[3] Dezhong DAN. Microwave digestion technique in pretreatinent of environmental and biological materials. Sichuan Environment, 13, 32-35(1994).

[4] Run YE, Fangzhu LIU, Jian LIU et al. Determination of contents of Cu, Mn, Fe, Zn, Ca, Mg, K and Na in rice using microwave digestion and inductively coupled plasma-optical emission spectrometry. Food Science, 35, 117-120(2014).

[5] Qiong CHENG. Development of a large-capacity rapid ashing apparatus for biological samples. Mianyang of Sichuan Prov(2011).

[6] Qiong CHENG, Lan DONG, Yang DU et al. Comparison on microwave ashing method and electric stove-muffle furnace method for kilogram level biological samples. Journal of Nuclear and Radiochemistry, 36, 64-67(2014).

[7] Yiyao CAO, Shunfei YU, Zhiqiang XUAN et al. Study on rapid microwave-ashing pretreatment method for radioactivity monitoring in food. Chinese Journal of Radiological Medicine and Protection, 38, 43-47(2018).

[13] Zhiqiang PAN. Environmental monitoring and evaluation of ionizing radiation(2007).

[14] Xuefu XIAO, Qingyu YUE. Environmental radiation monitoring technology(2015).