Crosstalk interference and correction methods for low background gas-flow proportional counter

粉末源 Powder source	核素 Radionuclide	β粒子平均能量 / keV Average energy ofβ	活性区域直径 / mm Dimension of active surface	串道比*χ_β→α / % Crosstalk ratio χ_β→α
CaCO₃	¹⁴C	49.5	20	0.060±0.002
Cs₃Bi₂I₉	¹³⁷Cs	174	20	0.042±0.002
SrCO₃	⁹⁰Sr（⁹⁰Y）	195.8（933.6）	20	0.016±0.001
KCl	⁴⁰K	560.18	20	0.004 0±0.000 2

Table 3. α-to-β crosstalk ratio for α planar standard sources

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Table 3. α-to-β crosstalk ratio for α planar standard sources

平面源 Planar source	主要辐射方式、辐射能量及分支比 Main radiations and decay energy	活性区域直径 / mm Dimension of active surface	源强度（表面发射率） / (min∙2πsr)^-1 Surface emission rate in 2π steradian	串道比χ_α→β/ % Crosstalk ratio χ_α→β
²⁰⁹Po*	<α>4883 keV, 79.24% <α>4885 keV, 19.71% <α>4622 keV, 0.55% <γ>260.5 keV, 0.254% <γ>896.28 keV, 0.445%	23	/	3.77±0.27
²¹⁰Po	<α>5304 keV, 100%	35	2.188×10⁴	3.49±0.11
²³⁹Pu	<α>5157 keV, 70.77% <α>5144 keV, 17.11% <α>5105 keV, 11.94% <γ>12.975 keV, 0.034% <γ>51.624 keV, 0.027%	20	5.70×10²	7.34±0.38
²³⁹Pu-²⁴¹Am	/	20	²⁴¹Am：19.0 Bq; ²³⁹Pu：16.1 Bq	17.50±0.89
²⁴¹Am	<α>5485 keV, 84.8% <α>5443 keV, 13.1% <γ>59.54 keV, 35.78% <γ>26.34 keV, 2.40%	20	3.72×10²	25.4±1.3

Table 4. Influence on crosstalk of covering aluminum foil or paper

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Table 4. Influence on crosstalk of covering aluminum foil or paper

平面源 Planar source	不同铝箔厚度下的β/α₀值 / % β/α₀ value at different aluminum foil thicknesses				不同纸片厚度下的β/α₀值 / % β/α₀ value at different paper thicknesses
平面源 Planar source	0	0.016 7 mm	0.033 4 mm	0.050 1 mm	0.106 mm	0.212 mm
²³⁹Pu	7.92	8.41	0.58	0.50	0.68	0.50
²⁴¹Am-²³⁹Pu	21.2	9.67	2.05	1.75	2.66	2.07
²⁴¹Am	34.1	10.9	3.88	3.43	5.03	3.89
²⁰⁹Po	3.92	10.7	0.60	0.34	0.53	0.44

Table 5. Measurements of ²¹⁰Pb in spiked water samples covering without and with aluminum foil

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Table 5. Measurements of ²¹⁰Pb in spiked water samples covering without and with aluminum foil

²¹⁰Pb加标量 / Bq ²¹⁰Pb added value		2.079	2.079	2.079	2.079
²⁰⁹Po / Bq		0.0	2.083	4.166	8.333
覆盖铝箔（0 mm） Cover with Al foil (0 mm)	β净计数率/(count·min^-1) β Net count rate	51.010	52.334	58.113	63.600
	α净计数率/(count·min^-1)α Net count rate	35.993	72.391	103.502	184.457
	²¹⁰Pb测量值/Bq ²¹⁰Pb report value	2.18	2.24	2.49	2.72
	与理论值相对偏差/% Relative deviation	4.9	7.7	19.8	30.8
覆盖铝箔（0.033 4 mm） Cover with Al foil (0.033 4 mm)	β净计数率/(count·min^-1)β Net count rate	36.564	37.622	41.934	44.434
	α净计数率/(count·min^-1)α Net count rate	0.047	0	0.015	0.015
	²¹⁰Pb测量值/Bq ²¹⁰Pb report value	1.92	1.98	2.21	2.34
	与理论值相对偏差/% Relative deviation	-7.6	-4.8	6.3	12.6
覆盖铝箔（0.050 1 mm） Cover with Al foil (0.050 1 mm)	β净计数率/(count·min^-1)β Net count rate	36.481	37.284	41.234	42.921
	α净计数率/(count·min^-1)α Net count rate	0	0	0.019	0.015
	²¹⁰Pb测量值/ Bq ²¹⁰Pb report value	1.95	1.99	2.21	2.30
	与理论值相对偏差/% Relative deviation	-6.2	-4.3	6.3	10.6

Table 6. Measurements of ²¹⁰Pb in spiked water samples without and with crosstalk corrections

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Table 6. Measurements of ²¹⁰Pb in spiked water samples without and with crosstalk corrections

²¹⁰Pb加标量/Bq²¹⁰Pb added value		2.079	2.079	2.079	2.079
干扰项 interference	²⁰⁹Po / Bq	0.0	2.083	4.166	8.333
干扰项 interference	α净计数率 / min^-1 α Net count rate	35.993	72.391	103.502	184.457
串道修正前 Crosstalk uncorrected	β净计数率 / min^-1 β Net count rate	51.010	52.334	58.113	63.600
	²¹⁰Pb测量值 / Bq²¹⁰Pb report value	2.18	2.24	2.49	2.72
	与理论值相对偏差 / % Relative deviation	4.9	7.7	19.8	30.8
串道修正后 Crosstalk corrected	β净计数率 / min^-1 β Net count rate	49.654	49.607	54.214	56.652
	²¹⁰Pb测量值 / Bq²¹⁰Pb report value	2.12	2.12	2.32	2.42
	与理论值相对偏差 / % Relative deviation	2.2	2.1	11.6	16.6

