半衰期是用于较合理的来衡量文献老化的一个重要的参考标准,在对于半衰期的研究中,一定程度上能够有助于揭示各类学科发展的一种时效特性。本文侧重于研究期刊的引用半衰期,以我国精神病学与神经病学学科核心期刊为分析对象,在CMSCI数据库获取该学科2008-2012年核心发文与引文的相关数据,并利用现有的半衰期公式来计算精神病学与神经病学各核心期刊的引用半衰期值。此次的研究发现精神病学与神经病学各期刊每一年的引用半衰期范围大致在2.5~6年间内;精神病学与神经病学核心期刊的引文语种多为外文,借鉴参考国外医学科技文献之处较多;精神病学与神经病学各期刊的文献老化速度与其性质特点关系密切;该学科核心期刊五年间的平均引用半衰期大多为4~5年,从时间角度来看半衰期呈现缓慢增长的趋势。 Half-life is an important reference for more reasonable measurement of the aging of documents. In the study of half-life, it can help to some extent reveal a kind of aging characteristics of the development of various disciplines. This article focuses on the reference half-life of the research journals. Taking the core periodicals of psychiatry and neurology in our country as the analysis object, the relevant data of the core papers and citations of the subject from 2008 to 2012 in the CMSCI database are obtained and calculated using the existing half-life formula Reference half-life values ​​for each core journal of psychiatry and neurology. The study found that the quoted half-life range of each journal of psychiatry and neurology was roughly 2.5 to 6 years. Most citations of the core periodicals of psychiatry and neurology were foreign languages. Reference was made to the references of foreign medical science and technology literature The aging rates of the literature of each periodical of psychiatry and neurology are closely related to the nature and characteristics of the periodicals. The average half-life of citations of the core journals in five years is mostly 4-5 years, and the half-life shows a slow-growing trend from the time point of view.