Influence of interference signals on spectrometer and measurement results in positron annihilation lifetime measurements

Lei WANG; Xionggang PENG; Hongqiang ZHANG; Runsheng YU; Peng ZHANG; Haibiao WU; Yaru WU; Baoyi WANG; Xingzhong CAO; Detao XIAO; Fuyan LIU

doi:10.11889/j.0253-3219.2023.hjs.46.060402

NUCLEAR TECHNIQUES, Volume. 46, Issue 6, 060402(2023)

Influence of interference signals on spectrometer and measurement results in positron annihilation lifetime measurements

Lei WANG^1,2, Xionggang PENG^2,3, Hongqiang ZHANG^2,3, Runsheng YU^2,3, Peng ZHANG², Haibiao WU¹, Yaru WU², Baoyi WANG^2,3, Xingzhong CAO^2,3, Detao XIAO^1、*, and Fuyan LIU^2、**

Author Affiliations

¹School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

²Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

³University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(7)

Fig. 1. Principal scheme of the positron annihilation lifetime spectrometer

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Fig. 2. Positron-lifetime spectrum of pure iron(Fe) in ⁶⁰Co/²²Na with activity radio of 3.3 (color online)

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Fig. 3. Positron-lifetime spectrum of irradiated RPV steel samples (color online)

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Fig. 4. FWHM and FWTM parameter of positron-lifetime spectrum

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Table 1. Resolved results of positron-lifetime spectrum
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Table 1. Resolved results of positron-lifetime spectrum
名称 Type τ₁ / ns I₁ / % $τ_{2}$ / ns I₂ / % χ² 时间分辨 Time resolution / ps
标准谱仪 Standard spectrometer 0.110 98.8 1.588 1.2 1.08 213
搭建谱仪 Experimental spectrometer 0.110 97.8 1.805 2.2 0.97 198

Table 2. Resolved results of pure iron(Fe) positron-lifetime spectrum

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Table 2. Resolved results of pure iron(Fe) positron-lifetime spectrum

名称 Type	$τ_{1}$ / ns	$I_{1}$ / %	$τ_{2}$ / ns	$I_{2}$ / %	$τ_{3}$ / ns	$I_{3}$ / %	$χ^{2}$	PVR/PVR_Na
Fe	0.110	72.8	0.382	25.6	1.805	1.6	0.97	1
Cs/Na 2.2	0.109	74.1	0.382	24.9	1.746	1.0	0.92	0.60
Co/Na 1.9	0.103	78.3	0.369	20.0	1.563	1.7	1.08	0.19
Co/Na 3.3	0.089	82.5	0.343	16.0	1.570	1.5	1.03	0.13

Table 3. Resolved results of RPV steel positron-lifetime spectrum

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Table 3. Resolved results of RPV steel positron-lifetime spectrum

样品名称 Sample

τ_{1}

/ ns

I_{1}

/ %

τ_{2}

/ ns

I_{2}

/ %

τ_{3}

/ ns

I_{3}

/ %

χ^{2}

PVR/PVR_Na

A_Co-60 / MBq

未辐照RPV钢

Non-irradiated RPV

0.145

97.4

―

1.955

2.6

1.04

辐照后RPV(0.5 mm)钢

Irradiated RPV (0.5 mm)

0.120

59.6

0.263

39.0

0.880

1.4

1.01

0.31

1.5

辐照后RPV(1 mm)钢

Irradiated RPV (1 mm)

0.078

47.1

0.216

49.7

0.704

3.2

1.08

0.18

2.8

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Lei WANG, Xionggang PENG, Hongqiang ZHANG, Runsheng YU, Peng ZHANG, Haibiao WU, Yaru WU, Baoyi WANG, Xingzhong CAO, Detao XIAO, Fuyan LIU. Influence of interference signals on spectrometer and measurement results in positron annihilation lifetime measurements[J]. NUCLEAR TECHNIQUES, 2023, 46(6): 060402

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