论文标题
使用CMOS传感器迈向低成本的铅测定技术
Towards a low cost lead assay technique for drinking water using CMOS sensors
论文作者
论文摘要
估计低收入和中等收入国家有2600万人有铅暴露的风险，并且没有安全摄入的安全阈值。无线电测定方法在处于危险中的区域不容易访问，因此需要低成本和易于使用的传感器。 $ \ textrm {pb} $与衰减能量的痕迹一起出现，范围为$ 10 $，几个\ si {100} {\ kilo \ electronvolt}及以后。在硅传感器中可以访问此类能量。我们已经测试了针对光波长优化的科学CMO（NEO 5.5 SCMO），为$γ$检测器的辐射范围为$ 0 $ $ 0 $，至几个KeV。我们发现一个最小可检测到的$^{241} \ textrm {am} $衰减率为<1.4h的测量值20 bq。优化我们的分析软件将有可能在相同的测量时间内检测较低的速率。我们确定NEO 5.5 SCMO允许测量$^{241} \ textrm {am} $衰减线的光谱。此外，我们表明，通过煮沸减少水的体积时，可以提高水分中的放射性同位素浓度。使用科学CMOS传感器获得的知识将作为智能手机中的芯片转移到商业硅传感器。
An estimated 26 million people in low- and middle-income countries are at risk of lead exposure and there is no safe threshold for lead ingestion. Radio assay methods are not easily accessible in regions at risk, therefore a low cost and easy to use sensor is desirable. $\textrm{Pb}$ occurs together with traces of radioisotopes with decay energies in the range of $10$ to several \SI{100}{\kilo\electronvolt} and beyond. Such energies are accessible in silicon sensors. We have tested a scientific CMOS (Neo 5.5 sCMOS), optimised for optical wavelengths, as $γ$ detector for radiation in the range of $0$ to a few 10 keV. We find a minimal detectable $^{241}\textrm{Am}$ decay rate of 20 Bq for a < 1.4h measurement. Optimising our analysis software will potentially enable detecting lower rates in the same measurement time. We established that the Neo 5.5 sCMOS allows to measure a spectrum of $^{241}\textrm{Am}$ decay lines. In addition we show that it is possible to enhance the concentration of radioisotopes in water when reducing the water's volume by boiling. The knowledge gained using the scientific CMOS sensor will be transferred to commercial silicon sensors as the chips in smart phones.
