Inventories are defined by pressing the Source Inventory Settings Edit… button in the Source dialog. The following dialog will be displayed:
Inventories can be added and deleted using the Add Inventory and Delete Inventory buttons. (Note, however, that you must have at least one inventory). You can move between existing Inventories using the Previous and Next buttons.
You can assign a Description to each inventory. This is not used by GoldSim and is for documentation purposes only. For each Inventory, the following must be specified:
Species Mass: This is the initial amount of species mass associated with this inventory. It represents the amount of mass in a single package. It must be a vector by species with dimensions of mass. The values must be non-negative and should not vary with time. If an Inventory does vary with time, only the initial values will be used.
Note: If you are simulating
radioactive species (using the RT Module) and your input inventories are in
terms of activity (Ci or Bq), you can easily convert these to mass by dividing
the inventory vector by the specific activity vector:
Inventory / Species.Specific_Activity
Location: This is a list-box with two options: "Outer" and "Inner". It species the location of the Inventory relative to the barriers. “Outer” means within the outer barrier, and “Inner” means within the inner barrier. Note that if you have no barriers, this input is grayed out. Similarly, if you have only a single barrier, only the "Outer" option is available.
Waste Matrix: This is drop-list that determines whether or not the Inventory is bound in a matrix, and if it is, the manner in which the matrix is assumed to degrade. There are four options in the drop-list:
None: The Inventory is not bound within a matrix (the default).
Specified lifetime: The inventory is bound in a matrix, and the matrix degrades with a specified lifetime. The lifetime is specified in the field directly below the drop-list. The lifetime represents the time period over which the matrix is degraded at a uniform rate. The value must be non-negative and have dimensions of time.
Specified degradation rate: The inventory is bound in a matrix, and the matrix degrades with a specified rate. The rate is specified in the field directly below the drop-list. The rate must be a fractional degradation rate. That is, it represents the fraction of the existing mass which degrades per unit time. The value must be non-negative and have dimensions of inverse time.
Congruent dissolution: The inventory is bound in a matrix, and the matrix degrades based on solubility-limited dissolution. GoldSim identifies the largest single species in the inventory, and treats this as the matrix material. Upon barrier failure, the matrix is then degraded at a rate that keeps the matrix species at its solubility limit within all Inventory Cells.
Note that when matrix degradation is specified (i.e., the latter three cases), the following two points always apply:
•Species mass is exposed congruently with the degradation of the matrix.
•Matrix degradation in a package does not start until the barriers for the package have failed.
Learn more about:
Understanding Matrix Lifetimes and Fractional Degradation Rates