1/1/2023 0 Comments Homem alpha pdf![]() This approach is based on the use of a novel device consisting of a boron doped nanocrystalline diamond film deposited onto a silicon PIN diode alpha particle sensor. ![]() We report here on a new approach for the detection and identification of actinides (Pu, Am, Cm, etc). We believe this can be of very high interest for alpha spectroscopy in liquids for trace detection. This study demonstrated that alpha particles spectroscopy measurements could be practically performed, for the first - ime, in media composed of aqueous solutions after electrochemical deposition process, with detections limits reaching 0.24 Bq/L. The diamond/silicon sensor shows also very high spectroscopic stability after 30 cycles of sensing with precipitation/decontamination loops. the deposited 241Am electroprecipitated layer can be rapidly removed by applying an anodic current (+ 2 mA/cm2 for 10 minutes) to the electrode in aqueous solution. The diamond/silicon sensor can be reused after measurement using fast decontamination at high yields ≥ 99 %: e.g. The efficiency of the deposition was significantly improved with efficiency values reaching for example up to 81.5 % for the electroprecipitation of 5.96 Bq of 241Am on the diamond/silicon sensor. The approach is based on the fine tuning of the pH of the electrolyte, the nature of the supporting electrolytes Na2SO4 and NaNO3, the geome1try of the electrochemical cell, the current density value, the precipitation duration and the sensor area. Here we present recent progress addressing the optimization of the actinides electroprecipitation step on the diamond/silicon sensor. This work demonstrated that the detection of alpha particles is made feasible directly in liquid media. The device enables to directly probe both alpha activity as well as energy in liquid solutions. In our devices, actinides collection is performed using a novel method based on electroprecipitation that can be carried out in the solution itself via the use of a doped diamond electrode. ![]() We have presented a novel approach associating a boron doped nanocrystalline diamond film to a silicon PIN diode alpha sensor. Conventional techniques consist of electrodepositing alpha emitter species on a surface and counting alpha particles using e.g. Alpha particles detection in liquid media remains challenging since alpha particles are self-absorbed by a few micrometers of liquid. ![]()
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