Which of the Following Tissues Has the Highest Radiation Sensitivity

94 No assumption need then be made about the. The reasons for their sensitivity are not clear.

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In 2007 the International Commission on Radiological Protection ICRP published a new set of tissue weighting factors 2 as below.

. Must be used on all patients for all exposures. Despite this difference the same protection standards are currently applied to both men and women as per ICRP recommendations. Alpha particles Alpha particles have approximately four times the mass of a proton or neutron and approximately 8000 times the mass of a beta particle Figure 54.

The transcription factor p53 mediates the response to radiation. Are all tissues and organs equally sensitive to radiation. Radiation doseresponse relationships for normal tissues have a threshold at low doses which produce no reaction and saturate at high doses FIG.

Stomach colon lung bone marrow red breast remainder tissues. Because of the large mass of the alpha particle it has the highest ionizing power and the greatest ability to damage tissue. Very sensitive cells are also oocytes and lymphocytes although they are resting cells and do not meet the criteria described above.

Which of the following is most susceptible to ionizing radiation. And we should be aware of the harmful effects radiation can have on these before proceeding with the treatment. Radiation has been found to induce cancer in most body tissues and organs.

Gastrointestinal mucosa lining loss. The horizontal axis indicates the absorbed doses to organs through a single high-dose exposure at the time of the atomic bombing while. The guidelines for proscribing dental radiographs used by the American Dental Association and the FDA recommended which of the following dental imaging procedures for a pregnant patient.

The major challenge in radiation therapy is to eradicate the cancer without unduly damaging surrounding normal tissues. Cells that are actively dividing A patient was admitted to the hospital suffering from the following symptoms for the past week. Central nervous system tissue damage.

Which of the following organs are not more sensitive to x-rays and therefore nor considered critical organs. This means that small changes in dose result in relatively large differences in toxicity 30. Which x-ray has the highest bone marrow dose.

Which of the following tissues has highest radiation sensitivity. Tissues and Organs Highly Sensitive to Radiation. What is the Use Factor.

Different tissues and organs however show varying degrees of sensitivity. The tissue which is most sensitive to radiation is lymphoid. Cancer is made up of rapidly dividing cells so the cancer cells are expected to be more sensitive to radiation than normal tissue.

The stomach UGI tract are the highest with a 100 mrad mean dose. A lead apron and a thyroid collar. Which of the following tissues has the highest radiation sensitivity.

In order of how sensitive they are highest. The tissues and organs showing high sensitivity include bone marrow leukemia breasts thyroid glands and lungs. There is evidence that normal tissue radiation doseresponse relationships are steep.

This figure shows how cancer risks have increased depending on where in the body was exposed to how much doses of radiation targeting atomic bomb survivors. Skin and other organs with epithelial cell lining cornea oral cavity esophagus rectum bladder vagina uterine cervix ureters Moderate Radiosensitivity. The of time the primary beam is directed towards a particular wall.

Must be used on all patients for all exposures. Bone marrow damagereduction of blood cell production. The least sensitive are nerve cells and muscle fibers.

Urinary bladder esophagus liver thyroid. Radiation sensitivity varies greatly between tissues. These organs cells or structures are Highly susceptible to the harmful effects of radiation.

Even today the amount of radiation delivered to the tumor is limited by the collateral damage to nearby normal. The amount of radiation required to produce these deterministic effects has been derived from studies in experimental cell cultures animal studies as well as human epidemiology studies. Amongst the body cells the most sensitive are spermatogonia and erythroblasts epidermal stem cells gastrointestinal stem cells.

However the abundance of p53 protein does not correlate well with the extent. Which of the following cell types are most sensitive to radiation damage. A lead apron and thyroid collar.

WT 012 for each of 6. Lymphoid organs bone marrow blood testes ovaries intestines. What radiographic exam is the highest radiation dose for a male female.

The sensitivity of tissues to radiation is determined by. Relative sensitivity of different tissues to the in- duction of tumours by radiation would be to 89 compare the induced tumour rates when all the 89 tissues received the same dose at the same time. Which of the following types of tissues is the most sensitive.

Beta correct 4 _____ blocks aerobic metabolism by interfering with cell use of oxygen. Reproductive tissues are known to be more sensitive to IR damage and because women have more reproductive tissues than men do they are susceptible to more harm due to IR.

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