Calculation of decay tank capacity and minimum storage time for the wastewater of nuclear medicine department based on the total emission control

Table 1. The corresponding k value for different hospitalization periods and different days to reach full coverage in the decay tank
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Table 1. The corresponding k value for different hospitalization periods and different days to reach full coverage in the decay tank
住院周期
Hospitalization period / d
存满天数
Different days to reach full coverage / d
k值
k value
1 n 6.63
2 2n 3.55
2 2n+1 3.81
3 3n 3.16
3 3n+1 3.45
3 3n+2 3.38
4 4n 2.35
4 4n+1 2.71
4 4n+2 2.70
4 4n+3 2.50

Table 2. Measured ¹³¹I activity concentration at the outlet of decay pool and estimated ¹³¹I emission quantity

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Table 2. Measured ¹³¹I activity concentration at the outlet of decay pool and estimated ¹³¹I emission quantity

医院编号Hospital ID	1	2	3	4
甲癌床位数Number of beds for thyroid cancer	20	24	14	10
衰变池总容量Total decay tank capacity / m³	780.2	110.7	80	115
单池容量Individual tank capacity / m³	195.05	36.9	20	37.5
实际收集容量Actual volume of decay tank / m³	195.05	32.4	20	37.5
存满天数Days until decay tank is full / d	37	23	31	44
单张病床单日用水量(W₀) Daily water usage per bed / L	263.6	58.7	46.1	85.2
¹³¹I实测活度浓度Measured activity concentration of ¹³¹I / Bq∙L^-1	4.87×10⁵	9.01×10⁴	1.20×10⁷	4.08×10⁵
衰变池内¹³¹I实测总活度Total measured activity of ¹³¹I in decay tank / 10¹⁰ Bq	9.509	0.296	24.013	1.517
¹³¹I理论总活度Theoretical total activity of ¹³¹I in curies / 10¹¹ Bq	3.474 3	4.169 9	2.430 9	1.739 0
RJ方程组计算出的理论最小暂存时间(T_min) Theoretical minimum temporary storage time (T_min) calculated by RJ equations / d	119.9	126.7	117.9	110.7
实测总活度是否低于RJ方程组计算出的总活度Whether the measured total activity is lower than the total activity calculated by RJ equations	是Yes	是Yes	是Yes	是Yes
暂存T_min后¹³¹I预估排放总量 Estimated total discharge of ¹³¹I when temporary storage time attains T_min / 10⁷ Bq	2.997	0.074	10.841	0.962
是否符合GB 18871―2002要求（小于1.11×10⁸ Bq） Whether is compliance with GB 18871―2002 requirements (less than 1.11×10⁸ Bq)	是Yes	是Yes	是Yes	是Yes

Table 3. Daily water consumption per hospital bed

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Table 3. Daily water consumption per hospital bed

医院编号Hospital ID	1	2	3	4	5	6	7	8
平均值Average value / L	106.45
衰变池容量Individual tank capacity / m³	195.05	32.4	20	37.5	26	33	42.7	35
存满时间Days until decay tank is full / d	37	23	31	44	91	61	83	82
单日单张病床用水量 Daily water consumption per hospital bed / L	263.58	58.70	46.08	85.23	35.71	180.33	128.61	53.35

Table 4. The calculated volume of decay tank using RJ equation group (T= 3n)

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Table 4. The calculated volume of decay tank using RJ equation group (T= 3n)

病人数Number of patients	住院周期Hospitalization period / d	RJ公式计算出的最小暂存时间T_min Minimum temporary storage time (T_min) calculated by RJ equations / d	衰变池容量（RJ方程组）Volume of needed decay tank (using RJ equation group) / m³	衰变池容量（现行方法）Volume of needed decay tank (current method) / m³	RJ方程组较传统方法可节省的衰变池容量The difference of the two methods / %
5	3	104.62	28.68	49.50	42.06
6	3	105.18	34.71	59.40	41.57
7	3	106.97	41.18	69.30	40.58
8	3	108.51	47.74	79.20	39.72
10	3	111.10	61.10	99.00	38.28
15	3	115.79	95.53	148.50	35.67
20	3	119.12	131.03	198.00	33.82

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Qi ZHANG, Yunwen GE. Calculation of decay tank capacity and minimum storage time for the wastewater of nuclear medicine department based on the total emission control[J]. NUCLEAR TECHNIQUES, 2024, 47(4): 040301

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Paper Information

Category: Research Articles

Received: Jan. 1, 2024

Accepted: --

Published Online: May. 28, 2024

The Author Email: ZHANG Qi (张琪)

DOI:10.11889/j.0253-3219.2024.hjs.47.040301

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. The corresponding k value for different hospitalization periods and different days to reach full coverage in the decay tank

Table 1. The corresponding k value for different hospitalization periods and different days to reach full coverage in the decay tank

Table 2. Measured 131I activity concentration at the outlet of decay pool and estimated 131I emission quantity

Table 2. Measured 131I activity concentration at the outlet of decay pool and estimated 131I emission quantity

Table 3. Daily water consumption per hospital bed

Table 3. Daily water consumption per hospital bed

Table 4. The calculated volume of decay tank using RJ equation group (T= 3n)

Table 4. The calculated volume of decay tank using RJ equation group (T= 3n)

Table 2. Measured ¹³¹I activity concentration at the outlet of decay pool and estimated ¹³¹I emission quantity

Table 2. Measured ¹³¹I activity concentration at the outlet of decay pool and estimated ¹³¹I emission quantity