A scintillator for converting radiation into light includes a first conversion layer being a planar phosphor and a second conversion layer having columnar phosphors. After conditioning the preparation is exposed for a contraction-effective dose of a known contraction-effective substance to make it assume a first tensioned state. This non-aqueous electrolyte solution improves stability of a SEI film formed on a surface of an anode of a lithium secondary battery and thus improves normal temperature cycle performance and high temperature cycle performance. During the process, solid particles are produced having a specific definable and controllable size and weight. The cradle portion, wrap portion and strap are formed of soft material without any fasteners required so as not to damage the instrument.