Radiation State Test Exam Latest Update Graded A

RADIATION STATE TEST EXAM LATEST UPDATE GRADED A A X-ray machine after turning off still emits radicactivity due to a process known as the Compton effect. False The disintegration or breaking up of an radiation is called radioactive decay. True Old depleted radiography sources can be treated as ordinary trash and thrown in the garbage False The strength of a source is calied the activity The time required for one-half of the unstable atoms to decay is known as half-life The spread of radioactive materials is called contamination The three basic ways to lower your dose when working with radiography is time distance and shielding Using shielding between yourself and the source will increase your dose False Increasing your distance from a source will increase the amount of radiation you receive. False The more time you stay near a radiography source increases the amount of radiation you receive. True The equation that will tell us the dose rate at any distance from a source if we know the dose rate at an other distance is Dose = Dose Rate x Time Intensity 1 is the unknown intensity and intensity 2 is the known intensity. False How often should sealed sources be leak tested? every six months How often must a physical inventory to account for all sealed sources be performed? daily How often must equipment maintenance be performed on the radiographic equipment? d. daily How often must your survey meter be calibrated? every three months How often must your dosimeter be read? daily How often must your dosimeter be recorded? daily What is the range that a dosimeter must read in order to be used? 0mR/hr to 200 mR/hr At what setting is a rate alarm to be set at when performing industrial radiography? 500 mR/hr A source that emits 05 mR/hr and nothing at 3 would require what type of label? White I A source emitting 35 mR/hr at 3 feet would have what transportation index? 35 Cameras that hold 100 Ci of Ir-192 must be which kind of shipping container? Type B Radiographic sources are which of the folowing packing? special form The dose a radiographer can receive in 1 year is? 5R Who is responsible for the daily check of the equipment before work starts? the radiographer List three basic means for controlling radiation exposures? time distance shielding The intensity of a source is equal to? emmisivity * curies Which of the following best describe the term half-value layer? the amount of material it takes to reduce the original intensity of a source to 1/2 Ionizing radiation is any radiation that creates: Charged Particles Louisiana is an Agreement State with the NRC and has signed an agreement to enforce the NRC guidelines for safe handling of radioisotopes. True _______ Is discrete particles of radioactive material spread on surfaces where it is not supposed to be. Contamination A sealed source must be "leak tested" every: Six months is a disintegration rate of a quantity of radioactive material. Curie What is the half life of cobalt 60? 5.3 Years What is the half-life of Iridium 192? 75 Days What is the half life of Cesium 137? 30 Years A measurement of rems Roentgen equivalert in man The maximum yearly allowable occupational dose rate is? 5 rems The equation that will tell us the dose rate at any distance from a source if we know the dose rate at some other distance is called the Inverse square law A restricted area is any area where an individual could receive an occupational expesure to the whole body in excess of 2 mr in any one hour. True The formula used to determine the intensity of radiation at a given source is called the: Inverse Square Law What is the best way to protect an area and people from escessive radiation exposure? Constant Surveillance The maximum annual permissible accumulated personnel dose allowed by law is: 5R An advantage of the pocket dosimeter used to monitor radiation received by personnel is: It provides an immediate indication of dosage Which material gives the greatest degree of shielding from radioactivity? inches of lead What Department of the Federal Government sets laws controlling use, possession, transfer and all activities involving radioactive isotopes? NRC Radiation is a form of. energy A neutron passing through matter may strike the nucleus of an atom and cause reactions which will lonize The fundamental building blocks of atoms include: protons, neutrons, electrons Three types of ionizing radiation are: Beta particles. Gamma rays. Alpha particles Most all shielding material used for exposure devices is made of. depleted uranium For Industrial X-rays, which is the most penetrating form radiation? Gamma rays One of the effects of Gamma rays is it's ability to cause: lonization The unit of measurement of radioactivity is referred to as. curies One curie is that quantity of radioactive material that decays at the rate of 3.7 x 10 DPS Elements are classified in the Chart of Elements by the number of Protons in an atom Includes The only