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  • Section 1 Radiation Quantities Answers and Feedback

  • Section 1 Radiation Quantities Answers and Feedback 

    1. ANSWER: A
    FEEDBACK: When x-rays are absorbed in biologic material, the photon first interacts with an orbital electron of an atom of the material by the photo-electric (or Compton) process to produce a fast recoil electron. The energy of this electron is lost through interactions with other atoms or molecules to produce biomolecular ions. The ensuing biochemi­cal events may or may not lead to a biologic effect. Protons and spallation products are formed when neutrons are absorbed in tissue. The correct option is A. Electrons. 

    2. ANSWER: A-FALSE, B-FALSE, C-TRUE, D-FALSE, E-TRUE
    FEEDBACK: Système International (SI) units are the gray and the sievert. The gray is the unit of absorbed dose and is defined as 1J/kg. The sievert is the unit of equivalent dose, or the product of dose in grays and the radiation weighting factor (Wr). The rad, rem, and curie are the old units, replaced in the SI system by the gray, sievert, and becquerel. Options C and E are True 

    3. ANSWER: 1-C, 2-B, 3-D, 4-A
    FEEDBACK: The genetically significant dose is the dose that if given to everyone in the U.S. population would result in the same number of mutations as would the actual variable dose received by part of the population during medical irradiation. It therefore gives some idea of the impact of gonadal radiation C matches with 1. Dose is a physical term, expressed as energy per unit mass. One gray of different types of radiation does not result in the same biologic effect. The equivalent dose is the product of dose and the radiation weighting factor (Wr), a dimensionless factor designed to reduce all radiation to a common scale. The unit is the sievert. One sievert of any kind of radiation produces the same biologic effect B matches with 2. Different organs and tissues show different susceptibilities to the biologic effects of radiation. The effective dose is the sum of the products of equivalent dose and the tissue weighting factor (Wt ) for all organs or tissues exposed D matches with 3. In the case of an incorpo­rated radionuclide, the dose is not delivered instan­taneously but over a period of time depending on the half-life of the radionuclide. Committed equivalent dose takes that into account and is the effective dose integrated over 50 years A matches with 4. 

    4. ANSWER: 1-B, 2-D, 3-A, 4-C
    FEEDBACK: The unit of absorbed dose is the gray, defined as 1J/kg; B matches with 1. The unit of activity of a radionuclide is the becquerel, defined Radiation Biology Syllabus for Diagnostic and Interventional Radiologists 2007 28 as one disintegration per second; D matches with 2. The equivalent dose is the product of absorbed dose in grays and the radiation weighting factor (Wr), which is a dimensionless factor. The unit is the sievert A matches with 3. The collective effective dose is the sum of the effective doses for all members of a population. The unit is the person-sievert C matches with 4.  

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Discounted Dues: Eligible North American Countries 
Belize
Costa Rica
Dominican Republic
El Salvador
Grenada
Guatamala
Haiti
Honduras
Jamaica
Netherlands Antilles
Nicaragua
Panama
St.Lucia
St. Vincent & Grenadines
Country    Country    Country 
Afghanistan   Grenada   Pakistan
Albania   Guatemala   Papua New Guinea
Algeria   Guinea   Paraguay
Angola   Guinea-Bissau   Peru
Armenia   Guyana   Phillippines
Azerbaijan   Haiti   Rwanda
Bangladesh   Honduras   Samoa
Belarus   India   Sao Tome & Principe
Belize   Indonesia   Senegal
Benin   Iran   Serbia
Bhutan   Iraq   Sierra Leone
Bolivia   Jordan   Solomon Islands
Bosnia & Herzegovina   Jamaica   Somalia
Botswana   Kenya   South Africa
Bulgaria   Kiribati   South Sudan
Burkina Faso   Korea, Dem Rep (North)   Sri Lanka
Burundi   Kosovo   St Lucia
Cambodia   Kyrgyzstan   St Vincent & Grenadines
Cameroon   Laos\Lao PDR   Sudan
Cape Verde   Lesotho   Swaziland
Central African Republic   Liberia   Syria
Chad   Macedonia   Tajikistan
China   Madagascar   Tanzania
Colombia   Malawi   Thailand
Comoros   Maldives   Timor-Leste
Congo, Dem. Rep.   Mali   Togo
Congo, Republic of   Marshall Islands   Tonga
Cote d'Ivoire   Mauritania   Tunisia
Djibouti   Micronesia, Fed. Sts.   Turkmenistan
Dominica   Moldova   Tuvalu
Domicican Republic   Mongolia   Uganda
Ecuador   Montenegro   Ukraine
Egypt   Morocco   Uzbekistan
El Salvador   Mozambique   Vanuatu
Eritrea   Myanmar   Vietnam
Ethiopia   Namibia   West Bank & Gaza
Fiji   Nepal   Yemen
Gambia, The   Nicaragua   Zambia
Georgia   Niger   Zimbabwe
Ghana   Nigeria    

Legacy Collection 2
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Tier 1

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