Acta Physica Sinica, Volume. 69, Issue 14, 145202-1(2020)
Figures & Tables(10)
Fig. 1. The abridged general view of the fluence measurement system for pulse hard X-ray.
Fig. 2. The block diagram of the calibration platform composition.
Table 1. The parameter comparison of several common high density scintillators.
View tableView in ArticleTable 1. The parameter comparison of several common high density scintillators.
闪烁体 最强发射波长/nm 闪烁衰减时间/ns 折射率 密度/g·cm–3 相对光输出/% Bi4Ge3O12 480 300 2.15 7.13 12.0—14.0 BSO 480 2/30/100 2.06 6.80 2.0—5.0 LSO:Ce 420 40 1.82 7.40 75.0 PbWO4 480 10 2.16 8.20 0.5—1.0 GSO:Ce 450 31/65 1.90 6.71 20.0 ZnWO4 480 5000 2.20 7.87 26.0 CdWO4 540 5000 2.30 7.90 40.0 CaWO4 540 5000 2.30 7.90 40.0
Table 2. The transmissivity of the photon transmitting scintillators of different thicknesses.
View tableView in ArticleTable 2. The transmissivity of the photon transmitting scintillators of different thicknesses.
Thicknesses of scintillators /mm 0.01 10.00 15.00 20.00 25.00 30.00 35.00 Transmissivity/% 97.8200 1.9970 0.8750 0.4440 0.2270 0.1200 0.0695
Table 3. Sensitivity of the detector at different energies.
View tableView in ArticleTable 3. Sensitivity of the detector at different energies.
靶材 光谱仪电压/kV 光谱仪电流/mA X射线能量/keV 本底电流/nA 输出电流/nA 剂量率/mGy·s–1 灵敏度/10–17 C·cm2·MeV–1 Pb 100 25 75.0 3.9 24.2 8.78 5.29 W 95 30 59.2 2.2 11.9 3.25 6.79 Dy 75 35 46.0 3.7 29.4 50.77 3.87 Sn 50 60 25.3 3.9 26.7 55.77 3.13
Table 4. Measurement results of energy fluence in five successive experiments.
View tableView in ArticleTable 4. Measurement results of energy fluence in five successive experiments.
发次 二极管电压/kV 二极管电流/kA 剂量/rad 能注量/mJ·cm–2 1 705 311 415.6 36.0 2 741 315 342.4 35.0 3 686 323 293.4 37.0 4 746 327 309.3 36.6 5 718 305 325.6 34.8 平均值 719.2 ± 25.0 316.2 ± 8.9 337.3 ± 47.4 35.9 ± 1.0
Table 5. Theoretial values of pulsed hard X-ray energy fluence.
View tableView in ArticleTable 5. Theoretial values of pulsed hard X-ray energy fluence.
能量/keV 15 30 60 90 120 150 能谱归一化数值 0.1174 0.2260 0.2110 0.1465 0.1104 0.0865 质能吸收系数/cm2·kg–1 9790 4080 143 69 69 69 能注量/ mJ·cm–2 0.04761 0.21996 5.85906 8.43404 6.35475 4.97756 能量/keV 180 210 300 400 500 600 能谱归一化数值 0.0533 0.0319 0.0103 0.0036 0.0021 0.0004 质能吸收系数/cm2·kg–1 29.1 29.1 29.1 29.1 29.1 29.1 能注量/ mJ·cm–2 7.27554 4.36081 1.41793 0.49708 0.29262 0.06403
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Zhao-Feng Su, Ding-Guo Lai, Meng-Tong Qiu, Qi-Fu Xu, Shu-Qing Ren.
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Received: Nov. 7, 2019
Accepted: --
Published Online: Dec. 28, 2020
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