Table 7. Measurements of ²¹⁰Pb in oyster samples covering without and with coverings

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Table 7. Measurements of ²¹⁰Pb in oyster samples covering without and with coverings

牡蛎样品 Oyster samples	自沉积法 Self deposition method			离子交换法 Ion exchange method	两种方法的相对偏差 Relative deviation of two methods
牡蛎样品 Oyster samples	无覆盖/(Bq·kg^-1) No covering ²¹⁰Pb	覆盖物 Covering	覆盖/(Bq·kg^-1) With covering ²¹⁰Pb	²¹⁰Pb / (Bq·kg^-1)	无覆盖 / % No covering	覆盖 / % With covering
JY1	0.67±0.18	铝箔 (0.033 4 mm) Al foil (0.033 4 mm)	0.24±0.15	0.17±0.03	59.5	17.1
JY2	3.12±0.45		2.94±0.36	2.73±0.55	6.7	3.7
ZJ1	0.50±0.12		0.50±0.12	0.47±0.09	3.1	3.1
ZJ2	1.17±0.22		0.33±0.23	0.38±0.08	51.0	-7.0
MM1	0.38±0.15		0.42±0.15	0.75±0.15	-32.7	-28.2
MM2	1.56±0.28		0.84±0.31	0.56±0.11	47.2	20.0
YJ1	0.29±0.13		0.37±0.13	0.39±0.08	-14.7	-2.6
YJ2	0.39±0.13		0.28±0.18	0.48±0.09	-10.3	-26.3
SW1	1.15±0.31	0.212 mm纸片0.212 mm paper	0.64±0.30	0.59±0.12	32.2	4.1
SW2	0.33±0.15	0.212 mm纸片0.212 mm paper	0.31±0.20	0.45±0.09	-15.4	-18.4

Table 8. Measurement results of ²¹⁰Pb in oyster samples without and with crosstalk corrections

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Table 8. Measurement results of ²¹⁰Pb in oyster samples without and with crosstalk corrections

样品Samples	自沉积法Self deposition method		离子交换法 / (Bq·kg^-1) Ion exchange method²¹⁰Pb	两种方法的相对偏差 Relative deviation of two methods
样品Samples	修正前 / (Bq·kg^-1) Crosstalk uncorrected ²¹⁰Pb	修正后 / (Bq·kg^-1) Crosstalk corrected ²¹⁰Pb	离子交换法 / (Bq·kg^-1) Ion exchange method²¹⁰Pb	修正前 / % Crosstalk uncorrected	修正后 / % Crosstalk corrected
揭阳牡蛎Oysters in Jieyang	3.12	2.96	2.73	6.7	4.0
茂名牡蛎Oysters in Maoming	1.56	0.31	0.56	47.2	-28.7
阳江牡蛎Oysters in Yangjiang	0.39	0.26	0.48	-10.3	-29.7

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Meili LI, Lianjing QIN, Lan JIANG, Xiaomin GUO, Guiyuan LIANG. Crosstalk interference and correction methods for low background gas-flow proportional counter[J]. Journal of Radiation Research and Radiation Processing, 2024, 42(2): 020701

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Paper Information

Category: Research Articles

Received: Oct. 17, 2023

Accepted: Jan. 16, 2024

Published Online: May. 28, 2024

The Author Email: QIN Lianjing (覃连敬)

DOI:10.11889/j.1000-3436.2023-0090

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. β -to-α crosstalk ratio for metal planar β sources

Table 1. β -to-α crosstalk ratio for metal planar β sources

Table 2. β -to-α crosstalk ratio for β powder sources

Table 2. β -to-α crosstalk ratio for β powder sources

Table 3. α-to-β crosstalk ratio for α planar standard sources

Table 3. α-to-β crosstalk ratio for α planar standard sources

Table 4. Influence on crosstalk of covering aluminum foil or paper

Table 4. Influence on crosstalk of covering aluminum foil or paper

Table 5. Measurements of 210Pb in spiked water samples covering without and with aluminum foil

Table 5. Measurements of 210Pb in spiked water samples covering without and with aluminum foil

Table 6. Measurements of 210Pb in spiked water samples without and with crosstalk corrections

Table 6. Measurements of 210Pb in spiked water samples without and with crosstalk corrections

Table 7. Measurements of 210Pb in oyster samples covering without and with coverings

Table 7. Measurements of 210Pb in oyster samples covering without and with coverings

Table 8. Measurement results of 210Pb in oyster samples without and with crosstalk corrections

Table 8. Measurement results of 210Pb in oyster samples without and with crosstalk corrections

Table 5. Measurements of ²¹⁰Pb in spiked water samples covering without and with aluminum foil

Table 5. Measurements of ²¹⁰Pb in spiked water samples covering without and with aluminum foil

Table 6. Measurements of ²¹⁰Pb in spiked water samples without and with crosstalk corrections

Table 6. Measurements of ²¹⁰Pb in spiked water samples without and with crosstalk corrections

Table 7. Measurements of ²¹⁰Pb in oyster samples covering without and with coverings

Table 7. Measurements of ²¹⁰Pb in oyster samples covering without and with coverings

Table 8. Measurement results of ²¹⁰Pb in oyster samples without and with crosstalk corrections

Table 8. Measurement results of ²¹⁰Pb in oyster samples without and with crosstalk corrections