In terms of classification of staff and designated areas, which of the

1.	In terms of classification of staff and designated areas, which of the following are true? a. If an employee works in a supervised area, his external dose rate could be between 2.5 and 7.5 μSv h-1 averaged over the working day b. If an employee works in a controlled area it means that the dose to the lens of his eyes could be more than 45 mSv c. In a supervised area, it is likely that any person could exceed the dose limit for a member of the public d. Of the staff in the radiology department, 99% do not exceed the dose limit of a member of the public in any year e. If the finger monitoring of a radiologist showed that he received 150 mSv over the period of a month, it means he needs monthly dose monitoring and an annual health check
Answer» a. True. In a supervised area, the dose rate is between 2.5 and 7.5 μSv h^-1 averaged over the working day, while in a controlled area the dose rate could exceed 7.5 μSv h^-1 . b. True. The dose limit for the lens of the eyes is 150 mSv and a person working in a controlled area is likely to receive a radiation dose greater than three-tenths of any dose limit. c. True. d. True. Less than 1% of the staff in the radiology department whose dose is monitored receive more than 1 mSv in any year (dose limit for a member of the public). e. True. A finger dose of more than 150 mSv per year means that the person should be classified. The monitoring period for classified workers is 1 month and they must have an annual health check and the records of these should be kept for 50 years.

In terms of classification of staff and designated areas, which of the following are true? a. If an employee works in a supervised area, his external dose rate could be between 2.5 and 7.5 μSv h-1 averaged over the working day b. If an employee works in a controlled area it means that the dose to the lens of his eyes could be more than 45 mSv c. In a supervised area, it is likely that any person could exceed the dose limit for a member of the public d. Of the staff in the radiology department, 99% do not exceed the dose limit of a member of the public in any year e. If the finger monitoring of a radiologist showed that he received 150 mSv over the period of a month, it means he needs monthly dose monitoring and an annual health check

Answer»

a. True. In a supervised area, the dose rate is between 2.5 and 7.5 μSv h^-1 averaged over the working day, while in a controlled area the dose rate could exceed 7.5 μSv h^-1 .

b. True. The dose limit for the lens of the eyes is 150 mSv and a person working in a controlled area is likely to receive a radiation dose greater than three-tenths of any dose limit.

c. True.

d. True. Less than 1% of the staff in the radiology department whose dose is monitored receive more than 1 mSv in any year (dose limit for a member of the public).

e. True. A finger dose of more than 150 mSv per year means that the person should be classified. The monitoring period for classified workers is 1 month and they must have an annual health check and the records of these should be kept for 50 years.

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