[Gate-users] defining cylindrical PET with different crystal

[lupa euy]

dear gate users, 

I want to define a cylindrical PET with 3 different crystal, axial wise. 
Let say, the axial length is 90 cm, 
first 30 cm is different crystal, 
2nd 30 cm is different crystal
3rd 30 cm is different crystal. 

I have tried to defined 3 different modules, but when I try to attached the module1, module2, module3 (the name of my modules), 
it says that (for module3 and module2), the module 1 is already attached.. 

At the end, I also want to attached a different dead-time for each cyrstal type.. 

is that possible to do this? 

please help.. 

best regards
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