PLS-ZK-06 Optically stimulated luminescence irradiation detector 光释光辐照检测仪

 Product Description: 

       The PLS-ZK-06 Optically stimulated luminescence (OSL) irradiation detector is a portable food screening system used for rapid detection or screening of whether food or its components have been irradiated. It can detect herbs, spices and seasonings, fruits and vegetables (including dehydrated vegetables), and products containing shells or bone fragments, such as crustaceans and meat. It is the recommended instrument in the current EU standard method for detecting irradiated food (EN13751-2002) (Note: EU standard EN13751 has now been accepted by the Codex Alimentarius Commission as a global standard for detecting irradiated food), and it is also the primary instrument used by many European and American countries, as well as Japan, to test the irradiation level of imported food (i.e., determining whether food has been irradiated by measuring the PSL signal intensity).

         The PLS-ZK-06 Optically stimulated luminescence (OSL) irradiation detector consists of a pulsed excitation source, a sample chamber, a detection probe, a patented photon counting system (UK Patent No. 2291707), and a control unit. It is very easy to operate, suitable for both laboratory use and portable field measurements. Using the accompanying software, it can also be connected to a computer for data acquisition and processing.

          The patented photon counting technology significantly improves detection sensitivity, enabling direct sample detection without tedious and time-consuming pretreatment. This system is particularly suitable for detecting herbs, spices, and seasonings, and can also be used for fruits and vegetables, as well as products containing shells or bone fragments, such as crustaceans and meats. In fact, the system is applicable to a wider range of foods.

          During measurement, simply place the sample in a covered petri dish and then insert it into the sample chamber. No sample preparation is required for direct measurement. The non-contact measurement process makes it very convenient to detect different types of food without worrying about cross-contamination. Screening detection takes only 15 seconds; the test results are indicated by corresponding indicator lights. For irradiated herbs and spices, the single-pass detection accuracy is over 95%.

The instrument offers two operating modes:

Computer-connected operation—When connected to a computer, measurement parameters (such as measurement time, threshold standards, and data recording conditions) can be customized via software. This allows for obtaining specific photon counts for the sample, measuring dark counts (photon count rate in the sample chamber without light stimulation), empty chamber counts (count rate without a sample to determine sample chamber contamination), and photomultiplier tube sensitivity testing, among other things. It can also perform PSL calibration measurements for samples with uncertain screening results.

Compared to other methods for detecting irradiated food, this method has several significant advantages:

• No sample pretreatment required—Most samples can be measured simply by placing them in a petri dish. Thermoluminescence (TL) methods require complex sample pretreatment, often taking several days, thus the measurement cycle for a single sample typically exceeds one week.
• Simple operation—Results are available in just 15-60 seconds after pressing a button.
• High accuracy – For example, the accuracy rate for a single test of irradiated herbs and spices exceeds 95%.
• Wide applicability – It can detect the vast majority of food products, making it the most widely applicable method among all irradiated food testing methods.
• Clean and environmentally friendly – ​​No chemical reagents are required. Methods such as thermoluminescence (TL) require many toxic and harmful chemical reagents.
• Cost-saving – Because no sample pretreatment is required, daily testing costs are very low.
• Portable – Convenient for on-site measurement or sharing between different laboratories.

1. 产品介绍

         PLS-ZK-06光释光辐照检测仪是一款可方便移动的辐照食品筛查系统，用于快速检测或筛查食品或其成分是否受过辐照。可检测的范围包括草药、香辛料及调味品，水果及蔬菜（包括脱水蔬菜），以及甲壳类动物和肉类等带有贝壳或骨碎片的产品。是目前欧盟检测辐照食品的标准方法（EN13751-2002）中推荐使用的检测仪器（注：欧盟标准EN13751目前已经被食品法典委员会—Codex Alimentarius Commission—接受作为一个检测辐照食品的世界标准），同时也是许多欧美国家及日本等在检测进口食品辐照水平时主要使用的仪器 （即通过测量食品的PSL信号强度判断其是否受过辐照）。

          PLS-ZK-06光释光辐照检测仪由脉冲激发光源、样品室、检测探头、专利的光子计数系统 （UK Patent No 2291707）及控制单元组成，操作非常简单，既可以在实验室使用，也可以携带进行现场测量。利用配套软件，也可与计算机联用进行数据采集和处理。

   专利的光子计数技术极大地提高了检测的灵敏度，使得对样品的直接检测变得可能而无需繁琐耗时的前处理。该系统特别适合于检测草药、香辛料及调味品，也可用于检测水果和蔬菜，以及甲壳类动物和肉类等带有贝壳或骨碎片的产品。事实上，在更广泛的食品范围内，该系统也是适用的。

   测量时只需将样品放入带盖培养皿中，然后送入样品室即可。样品不需要制备即可直接测量。非接触式的测量过程使得不同类型的食品的检测非常方便，而不用担心交叉污染。筛查检测只需15秒钟；测试结果会有相应的指示灯指示。对于辐照过的草药和香料等样品，一次性正确检出率在95%以上。

• 该仪器有两种操作模式可以选择：

    与电脑连接使用——当与电脑连接使用时，可以通过软件自定义测量参数（例如测量时间、阈值标准和数据记录条件等等），可以获得样品具体的光子计数，可以测定暗计数（无光刺激时样品室的光子计数率）、空室计数（无样品时的计数率，以了解样品室是否污染），以及光电倍增管灵敏度测试等等。并可以对筛查结果不确定的样品进行校正PSL测定等等。

与其它辐照食品检测方法相比，该方法有许多突出优点：

• 样品无需前处理——绝大多数样品取样后放入培养皿中即可测量。而热释光（TL）方法需要对样品进行复杂的前处理，一般的样品前处理时间往往需要几天，因此测定一个样品的周期通常都要超过一周。
• 操作简单——按下按钮后仅需15-60秒就可得到结果。
• 准确率高——以辐照过的草药和香料为例，一次检测正确率在95%以上。
• 适用面广——绝大多数的食品均可检测，是所有辐照食品检测方法中适用最广的一种。
• 清洁环保——无需任何化学试剂。而热释光（TL）等方法要用到许多有毒有害化学试剂。
• 节省开支——由于无需样品前处理，日常检测费用很低。
• 携带方便——便于现场测量或不同实验室之间共用。

2. 主要技术参数

• 灯源：激发光源为红外光，8个灯源圆形平均排列
• 自动进样：软件一键式操作，样品放入样品槽后，可以通过软件自动进入设备检测，检测结束后抽屉自动打开

    可用于环境剂量监测和个人剂量监测，可以测读氧化铍及三氧化二铝的光释光探测器，测读剂量范围：0.01mSv-10Sv；

• 暗计数：无光刺激时(关闭光窗)PSL值＜50cps；
• 空白样品皿计数：测试空白样品皿的PSL值＜700cps；
• 阴性参考物计数：称取约2g未经辐照的辣椒粉参照物，测试PSL值＜700cps；
• 阳性参考物计数：称取约2g经辐照的辣椒粉参照物，测试PS值＞5000 cps；