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首页> 外文期刊>Review of Scientific Instruments >Gamma‐Ray Scintillation Spectrometer with Logarithmic Pulse‐Height Response
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Gamma‐Ray Scintillation Spectrometer with Logarithmic Pulse‐Height Response

机译：具有对数脉冲高度响应的伽马射线闪烁光谱仪

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Practical use of scintillation spectrometers is unnecessarily complicated by the strong predominance of small pulses encountered especially in measuring complex spectra. The difficulties arising from this general trend can be reduced by deforming the pulse spectra before recording them in a conventional linear pulse‐height analyzer. A discussion of energy dispersion obtained with different types of deformation shows that a logarithmic transformation not only multiplies the counting rates of the original spectrum with a factor proportional to energy, but at the same time increases the energy band which can be resolved with a given number of counting channels. The reduction of counting rate extremes obtained by such a transformation permits attainment of higher total counting speeds with given multichannel equipment (assuming equal scaling factors in all channels); on the other hand, it facilitates accurate intensity measurements using photographic recording techniques. An electronic circuit is described, which accepts input pulses having a sharp rise (≪1 μsec) and produces, 30 μsec later, a dc voltage in linear relationship with log [input pulse height]. The 100‐v range of the output voltage is adjustable to cover pulse‐height ratios from 1:2 up to 1:50. Gray‐wedge spectrograms of the γ rays from Ra taken with the usual linear and with the new logarithmic circuit are presented. Theoretical calculations, as well as measurements with various calibration sources show that the photopeak counting efficiency of a NaI spectrometer becomes nearly constant over a wide energy range when the logarithmic energy transformation is introduced.
机译：闪烁光谱仪的实际使用由于在测量复杂光谱时遇到的小脉冲的强烈优势而不必要地复杂化。可以通过在常规线性脉冲高度分析仪中记录脉冲频谱之前对脉冲频谱进行变形来减少由这种总体趋势引起的困难。对通过不同类型的变形获得的能量色散的讨论表明，对数变换不仅将原始光谱的计数率乘以与能量成比例的因子，而且同时增加了能带给定数可解析的能带计数渠道。通过这种转换减少计数极限值的极限，可以在给定的多通道设备下实现更高的总计数速度（假设所有通道中的缩放比例相等）；另一方面，它有助于使用照相记录技术进行准确的强度测量。描述了一种电子电路，该电路接受具有急剧上升（≪1微秒）的输入脉冲，并在30微秒后产生与log [输入脉冲高度]成线性关系的直流电压。输出电压的100-v范围是可调的，以覆盖从1：2到1:50的脉冲高度比。给出了用常规线性和新对数电路拍摄的来自Ra的γ射线的灰度楔形谱图。理论计算以及使用各种校准源进行的测量表明，当引入对数能量转换时，NaI光谱仪的光峰计数效率在很宽的能量范围内变得几乎恒定。

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