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WebAt a particular instant, the activity of a sample of thorium-232 is 120 Bq. 6 (b) (I) Add To Classified 1 Mark . Calculate the time taken for the activity of this sample to fall to 15 Bq. ... The sample of thorium-232 is used in an experiment in a laboratory. Explain why its activity may be regarded as constant. answer . Q1 WebBq/cc (air) 2 x 10-8. uCi/cc (water) 7.4 x 10-4. Bq/cc (water) GENERAL RADIOLOGICAL SAFETY INFORMATION • Often used in a “sealed source” (i.e., encapsulated sources). If the source is designed ... Laboratory coat and gloves must be … Web0.457 ± 0.015 Bq L-1. However, these values are below 1 Bq L-1, the guidance level recommended. For gross alpha the activities range from values lower than 0.015 Bq L-1 (minimum detectable activity) to 0.330 ± 0.026 Bq L-1. In general, the alpha activity are lower than recommended level (0.1 Bq L-1) with is as400 still used