Absolute measurement of absorbed dose to water for γ-ray of <sup>60</sup>Co by water calorimetry

不确定度来源Source of uncertainty	相应值Value	相对标准不确定度 Relative standard uncertainty
不确定度来源Source of uncertainty	相应值Value	s_i100	u_j100
量热计重复性Reproducibility of calorimeter response	―	0.18	―
热敏电阻校准Thermistor calibration	―	0.19	―
热敏电阻位置Thermistor position	―	―	0.06
热损k_HD Chemical heat defect	1.000 0	―	0.30
水比热容C_w Specific heat of water / (Jg∙K)^-1	4.204 8	―	0.01
热对流k_v Heat flow by convection	1.000 0	―	0.01
热传导k_c Heat flow by conduction	0.996 3	―	0.15
不同温度下水的密度不同k_ρ Water density	1.000 6	―	0.01
辐射场扰动k_p Field perturbation	1.002 1	0.05	―
辐射场不均匀性k_dd Lateral dose profile	1.002 0	0.10	―
探测器位置k_probe Probes and vessel positioning	1.002 3	―	0.08
辐照时间k_time R adiation time	―	―	0.01
二次求和 Quadratic summation		0.28	0.35
合成相对标准不确定度 Combined relative standard uncetainty in D_w,NIMTT		0.45

Table 2. Physical parameters of the transfer ionization chamber

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Table 2. Physical parameters of the transfer ionization chamber

物理参数 Characteristics		PTW 30013-9915	PTW 30013-9916
尺寸Dimensions	壁厚度 Wall thickness / mm	0.425	0.425
	内径 Internal diameter / mm	6.1	6.1
	腔体长度 Cavity length / mm	23	23
	尖点到有效测量点 Tip to reference point / mm	13	13
电极Electrode	长度 Length / mm	21.2	21.2
电极Electrode	直径 Diameter / mm	1.15	1.15
体积Volume	空气腔 Air cavity / mm³	600	600
壁Wall	材料 Material	PMMA, Graphite	PMMA, Graphite
壁Wall	密度 Mensity / kg∙m^-3	1 190, 1 850	1 190, 1 850
高压Voltage	正电荷 Positive charge collected / V	300	300

Table 3. Calibration factors N_D,w,lab relative standard uncertainty of NIMTT and NRC

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Table 3. Calibration factors N_D,w,lab relative standard uncertainty of NIMTT and NRC

相对标准不确定度 Relative standard uncertainty	NIMTT		NRC
相对标准不确定度 Relative standard uncertainty	s_i100	u_i100	s_i100	u_i100
N_D,w,lab相对标准不确定度 Relative standard uncertainty of N_D,w,lab	0.55		0.45
水吸收剂量Absorbed dose to water	0.28	0.35	—	—
电离室电离电流 Ionization current of each transfer chamber	0.04	0.30	—	—
水深度Depth in water	—	0.05	—	—
T, P修正Correction T, P	0.05	0.10	—	—
合并Quadratic summation	0.29	0.47	—	—

Table 4. Calibration factors and E_n values for NIMTT and NRC ionization chambers

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Table 4. Calibration factors and E_n values for NIMTT and NRC ionization chambers

实验室 Laboratory	电离室型号 Ionization chamber type	编号 Number	N_D,w / mGy∙(nC)^-1	相对不确定度k=2 Relative uncertainty k=2	E_n	R_D,w	u_c
NRC	PTW30013	9915	53.67	0.9%	―	―	―
NRC	PTW30013	9916	53.70	0.9%	―	―	―
NIMTT	PTW30013	9915	53.40	1.1%	-0.36	0.995 0	0.007 1
NIMTT	PTW30013	9916	53.36	1.1%	-0.45	0.993 7	0.007 1

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Qian YANG, Jie FAN, Shimeng XU. Absolute measurement of absorbed dose to water for γ-ray of ⁶⁰Co by water calorimetry[J]. NUCLEAR TECHNIQUES, 2024, 47(7): 070202

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Paper Information

Category: Research Articles

Received: Apr. 9, 2024

Accepted: --

Published Online: Aug. 27, 2024

The Author Email: FAN Jie (范杰)

DOI:10.11889/j.0253-3219.2024.hjs.47.070202

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. NIMTT measurement uncertainty of absorbed dose to water for gamma ray of 60Co

Table 1. NIMTT measurement uncertainty of absorbed dose to water for gamma ray of 60Co

Table 2. Physical parameters of the transfer ionization chamber

Table 2. Physical parameters of the transfer ionization chamber

Table 3. Calibration factors ND,w,lab relative standard uncertainty of NIMTT and NRC

Table 3. Calibration factors ND,w,lab relative standard uncertainty of NIMTT and NRC

Table 4. Calibration factors and En values for NIMTT and NRC ionization chambers

Table 4. Calibration factors and En values for NIMTT and NRC ionization chambers

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Table 1. NIMTT measurement uncertainty of absorbed dose to water for gamma ray of ⁶⁰Co

Table 1. NIMTT measurement uncertainty of absorbed dose to water for gamma ray of ⁶⁰Co

Table 3. Calibration factors N_D,w,lab relative standard uncertainty of NIMTT and NRC

Table 3. Calibration factors N_D,w,lab relative standard uncertainty of NIMTT and NRC

Table 4. Calibration factors and E_n values for NIMTT and NRC ionization chambers

Table 4. Calibration factors and E_n values for NIMTT and NRC ionization chambers