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Documentation of the Crime Scene: Step by Step

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What is documentation of the crime scene and Why it is done? After securing the crime scene, the next most important step is documentation of the crime scene because documentation permanently records the crime scene and its physical evidence. Documentation should be done without any wastage of time as the scene and its evidence may get altered over time. The documentation should be done innovatively and the originality of the crime scene should be maintained and documentation should not have pauses or breaks, it should remain constant till the whole crime scene is documented. There are four main tasks of documentation that is note-making, photography, videography , and sketching . It should be noted that all four tasks are necessary and none is a substitute for another. For example, notes are not substitutes for photography, video is not a substitute for sketching, etc. Following are the sequence for crime scene documentation: 1. Note making Documentation of crime scene in the f...
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Atomic Absorption Spectroscopy: Instrumentation, Working and Applications

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What is Atomic Absorption Spectroscopy? Atomic absorption spectroscopy provides us the data about the absorbance of electromagnetic radiation by specific elements. This technique is widely used to determine the presence of unknown elements like alkali and alkali earth metals in the sample.  This is supported by the fact that different metals will absorb different wavelengths of radiation and transmitted radiation is detected by using Lambert Beer's law the graph between the absorbance and the wavelength of the radiation is plotted. Instrumentation of Atomic Absorption Spectroscopy 1. Radiation source The most common radiation source in Atomic Absorption Spectroscopy is a hollow cathode lamp (HCL). It contains a tungsten anode and a cylindrical hollow cathode made of the element of desire which is the element that is to be determined in the sample.  These anode and cathode are sealed into a glass tube filled with an inert gas like neon or argon . When a voltage is appl...
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ISO: Introduction, History and ISO 9000

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What is ISO? ISO, short for the International Organization for Standardization, is an independent and non-governmental international organization that consists of 167 national standards bodies. Its purpose is to develop and publish standards that promote global consistency and quality in various industries and sectors.  Its primary role is to develop and publish a wide range of proprietary, industrial, and commercial standards. Currently, ISO has over 24,000 active technical standards that encompass diverse areas, including manufactured products, technology, food safety, agriculture, and healthcare. History of ISO The International Organization for Standardization (ISO) was founded in 1947 and is currently based in Geneva, Switzerland. Its roots can be traced back to 1920 when it originated as the International Federation of the National Standardizing Associations (ISA).  However, its operations were suspended during World War 2. After the war, United Nations Standards Coo...
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