$^{10}$B has advantages over $^{6}$Li in that it has a larger cross section and a shorter range for converted charged particles in the CCD; $^{10}$B emits only short range particles. The ranges of α (1.47 MeV), α (1.78 MeV) and $^{7}$Li(0.84 MeV, 1.01 MeV) in Si are 5, 6 and 2 µ m, respectively. In contrast, $^{6}$Li emits α particles and tritons with ranges of 7 and 40 µ m. Long range tritons degrade the spatial resolution, as discussed in Ref. [4]. A CCD is an ideal device for UCN detection because of its high spatial resolution and its ability to capture data in real time. Since a CCD cannot directly detect neutral particles, a neutron converter to create charged parti- cles must be attached to the front of the device. A back-thinned type CCD is chosen to avoid a large insensitive volume in front of the active volume of the CCD, which would prevent converted charged particles entering the active volume or degrade the spatial resolution. We use a commercial CCD detec- tor, HAMAMATSU S7170-0909, in the low dark current read out mode. The specifications are shown in Table 1. Generally, CCD might have white-spot pixels induced by radiation damage. Only 2 pixels have become noisy after $^{60 million neutron irradiation per 512}$×512 pixels during the neutron beam tests mentioned below. The neutron converter is attached directly to the surface of a CCD to minimize the distance between the positions of an incident neutron and a detected charged particle [4]. The converter layer is mounted on the CCD 2.2. CCD sensor 2.3. Fabrication of a converter layer 3