Biological Damage due to Ionizing Radiation Ionizing radiation may produce DNA Ionizing radiation is a well-known risk factor for developing benign and malignant diseases including different types of cancer. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3d5abb-NzZjM This is because more cells have been impacted and there is a greater Biological Effectsand Risks of Ionizing Radiation 2. 0000057580 00000 n Sunburn and tanning are the best known acute effects of excessive UV radiation exposure; in the long term, UV radiation-induced degenerative changes in cells, fibrous tissue and blood vessels lead to premature skin ageing. However, safe handling of all levels of radiation is important to prevent or minimize possible biological effects. 7 Radiobiology The study of the action of ionizing radiations on living things. �ar*kЬh�Pp��"�w$��5��+XL�J�;f%G�u�B���3Oh\˳�>5ǠO�e���aK �TYmq[�^'�J�N�j�d�ێ"F�[����s&�@�3y�Y�Ŗa֒�~��>�H�ۻ�Q�K��R1����. Biological Effects of Radiation Hall, Radiobiology for the Radiologist Cember, Ch. 0000023001 00000 n PDF | Infrared (IR) radiation is electromagnetic radiation with wavelengths between 760 nm and 100,000 nm. The most common unit used to measure the effects of radiation on biological tissue is the rad (radiation absorbed dose); the SI equivalent is the gray (Gy). We tend to think of the effects of radiation in terms of how it impacts living cells. Human studies also provide evidence for a declining risk with increasing age at exposure, although the magnitude of this reduction above age 30 years is uncertain (NCRP, 2000; Biological Effects of Ionizing Radiation (BEIR), 2006). 20LI)�'@Z��a�+�f�� r(�A %���Y�� � ��%` J. M. Williams Biological Thermal and Nonthermal Mechanisms v. 4.7 2 Abstract For over sixty years, it has been reported that microwave electromagnetic radiation (EMR) had effects on humans which could not be explained by detectible heating of tissue. As was written, each type of radiation interacts with matter in a different way. Effects on the skin include erythema (reddening lik e sunburn), dry desquamation (peeling), and moist desquamation (blistering). In low levels, these effects are either very, very small compared to natural incidences or non-existent depending on the biological model used for estimating the potential risk. Acute radiation at moderate doses results in a negligible adverse effect on subsequent generation. 3. H�b```f``�a`��@��(���q���b�o�u�����g>~b``db�dPl�N����Ɋ��1�A�!KA�A�����i&�™ FtX�����x,��%>�s� 0000049877 00000 n 0000001797 00000 n The body is able to repair damage from radiation, chemicals and other hazards. Waves/second is designated Hz, after Hertz, the discoverer of radio waves. Ionizing radiation in very high levels is known to increase the incidence of cancer, birth anomalies, erythema, and other problems. 312 0 obj <>stream Know the additional cancer risk incurred from exposure to 25 rem.2. 9�7�-{��"�(�|,b[FG�`G��c"38�F ���8��ځ�"�Hrh�Ǚ��*HK�8��.142.ab8�������|����I�-@�k��L�@z)��l� y����sn9܂Ɯs�s�i@�t��D�eJ��E3��S��k�W��/����e�3I'F8��8�i�TT��|�T�@� u> endobj 130 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 131 0 R /TT4 147 0 R >> /ExtGState << /GS1 152 0 R >> /ColorSpace << /Cs6 132 0 R >> >> endobj 131 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 117 /Widths [ 250 0 0 0 0 0 0 0 0 0 0 0 0 333 0 0 500 500 500 500 500 500 500 500 500 500 0 0 0 0 0 0 0 0 667 722 722 667 0 0 0 0 0 0 0 944 722 0 0 0 722 556 667 722 0 0 0 0 0 0 0 0 0 0 0 500 0 444 556 444 333 500 556 278 0 0 278 0 556 500 556 0 444 389 333 556 ] /Encoding /WinAnsiEncoding /BaseFont /ADDDDC+TimesNewRoman,Bold /FontDescriptor 133 0 R >> endobj 132 0 obj [ /ICCBased 154 0 R ] endobj 133 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 656 /Descent -216 /Flags 34 /FontBBox [ -558 -307 2034 1026 ] /FontName /ADDDDC+TimesNewRoman,Bold /ItalicAngle 0 /StemV 133 /FontFile2 153 0 R >> endobj 134 0 obj 11017 endobj 135 0 obj << /Filter /FlateDecode /Length 134 0 R >> stream Absorbed doses from nuclear medicine procedures are very low. )����n�ە�,�ԝMp���f0O���\����g�P{��|�5��gIe� ��PRH��%��ǀ^w �=��C����ZF��^ A book entitled Biological Effects of Ionizing Radiation Exposure Countermeasures Current Status Future Perspectives written by Anonim, published by Unknown which was released on 01 January 1970. 0000050457 00000 n radiation for lung cancer in females (National Council on Radiation Protection and Measurements (NCRP), 2000). DNA molecules are the most critical cellular structures that can be affected by ionizing radiation. 