C-band low-energy electron linear accelerators are preferable for applications which require compact structure and accurate positioning. During the past two years, the accelerator laboratory of Tsinghua University has developed a C-band 6 MeV standing-wave biperiodic on-axis coupled linear accelerator. The weight of the accelerator is 7.4 kg and the length is about 39 cm, which includes the thermal-cathode gun and the flange for tests. High capture ratio, narrow energy spectrum, and small spot size have been achieved in the high power rf test, which shows good performance of this accelerator and its great potential for industrial and medical applications.

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A method to generate long-lived isomeric states effectively for Mössbauer applications is reported. We demonstrate that this method is better and easier to provide highly sensitive Mössbauer effect of long-lived isomers (>1ms) such as 103 Rh. Excitation of (γ,γ) process by synchrotron radiation is painful due mainly to their limited linewidth.Instead, (γ,γ') process of bremsstrahlung excitation is applied to create these long-lived Rh have been generated from this method.Among them, 103 Rh is the only one that we have obtained the gravitational effect at room temperature.

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