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Outline
The continuously discriminative monitoring of radon and thoron is a significant project in the realm of radiation protection, which can provide statistical supports for the accurate estimation of internal exposure dose in radon-thoron hybrid environment. Using the improved ZnS scintillation cells and based on the delay count method (DCM), an experimental device for radon-thoron continuous monitoring has been devised. This device has been tested under both laboratorial and on-site conditions, the measurement results from this device were compared with that from Alpha Guard DF2000. As a result, the deviations of the measurement values of this device and Alpha Guard DF2000 are less than 10% for both radon and thoron even when the radioactive concentrations of radon and thoron differ drastically (the ratio is over 1∶30), besides, the disturbance from the previous sampling durations upon the long-term monitoring values has been eliminated. To conclusion, this device is capable to discriminate radon and thoron accurately under distinctively different concentrations of radon and thoron.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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