Particles lost in MCNP running

[flashcflash]

Hi dears,
My model has several air bubbles to surrounding solid models. The output file reported some particles were lost in my air bubbles and could not find a cell there. I have used vised to check and found that cell 1500-1504,cell2-7,cell1300 has some problems. I changed the geometry definitions from planes to macro rectangles, but the errors persist. Any advice would be helpful. Thank you!

Attachment is output file with source code.

 

[Alex A]

Cell 1300 is the big cell containing the experiment and air, outside that is the void cell. That cell definition is failing and anything going into the space that should be cell 1300 is getting lost. When defining a space in a box you want the space between x1 and x2, y1 and y2, z1 and z2 so the definition reads like +x1 -x2 +y1 -y2 +z1 -z2
When defining the outside of that space you can't just flip the tests, you have to use the union operator :
People that have done Boolean logic might recognize this as De Morgan's theorem in action. -x1 +x2 would straight away be a space that doesn't exist, it's below a lower value and at the same time above a higher value.

What is needed is -x1:+x2:-y1:+y2:-z1:+z2
ie, all the space below the lower bounds and also all the space above the higher bound for every axis.

 

[flashcflash]

Cell 1300 is the big cell containing the experiment and air, outside that is the void cell. That cell definition is failing and anything going into the space that should be cell 1300 is getting lost. When defining a space in a box you want the space between x1 and x2, y1 and y2, z1 and z2 so the definition reads like +x1 -x2 +y1 -y2 +z1 -z2
When defining the outside of that space you can't just flip the tests, you have to use the union operator :
People that have done Boolean logic might recognize this as De Morgan's theorem in action. -x1 +x2 would straight away be a space that doesn't exist, it's below a lower value and at the same time above a higher value.

What is needed is -x1:+x2:-y1:+y2:-z1:+z2
ie, all the space below the lower bounds and also all the space above the higher bound for every axis.

Thank you, that must be the mislead of user's manual. It said I should seldom using complement operator. Not only the last cell, several of them have problem. The vised would report error in red lines even using union operator, the complement operator for cell combination is the only way to pass the geometric test.