Section 10 Appendices
Helios Gene Gun System | 49
3. To determine the depth of penetration, align the 0 of an eyepiece micrometer at the upper surface of
the agar and measure the distance to the arbitrary floor of the microcarrier distribution. This value is the
microcarrier depth.
The distribution pattern of the microcarriers is bell-curve shaped with respect to depth and area. The
highest microcarrier density is concentrated at the center of the shot and at the surface of the target site.
For this reason, in order to obtain a truly representative microcarrier distribution cross section, be careful to
examine the center and full length of your target site.
Fig. 26. Representative cross-section showing penetration of gold particles into water agar after discharge with a helium pulse.
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