponding GOx readings in 8 samples, which supported the adjustment of the optimal frequency range to be able to perform bioelectric impedance analysis in biological material. The results of the study helped to have a clearer vision to lay the foundations for a future team that aims to detect anemia due to the relationship of GOx with Hemoglobin (HbA1c).