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采用衰变法对工作场所α放射性气溶胶活度浓度进行监测,分析研究了热试验完成后CRARL各热室内所取气溶胶的α放射性强度。经过测量计算得出,仪器本底计数率为3.05×10~(-3)s~(-1),净计数率不确定度σ(0)=2.25×10~(-3),推算出判断阈L C=2.33×10~(-3)Bq/m~3,探测限L D=4.66×10~(-3)Bq/m~3。分析结果表明,试验完成后CRARL所使用的热室中,01B内放射性粉尘浓度相对较高,α放射性气溶胶活度浓度最高,平均为34.5Bq/m~3,其次为03B,平均活度浓度为1.95×10~(-2)Bq/m~3,
The decay method was used to monitor the α-radioactive aerosol activity concentration in the workplace. The α-radioactivity of aerosol in each hot chamber of CRARL after thermal test was analyzed. After calculation, the background counting rate is 3.05 × 10 ~ (-3) s ~ (-1) and the net count rate uncertainty σ (0) is 2.25 × 10 ~ (-3) The threshold LC = 2.33 × 10 -3 Bq / m ~ 3, the detection limit of LD = 4.66 × 10 -3 Bq / m ~ 3. The results show that the concentration of radioactive dust in 01B is relatively high in the hot chamber used in CRARL after the completion of the experiment, α radioactive aerosol activity concentration is the highest, the average is 34.5Bq / m ~ 3, followed by 03B, the average activity concentration Is 1.95 × 10 ~ (-2) Bq / m ~ 3,