Investigating the performance of polytetrafluoroethylene solid free radical dosimeter

样品 Sample	重量/ mg Weight	标准物质信号 / a.u. Standard material signal	剂量计信号Hpp / a.u. Dosimeter signal	响应 / mg^-1 Response	信噪比 / dB Signal-to-noise ratio	腔内温度 / ℃ Intra-cavity temperature
1	63.00	5 914.61	18.29	0.29	50.84	32.25
2	63.80	5 901.03	25.17	0.39	70.86	32.21
3	63.60	5 912.09	19.36	0.31	51.69	32.19
4	63.60	5 903.81	23.54	0.37	51.70	32.15
5	63.90	5 915.31	31.95	0.50	47.66	32.12
6	63.40	5 905.64	29.42	0.47	43.89	32.10
7	63.60	5 901.41	27.12	0.42	59.57	32.08
8	63.90	5 910.13	27.18	0.43	72.41	32.06
9	63.20	5 901.41	19.79	0.31	55.70	32.16
10	63.00	5 899.51	27.58	0.44	76.645	31.89
均值 Average	63.50	N/A	24.94	0.39	58.10	N/A

Table 2. PTFE dosimeter flipping uncertainty test data table

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Table 2. PTFE dosimeter flipping uncertainty test data table

样品 Sample	旋转角度 Rotation angle	剂量计信号Hpp / a.u. Dosimeter signal	响应 / mg^-1 Response	响应均值 ${\bar{d}}_{i}$ / mg^-1 Average response intensity	标准偏差 $S D_{i}$ Standard deviation
1	0°	25 457.52	382.41	381.98	0.38
	90°	25 441.99	381.69
	180°	25 443.68	381.64
	270°	25 448.05	382.18
2	0°	26 143.66	392.68	392.68	0.67
	90°	26 115.58	392.24
	180°	26 135.29	392.19
	270°	26 233.71	393.62
3	0°	26 415.28	396.42	397.05	1.16
	90°	26 435.03	396.57
	180°	26 414.78	396.43
	270°	26 532.23	398.78
4	0°	26 090.45	391.44	392.34	0.97
	90°	26 100.86	391.75
	180°	26 129.13	392.57
	270°	26 194.38	393.61
变异系数 Coefficient of variation^[14] $C V % = \{{[\sum (n_{i} - 1) (S D^{2} / {\bar{d}}_{i}^{2})]}^{1 / 2} / [\sum (n_{i} - 1)]\} \times 100 %$				0.06%

Table 3. Uncertainty test data for PTFE dosimeter flip

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Table 3. Uncertainty test data for PTFE dosimeter flip

样品 Sample	翻转前后 Flip top to bottom	剂量计信号Hpp/ a.u. Dosimeter signal	响应 / mg^-1 Response	响应均值 ${\bar{d}}_{i}$ / mg^-1 Average response intensity	标准偏差 $S D_{i}$ Standard deviation
1	之前Before	26 539.26	398.94	398.05	1.25
1	之后After	26 481.60	397.17	398.05	1.25
2	之前Before	26 158.24	392.86	393.49	0.89
2	之后After	26 193.12	394.11	393.49	0.89
3	之前Before	26 199.79	393.77	394.51	1.04
3	之后After	26 268.01	395.24	394.51	1.04
4	之前Before	25 441.96	382.15	382.29	0.20
4	之后After	25 447.03	382.44	382.29	0.20
变异系数 Coefficient of variation^[14] $C V % = \{{[\sum (n_{i} - 1) (S D^{2} / {\bar{d}}_{i}^{2})]}^{1 / 2} / [\sum (n_{i} - 1)]\} \times 100 %$				0.12%

Table 4. Comparison of irradiation responses at different dose rates

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Table 4. Comparison of irradiation responses at different dose rates

辐照点位 Radiation point position	剂量计信号Hpp / a.u. Dosimeter signal	吸收剂量 / kGy Absorbed dose	平均剂量 / kGy Average dose	偏差[(A-B)/B] /% Deviation [(A-B)/B]
静态吸收剂量率范围3.0~4.0 kGy/h Static absorbed dose rate range	10 053.15	14.00	A 13.94	0.61
	10 043.55	13.96
	9 929.96	13.59
	10 124.68	14.22
动态吸收剂量率范围2.7~122.2 kGy/h Dynamic absorbed dose rate range	10 106.37	14.10	B 13.86
	10 047.35	13.93
	10 001.67	13.81
	9 936.78	13.59

Table 5. Uncertainty analysis of PTFE dosimeter

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Table 5. Uncertainty analysis of PTFE dosimeter

不确定度分量Uncertainty components	A / %	B / %
校准曲线拟合Calibration curve fitting	2.12
剂量计重复性PTFE dosimeter repeatability PTFE	0.20
溯源不确定度Traceability uncertainty		1.15
参考标准剂量计和校准剂量计在剂量上的差异 Dose difference between reference standard dosimeter and calibration dosimeter		0.34
红宝石信号修正Ruby signal correction		0.27
剂量计重量称量偏差Dosimeter weight measurement deviation		0.45
旋转影响Dosimeter weight measurement deviation	0.06
翻转影响Flip effect	0.12
开始温度修正Initial temperature correction		0.10
结束温度修正Final temperature correction		0.12
方和根法合并A类/B类不确定度 The square and root methods combine Class A/Class B uncertainty	2.13	1.32
合成不确定Combined uncertainty	2.51
扩展不确定度(k=2) Expanded uncertainty	5.02

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Jingfeng CHANG, Guanghua ZHANG, Guozhong WU, Rongfang SHEN, Kaifeng DONG, Kanghai ZHENG. Investigating the performance of polytetrafluoroethylene solid free radical dosimeter[J]. Journal of Radiation Research and Radiation Processing, 2024, 42(6): 060209

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