284 0 obj <> endobj 0000001542 00000 n The radiation may damage the cell, but the cell repairs the damage; 3. Biological effects of radiation 1. Radiation Protection J. U. Burnham Chapter3: Biological Effects page 3-1 3 • BIOLOGICAL EFFECTS OF IONIZING RADIATION INTRODUCTION This chapter deals with the effects ofionizing radiation on the body. The current established standards of exposure to EMFs in Poland and in the rest of the world are based on the thermal effect. endstream endobj startxref For example charged particles with high energies can directly ionize atoms. a variety of ways, such as by chemical, biological and physical agents or by ionising radiation. Beta particles(electrons) are … Subcommittee on Permanent and Delayed Biological Effects of Ionizing Radiations From External Sources Henry A. Blair, Department of Radiation Biology, Chairman George W. Casarett, Department of Radiation Biology xi Biological Effects of Radiation. Area Exposed The portion of the body irradiated is an important exposure parameter because the larger the area exposed, other factors being equal, the greater the overall damage to the organism. If any, are submerged in the background and can’t be demonstrated. The interaction of ionizing radiation with the human body, arising either from external sources outside the body or from internal contamination of the body by radioactive substances, leads to biological effects which may later show up as clinical symptoms. BIOLOGICAL EFFECTS OF IONIZING RADIATION. As was written, each type of radiation interacts with matter in a different way. However alpha particles will deposit their energy over a smaller volume (possibly only a few cells if they enter a body) and cause more damage to those few cells. RSSC BIOLOGICAL EFFECTS OF IONIZING RADIATION 08/11 5-5 B. The effects of the damage from ionising radiation can be short-term or long-term depending on the means and severity of the exposure. Alpha particlesare fairly massive and carry a double positive charge, so they tend to travel only a short distance and do not penetrate very far into tissue if at all. 0000042454 00000 n The cause of biological effects by exposure to radiation too weak to cause heating are poorly understood at present. Similarly, radiation exposure to the testes can result in temporary or permanent azoospermia. 0000090544 00000 n The radiation may pass through without any damage occurring; 2. h�b```�*>#^�e`��0p,`d��q�� � ��E���6��B �� �, Y���r �6�x�_V 8�} kHz is kilohertz (1000 Hz), MHz is megahertz (1,000,000 Hz), and GHz is Fear of radiation must not be permitted to undermine the great value of radiation in clinical practice. %PDF-1.4 %���� Its effects are more pronounced in cells that reproduce rapidly, such as the stomach lining, hair follicles, bone marrow, and embryos. H�lW�n��߯襼P�,_[� ���fd!h$G�,���~�ԣ�� ��#��z�:U�t�|�^i�����ӞƖ�?��i��v�������m{|� i{|�|���y��~��)���x��������������?����>���������������o���C����{���>�>�������__^�ߞ�����ۗ�?����y/w?_��\�|��zQ�i/c�Ѷ��������,7��Y~4�����s��=���q�Kɜ�����y�>=��MM��xxy{y��}~z������(u��n�g�#�\X�RKe1��>�m�fC�^����Ӏi��!��y{LX��{��^�$qp8�L{6���xj�%�[�sg[�{o��N��l�q��.� 7��y/�_q*�,��.��F�e�>u����b������W%��3�n���5Uc1b��.���f�I�=��4L�HB��G�Ԕ#̓�:��fX�g�0�y���g�y���-��\w���8�����)��O9�2�L� �����N(9��v.+��>p� ��د*��aYɞ��y.�,���l(Fp�s���)�0�)�����. 0000002433 00000 n Damage to biological tissues, however, is proportional to the amount of energy absorbed by tissues, not air. For low levels of exposure, the biological effects are so small they may not be detected. Biological effects of the same doses of ionizing radiation can differ greatly. ��r4�l�~�"�:'�I�Σ_:�_@W��c��yo�_$�%J.g� 5.4 Effects of Radiation on Foetus. Alpha particlesare fairly massive and carry a double positive charge, so they tend to travel only a short distance and do not penetrate very far into tissue if at all. 0000002681 00000 n UV radiation can also cause inflammatory … h�bbd``b`: $���@ �� H�d �' � DH�A��� �K�CH��ȸ�b``$���p�@� U@" trailer << /Size 158 /Info 125 0 R /Root 128 0 R /Prev 254861 /ID[<12d087f492ce0ff567410897d4b670c4>] >> startxref 0 %%EOF 128 0 obj << /Type /Catalog /Pages 122 0 R /Metadata 126 0 R /PageLabels 120 0 R >> endobj 156 0 obj << /S 402 /T 490 /L 561 /Filter /FlateDecode /Length 157 0 R >> stream 0000057603 00000 n 0000023024 00000 n 0000013801 00000 n 0000030205 00000 n Four things can happen when radiation enters a cell: 1. 0000042477 00000 n 0000067253 00000 n Objectives I WILL :1. The short-term thermal effects of RF radiation on humans are well documented, but less is known about the long-term health effects. 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