加热方式 Heating mode | 热传导、对流和辐射原理使热量从外部传至物料内部(存在温度梯度,故加热的物料不均匀) Heat is transferred from the outside to the inside through three ways: heat conduction, convection, and radiation (Temperature gradient leads to uneven heating) | 被加热体内部偶极分子高频往复运动,产生“内摩擦热”,物料内外部同时加热和升温(加热速度快且均匀) Material is heated by 'internal friction heat', caused by high frequency reciprocating motion of dipole molecules inside the heated body. Material internal and external heating and heating-up at the same time (heating speed is fast and uniform) |
制样时间和效率 Sample preparation time and efficiency | 制样时间较长,单个样品约2~6周,劳动强度大 Sample preparation time is long, 2 ~ 6 weeks for a single sampling process, higher labour intensity | 制样时间缩短,单个样品约1~2周,制样效率高 Sample preparation time is shortened, 1 ~ 2 weeks for a single sample preparation, high sample preparation efficiency |
温度控制 Temperature control | 电炉(含电炉丝)不能定量控制温度 Electric furnace (including electric wire) cannot control temperature quantitatively | 测温元件热电偶,可控制干燥、碳化和灰化各个阶段的温度,使得温度不超过400 ℃ Thermocouple used for temperature measuring element. Able to control temperature in various stages of the drying, carbonization and ashing, temperature does not exceed 400 ℃ |
核素损失可能性 Nuclide loss probability | 大(炒锅底部长时间高温容易凸凹变形,收集转移可能会损失)Large (the bottom of the frying pan is prone to convex and concave deformation. Loss could be happen during collection and transfer) | 小(石英玻璃坩埚,灰样可全部收集) Small (quartz glass crucible, ash samples can be fully collected) |
样品处理量 Sample handling capacity | 较大 The larger | 大(油脂类样品除外) Large (except for oil samples) |
沾污可能性 Contamination possibility | 小(通风橱易结垢油污,清洗难度大) Small (ventilation cabinet is easy to scale oil, cleaning is difficult) | 无(石英坩埚易清洗,且含油烟回收系统) No (quartz crucible is easy to be cleaned, and oily smoke recovery system is integrated) |
对设备腐蚀性 Corrosivity to equipment | 小(海洋生物腐蚀铁制品) Small (marine biological corrosion of iron products) | 无 No |
安全系数 Safety factor | 低(容易着火) Low (easy to catch fire) | 高(碳化阶段不通氧气,不易着火) High (no oxygen in the carbonization stage, not easy to catch fire) |
健康危害程度 Health hazard degree | 高,对呼吸道有刺激 High, irritating to the respiratory tract | 无(全封闭式,含净化装置) No (fully enclosed, with purification device) |
设备操作 Equipment operation | 操作工序繁琐,需3种设备完成干燥、碳化和灰化等前处理工序 Operation process is complicated, and three kinds of equipment are needed to complete the pretreatment process such as drying, carbonization and ashing | 操作简单,自动升降,一键启动,全过程无需人员值守 The equipment is easy to be operated, automatic lifting, one key start, Unattended throughout the entire process |
设备费用 Equipment cost | 较贵,电消耗量大 More expensive, larger power consumption | 较便宜,电消耗量低 Cheaper, lower power consumption |
测量准确度 Measurement accuracy | 较高(长半衰期放射性核素) High (long half-life radionuclides) | 高(长、短半衰期放射性核素) High (long and short half-life radionuclides) |
适用范围 Scope of application | 长半衰期核素 Long half-life nuclides | 短、长半衰期核素 Short and long half-life nuclides |