The calibration of monitors of radon decay products is a difficult task, and even more so in the case of monitors detecting the products of thoron decay. An important issue here is the lack of primary standards, both in relation to the products of radon as well as thoron decay. In Poland, for many years, measurements of potential alpha energy concentration (PAEC) were carried out with the application of special devices, called ALFA probes. These in turn featured thermo-luminescent detectors (TLD), the readout of which provided information about the potential alpha energy, with no dependence on equilibrium or other factors alike. In this paper, we propose modifying this technique, which had been used only for measurements of products of radon decay. We specifically examine how it can be used to allow simultaneous measurements of radon and thoron PAECs.

In employing the method, the idea is to use two sets of TL detectors in the same device during and after sampling. The first set of detectors is used to store the energy of alpha particles during the course and for a short while after the sampling, up to 5 h after its end. Using this method, the first set of detectors holds respectively the full and partial PAECs of products of radon and thoron decay. After that, the first set of TLDs is replaced with a second one. These are then left in the device for another 55–60 h. This set contains only the PAEC from thoron decay products. Afterwards, it is necessary to subtract thoron PAEC from the first set result and add it to the result provided by the second set in order to estimate the PAEC for the products of thoron decay.

On a practical level, using such a procedure can potentially difficult during underground or field monitoring nevertheless. This is why another approach can be adopted as well. This is specifically to leave the device for 60 h after sampling without any changes, the original set of TLDs providing a “total” PAEC readout – this being a sum of radon and thoron PAECs. In this paper, we will explore the value of using such a readout for the measurement that is carried out.

ra衰变产物监测仪的校准是一项艰巨的任务，在监测仪检测detecting降解产物的情况下更是如此。这里一个重要的问题是缺乏关于the的产物以及的衰变的主要标准。在波兰，多年来，通过使用称为ALFA探针的特殊设备进行了潜在α能量浓度（PAEC）的测量。这些反过来又具有热发光检测器（TLD），其读数提供了有关潜在α能量的信息，而与平衡或其他因素无关。在本文中，我们建议修改此技术，该技术仅用于测量decay衰变的产物。

在采用该方法时，其想法是在采样期间和采样之后在同一设备中使用两组TL检测器。第一组检测器用于在整个过程中以及采样后的一小段时间内（直到其结束后最多5小时）存储α粒子的能量。使用这种方法，第一组检测器分别保存ra和衰变产物的全部和部分PAEC。之后，将第一组TLD替换为第二组TLD。然后将它们留在设备中另外55–60小时。该组仅包含来自ron衰变产物的PAEC。此后，有必要从第一组结果中减去thoron PAEC并将其添加到第二组结果中，以估计thoron衰减产物的PAEC。

从实践的角度来看，在地下或野外监控期间，使用这种程序可能会很困难。这就是为什么也可以采用另一种方法的原因。这是为了在采样后将设备放置60小时而没有任何变化，原始TLD组提供了“全部” PAEC读数-这是ra气和thoron PAEC的总和。在本文中，我们将探讨使用这种读数进行测量的价值。