Tuesday, 27 May 2014

MCQ FOR FRCR ./ DNB -------Thermoluminescent dosimeters (TLD)



374.True regarding thermoluminescent  dosimeters (TLD) 
a.used to measure deep and shallow dose
b. energy dependent response
c.overall sensitivity  significantly better than film
d.much less susceptible to environmental effects
e.relatively inexpensive

375.True regarding thermoluminescent  dosimeters (TLD) 
a.no use of filters
b.can be reused for once
c.most common dosimeter used for assessment of finger dose
d.can be read once
e.minimal energy dependence for response


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ANS OF PREVIOUS Q.


365.Principle recommendations in the Medical and Dental Guidance Notes is/are
a.leakage radiation from the tube should be less than 1mGy/hr ata distance of 1m from the focus
b.the total filtration of the tube and tube assembly should be less than the equivalent of 2.5mm of aluminium
c.the operator should stand at least 2 m  from the tube
d.the housing and support plate for the image intensifier should have shielding of at least 2 mm lead equivalence.
e.skin entrance dose rates should not exceed 100 mGy /min

365.abcde---- (Chapter 2,page no.35,second edition (2008),Farr’s Physics for Medical Imaging).

366.True regarding classified persons ---- 
a. are at no risk  from ionization radiations
b.age 18 yrs or below
c.subject to dose monitoring
d.subjects to biennual health checks
e.health check-up records to be kept for 50 yrs beyond the dates the individual stop working as a classified person

366.ce----Staffs designed as classified persons  are at risk  from ionization radiations,are of age of 18 yrs or above and are certified as being medically fit to work as a classified person (by doctor appointed by HSE),are subject to dose monitoring  and subjects to annual health check-up---- (Chapter 2,page no.34,second edition (2008),Farr’s Physics for Medical Imaging).

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