There are two general requirements for routine monitoring:
Next shot: Now let us have a look on the yellow table: Any line of this table represents a monitoring procedure being characterized as follows
For example: If you would apply lung measurements with a monitoring interval of 180 d, you should be able to detect 0.8 Bq Am-241 in the lungs. The best lung counters, however, reach a LLD of 3 - 5 Bq and so the sensitivity criterion S is not fulfilled.
Next shot: When scrolling down the table, you will see at the end four green lines with monitoring procedures fulfilling both the sensitivity criterion S and the misinterpretation criterion M, Thus, routine measurement of fecal excretion with monitoring intervals of 60 d or more would be optimum for routine incorporation monitoring. It is supposed that Dr. Taylor would prefer the 180 d monitoring interval and so this interval should be selected.