DOI: 10.7795/720.20231026a
title: Novel optical technologies for emergency preparedness and response: mapping contaminations with alpha-emitting radionuclides

description: The files contain the UV photon count rate values and other quantities used for the optical analysis of alpha emitters presented in the corresponding article. For scanning measurements, the photon count rate is reported for each pixel of the image where each pixel designates the particular detector orientation (pitch, yaw) set by goniometer stages. For pointing measurements with detector and the source on the same optical axis, the time series of the photon count rate is reported.
description: - block: Ambient background time series
 research object: Ambient UV background estimation in the conventional office/lab
 method: The measurand is quantified with the lens-based system pointing towards the window. The acquisition system consists of a 240 mm UV fused silica lens, optical filter assembly, photomultiplier tube, pulse counter, and readout computer. The filter and photomultiplier type are selected depending on the measured UV band (UV-A or UV-C) with the component choice specified in the header of each measurement file. The UV photon count rate (in 1/s) is logged with the Hamamatsu C8855 counter in 10-second intervals.
 format: .csv 

 - block: Scanning measurements / images
 research object: Imaging of alpha-emitting sources using radioluminescence
 method: The UV images of alpha sources are taken in the dark with the optical scanning system from the distance of 2 m. The color image, onto which the UV image is superimposed, is taken separately in the well-lit environment with the Intel RealSense D435 depth camera. The acquisition system consisting of a lens-based UV detector and two goniometric stages controlling the pitch and the yaw of the detector. The acquisition system consists of a 240 mm UV fused silica lens, optical filter assembly, photomultiplier tube, pulse counter, and readout computer. The filter and photomultiplier type are selected depending on the measured UV band (UV-A or UV-C) with the component choice specified in the header of each measurement file. The UV photon count rate (in 1/s) is logged with the Hamamatsu C8855 counter in millisecond intervals. Two Newport goniometric stages (M-BGM160PE - pitch, RVS80CC - yaw) are controlled with Newport SMC100 controllers. Finally, two data streams - count rate and detector orientation - are synchronized to produce the UV image where each pixel is characterized by a (pitch, yaw, count rate) vector.
 format: .dat, .jpg

 - block: Radioluminescence spectra
 research object: UV-band spectra of alpha radioluminescence in various gases
 method: The measurand is quantified using the narrow alpha beam stopping in a gas-filled quartz cuvette. The cuvette has the outer diameter of 25 mm and is sealed with an aluminum foil at the beam entrance. The alpha-particle beam has the mean exit energy of 5.1 MeV and the diameter of 100 um. The spectra are taken with the Instrument Systems CAS140D spectroradiometer positioned perpendicular to the beam axis at the Bragg peak height 1 mm from the cuvette surface. The spectral radiance (in uW/(m2 nm)) is reported for acquisition periods (in s) and beam intensities (in 1/s) specified in the header of each measurement.
 format: .csv 

 - block: Counting efficiency of lens systems
 research object: Studying photon count rate of the alpha radioluminescence detectors as a function of beam intensity and luminescent gas composition; comparing the performance of radioluminescence detectors based on UV fused silica and PMMA Fresnel lenses
 method: The measurand is quantified using the narrow alpha beam stopping in a gas-filled quartz cuvette. The cuvette has the outer diameter of 25 mm and is sealed with an aluminum foil at the beam entrance. The acquisition system consists of a lens, optical filter assembly, photomultiplier tube, pulse counter, and readout computer. The lens, filter, photomultiplier type, and pulse counter components are specified in the header of each measurement file. The UV photon count rate (in 1/s) and alpha beam intensity (in 1/s) are logged in 1-second or 10-second intervals.
 format: .csv
description: The project 19ENV02 RemoteALPHA has received funding from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.