E′ and Al-hole centres are some of the most common and abundant paramagnetic defects in sedimentary quartz. Here we investigate the dose dependence of these defects before and after exposure to light by electron spin resonance (ESR). Unlike the Al-hole centre, known to have only radiation-induced formation mechanisms, the E′ centre seems to possess a response to gamma dose characterised by predominantly radiation-induced annihilation at lower doses (up to about 1000 Gy) and a predominantly radiation-induced formation at higher doses, at least in the investigated dose range (up to 40 kGy) and samples. We propose these dose response mechanisms to be governed by electron trapping by E′ centre itself and by hole trapping by the oxygen deficiency centre (ODC), that seems to be the main precursor of E’ centre. We show that the ESR signals of both defects are linearly correlated during their formation as well as during their dissociation under both irradiation and sunlight exposure. The amount of E′ formed after light exposure was found to follow a saturating exponential behaviour as function of the annihilated Al-hole concentration in respect to dose, saturation being reached for doses of about 1000 Gy, probably due to the exhaustion of ODC population. As such, we propose that the origin of the unbleachable part of the Al-hole signal resides in the availability of oxygen deficiency centres which is also dependent on the accumulated gamma dose.

E'和Al-空穴中心是沉积石英中最常见和最丰富的顺磁缺陷。在这里，我们研究了通过电子自旋共振（ESR）曝光之前和之后这些缺陷的剂量依赖性。与Al-hole中心只有已知的辐射诱导形成机制不同，E'中心似乎对伽马剂量有反应，其特征是在较低剂量（最高约1000 Gy）下主要由辐射引起的an灭，主要是辐射-至少在所研究的剂量范围（最高40 kGy）和样品中，以较高的剂量诱导了血管生成。我们提出这些剂量反应机制受E'中心自身的电子俘获和氧缺乏中心（ODC）的空穴俘获控制，ODC似乎是E'中心的主要前体。我们表明，两种缺陷的ESR信号在其形成过程中以及在辐射和阳光照射下的解离过程中均呈线性相关。发现在曝光之后形成的E'的量遵循相对于剂量的an灭的Al-空穴浓度的饱和指数行为，对于约1000Gy的剂量达到饱和，这可能是由于ODC总体的耗尽。因此，我们提出Al-hole信号不可漂白部分的起源在于缺氧中心的可用性，缺氧中心也取决于累积的伽马剂量。发现在曝光之后形成的E'的量遵循相对于剂量的an灭的Al-空穴浓度的饱和指数行为，对于约1000Gy的剂量达到饱和，这可能是由于ODC总体的耗尽。因此，我们提出Al-hole信号不可漂白部分的起源在于缺氧中心的可用性，缺氧中心也取决于累积的伽马剂量。发现在曝光之后形成的E'的量遵循相对于剂量的an灭的Al-空穴浓度的饱和指数行为，对于约1000Gy的剂量达到饱和，这可能是由于ODC总体的耗尽。因此，我们提出Al-hole信号不可漂白部分的起源在于缺氧中心的可用性，缺氧中心也取决于累积的伽马剂量。