[ccp4bb]: How to determine the decay of intensity of a crystal during data collecting?

[JXQI]

This is not a question directly related to ccp4 as far as I can tell, but I'm hoping someone on this list may have some insight.   We are now trying a new crystal mounting method, I want to know weather there is any decay of intensities in the process of data collection.I use the R-AXIS IV++ imaging-plate detector and the CrystalClear to process  the data. If any person has a reference, I would be grateful.   Thank you in advance for your help!   Janxon