difference between Gamma rays and X-rays is their: Origin One curie of cobalt 60 & one curie of Ir-192: will have the same number of disintegrations per second The time required for 1/2 of the atoms of any radioactive material to go thru the disintegration process is referred to as the: half life Gamma rays will penetrate deeper in mater than Alpha or Beta particies because: gamma rays have no electric charge and thus do not interact with matter as strongly as do charged particles. Any area access which is controlled by the licensee for purposes of protection of individuals from exposure to radiation and radioactive material is the same as: restricted area Gamma rays can also be referred to as: electromagnetic radiation The two most commonly used isotopes for radiography are: Ir-192 and Co-60 The half-life of cobalt 60 is a little over 5 years. After 3 half-lives, a 6 Ci Co-60 source will have how many curies? 7.5 curies Radiation energy is usually expressed in terms of: EV. KEV or MEV Hertz When an electron is knocked out of it's orbit from an atom by a gamma ray: an ion is created The operating range of a pocket dosimeter required for industrial radiographers, according to Texas Regulations, is: 0 to 200 mR/hr Survey meters must be calibrated and acceptable tags or labels attached, every: every three months The film badge or TLD badge primarily provides: exposure a permanent record of whole body Film badges should be worn: between the neck and the waist Radiation survey instruments must be able to measure radiation levels from: 2 mR/hr to 1 R/hr Most survey meters used to detect radiation in Industrial Radiography operations use a: scintillation detector A radiographer, during radiography operations, must have the following items: film badge, dosimeter, survey meter If and individual's pocket dosimeter is discharged beyond it's range. the individual: a shall cease operations and have film badge processed immediately and not return to work until a determination has been made The pocket dosimeter gives the radiographer the advantage of. providing immediate indication of radiation dose Radiation received in a short period of time is referred to as: acute radiation exposure Earliest detection of radiation damage may be detected in the: blood cells The effects of radiation on the reproductive cells and passed on to the descendants, is called: genetic effects The area that has a boundary posted "Caution- High Radiation Area" will mean a person could receive a radiation dose of: 100 mrems per hour "Source assembly" refers to the same thing as a: pigtail A person must be of what age to be allowed to handie radioactive material? 18 years of age The thickness of a material which will reduce the amount of radiation passing through the material to one-half it's initial intensity is called the half value layer Using Co-60, at a certain distance, the radiation intensity is 600 mR/hr. The thickness of lead needed to reduce the radiation levels to 75 mR/hr is: 1.5 If the radiation intensity at a certain point is 50 R/hr, how many half-value layers are required to reduce the levels to 5 R/hr? 4 If you receive 8 mR/hr in 2 minutes at a certain distance from the what will be your dose rate for 1 hour? 240 mR/hr An individual under 18 years of age may not receive in any one calendar quarter, from all sources of radiation, in possession of the licensee or registrant, a dose in excess of 10 percent The formula for finding the permissible accumulated dose for an individual iS: 5 (N-18) The allowable for whole body radiation dose limit in restricted areas is: 5 rems a year The thickness of a material which will reduce the amount of radiation to nine-tenths of it's initial intensity is called tenth value layer What will the radiation dose rate be for a 100 Ci Ir-192 source 25 feet from the source using a tungsten collimator with a HVL of 4? Total time of exposure is 30 minutes. (R factor is 5.9) 30 mR/hr Three basic ways to lower radiation dose when working with radiography sources are: time, distance and shielding layers, t A state receiving authority from the NRC to regulate activities or use of radioactive materials and equipment is called an agreement state When does a leak test need to be done Every six months The term used to let a company, with a radioactive material license in one state, work in another state is called: Reciprocity The shipping container for radiography sources must meet certain standards. The type used primarily for shipping sources is classified as Туре В How much radiation will a person receive standing 100 feet from a source with a dose rate of 20 mR/hr where 4 exposures were made lasting 3 minutes each? 4 mR/hr If you were using a 100 Ci Ir-192 source, what will the dose rate be at a distance of 100 feet from the source? (R=5.2) R/hr 052 mR/hr Repeat problem 50 except calculate the dose rate at 200' instead of 100. 12.5 mR/hr Radiography companies doing work in a Non-agreement State are regulated by the: NRC