International journal of legal medicine
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Comparative Study
Doppler radar velocity measurements for wound ballistics experiments.
Bullet velocity is a basic parameter in wound ballistics studies. It is usually measured electronically by means of a variety of solid or photoelectric barriers connected to equipment measuring the time elapsing between impulses, enabling the velocity to be calculated. With the advent of Doppler radar velocity measurement of large calibre artillery shells, the use of this equipment for wound ballistics experiments was investigated. ⋯ A very good correspondence between the measured entry and exit velocities in low and medium velocity bullets was found, i.e. an average deviation of less than 1% (range 0-2%) between the two types of equipment. In high velocity bullets measurement of entry velocities was just as good, but in both methods measurement of the exit velocity was complicated by the cluttering of signals by fragments of tissue released from the exit wound and the deflection of the bullet, Doppler radar offers important benefits - simple set up, minimal risk of damage of equipment by stray bullets and very good accuracy - and may replace photocells and similar equipment in studies involving low and medium velocity bullets. Measurement of the exit velocity of high velocity bullets is unsatisfactory in both methods, and it is necessary to improve the Doppler radar method in order to measure that as well.
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Case report on a suicide with a gas pistol loaded with 8 mm blank cartridges. A 58-year-old male shot himself in the right temple and then in the back of the neck. ⋯ The soft tissues were injured solely by the pressure of the exploding powder. Death was due to an air/gas embolism in the right ventricle of the heart.
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The case of a suicide attempt of a depressed male using a circular saw is reported and discussed. There was a hesitation injury that is seldom described in this type of power tool suicide. A deviation in the position of the superior sagittal sinus allowed the life of the victim to be saved by a neurosurgical operation.
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The autopsy reports of 233 babies and children aged between 5 days and 7 years, including 190 cases of non-traumatic and 43 cases of traumatic death, were reviewed. In 94 out of 190 cases of death due to natural causes, attempted resuscitation (closed-chest massage) was performed and only in 2 cases could fractures of the ribs localized on both sides in the midclavicular line be observed. In 15 of the 43 cases of death due to traumatic events, fractures mainly of the posterior ends of the ribs occurred. ⋯ Fractures localized in particular in dorsal parts of the chest wall of infants without metabolic bone diseases, however, must be interpreted as a strong indication of physical child abuse. It was observed that relevant injuries due to resuscitation are caused much more frequently or almost exclusively by physicians than by non-medical persons. This finding refutes any possible claims that rib fractures were caused by inexpert resuscitation in a panic-like reaction.
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The yaw angle in flight of high velocity bullets has been discussed for a number of years, due to its contribution to the tumbling of the bullet in the target. Since few unclassified reports of contemporary bullets are available, we investigated the yaw angles of the bullets used in the M16A2, G3, AK-47 and AK-74 rifles by the shadowgraph technique. ⋯ Bullets from some modern small calibre high velocity rifles such as the M16A2 and the AK-74 can have quite large yaw angles in their initial flight. The results, which confirm the opinion of contemporary writers, should settle the controversy in this area of wound ballistics.