Note that 1/[G.sub.I] has been often called the shield factor in the previous literature [9, 18].
Namely, the value of [z.sub.ori] [approximately equal to] 9 cm gives the minimum interference gain (the maximum shield factor) for all values of [L.sub.C] and [L.sub.D].
First, we can observe that the interference gain (i.e., the shield factor) is seriously affected by the calibration errors.
It can be seen that the shield factor (1/[G.sub.I]) exceeds [10.sup.4] for [r.sub.I] > 15 m when no calibration errors exist but that the shield factor drops to 100 when calibration errors of 0.1% exist, and to 30 when calibration errors of 1% exist.
That is, with 1% calibration errors, the vector sensor array has a shield factor of approximately 500 ([G.sub.I] = 2 x [10.sup.-3]).
(4) The optimal values of the parameters [L.sub.C] and [L.sub.D], the truncation values of the multipole-order 1, can also be determined by evaluating dependences of the signal, noise, and interference gains (shield factor) on these parameters.
The shield factor exceeds [10.sup.4] for interference originating from fairly distant sources ([r.sub.I] > 15 m) when no calibration errors exist.
These include possible verification testing of shielding efficacy in actual radiation-contaminated areas, and initiatives to further improve the seat's user-friendliness and its shield factor
. Joint efforts will be directed into proposing adoption of the new seats by construction companies performing decontamination work, operators involved in the construction or maintenance of contaminated waste incineration facilities, power providers, etc.