NRRPT PREP COMPLETE STUDY GUIDE EXAM LATEST
2026/2027 UPDATED VERIFIED QUESTIONS AND SOLUTIONS
A+ PASS GUARANTEED|COMPLETE STUDY GUIDE WITH
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Question number: 1
Fundamentals of radiation protection
A low energy alpha detector is usually effective if the detector is distant from the source.
A) 1/4 inch
B) 1/2 inch
C) 1 inch
D) 1 1/2 inches
E) 2 inches answer: the correct answer is: a
Low energy alpha particles can only travel less than 1/2 inch in air. Therefore, one must be
closer than this to detect them.
Question number: 2
Fundamentals of radiation protection
A sample of i-131 (half life = 8 days) is kept for 80 days, at which time the activity is 1 µci .
What was the original activity?
A) 2.0 mci
1
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,B) 1.0 mci
C) 1.5 mci
D) 3.5 mci
E) 4.0 mci answer: the correct answer is: b
After 10 half lives, the remaining activity is approximately 1000th of the original amount.
Therefore, if there was 1µci left after 10 half lives, then there must have been 1000 times more to
start with. Hence, 1 µci * 1000 = 1 mci.
Question number: 3
Fundamentals of radiation protection
A sample of radioactive material is reported to contain 2000 picocuries of activity. Express this
value as disintegrations per minute.
A) 370 dpm
B) 900 dpm
C) 3770 dpm
D) 4440 dpm
E) 5320 dpm answer: the correct answer is: d
Dps = (2000 pci)(1 x 10-12ci/pi )(3.7x1010 dps/ci) dps = 74
Dpm = (74 dps) (60 sec/min)
Dpm = 4440
Remember to convert to disintegrations per minute not disintegrations per second.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
,Question number: 1
Fundamentals of radiation protection
A low energy alpha detector is usually effective if the detector is distant from the source.
A) 1/4 inch
B) 1/2 inch
C) 1 inch
D) 1 1/2 inches
E) 2 inches answer: the correct answer is: a
Low energy alpha particles can only travel less than 1/2 inch in air. Therefore, one must be
closer than this to detect them.
Question number: 2
Fundamentals of radiation protection
A sample of i-131 (half life = 8 days) is kept for 80 days, at which time the activity is 1 µci .
What was the original activity?
A) 2.0 mci
B) 1.0 mci
C) 1.5 mci
D) 3.5 mci
E) 4.0 mci answer: the correct answer is: b
3
APPHIA - Crafted with Care and Precision for Academic Excellence.
, After 10 half lives, the remaining activity is approximately 1000th of the original amount.
Therefore, if there was 1
µci left after 10 half lives, then there must have been 1000 times more to start with. Hence, 1 µci
* 1000 = 1 mci.
Question number: 3
Fundamentals of radiation protection
A sample of radioactive material is reported to contain 2000 picocuries of activity. Express this
value as
Disintegrations per minute.
A) 370 dpm
B) 900 dpm
C) 3770 dpm
D) 4440 dpm
E) 5320 dpm answer: the correct answer is: d
Dps = (2000 pci)(1 x 10-12ci/pi )(3.7x1010 dps/ci) dps = 74
Dpm = (74 dps) (60 sec/min)
Dpm = 4440
Remember to convert to disintegrations per minute not disintegrations per second.
Question number: 4
Fundamentals of radiation protection
4
APPHIA - Crafted with Care and Precision for Academic Excellence.
2026/2027 UPDATED VERIFIED QUESTIONS AND SOLUTIONS
A+ PASS GUARANTEED|COMPLETE STUDY GUIDE WITH
100% ACCURATE QUESTIONS &ANSWERS. EXCELLENCE
GUARANTEED.
Question number: 1
Fundamentals of radiation protection
A low energy alpha detector is usually effective if the detector is distant from the source.
A) 1/4 inch
B) 1/2 inch
C) 1 inch
D) 1 1/2 inches
E) 2 inches answer: the correct answer is: a
Low energy alpha particles can only travel less than 1/2 inch in air. Therefore, one must be
closer than this to detect them.
Question number: 2
Fundamentals of radiation protection
A sample of i-131 (half life = 8 days) is kept for 80 days, at which time the activity is 1 µci .
What was the original activity?
A) 2.0 mci
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
,B) 1.0 mci
C) 1.5 mci
D) 3.5 mci
E) 4.0 mci answer: the correct answer is: b
After 10 half lives, the remaining activity is approximately 1000th of the original amount.
Therefore, if there was 1µci left after 10 half lives, then there must have been 1000 times more to
start with. Hence, 1 µci * 1000 = 1 mci.
Question number: 3
Fundamentals of radiation protection
A sample of radioactive material is reported to contain 2000 picocuries of activity. Express this
value as disintegrations per minute.
A) 370 dpm
B) 900 dpm
C) 3770 dpm
D) 4440 dpm
E) 5320 dpm answer: the correct answer is: d
Dps = (2000 pci)(1 x 10-12ci/pi )(3.7x1010 dps/ci) dps = 74
Dpm = (74 dps) (60 sec/min)
Dpm = 4440
Remember to convert to disintegrations per minute not disintegrations per second.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
,Question number: 1
Fundamentals of radiation protection
A low energy alpha detector is usually effective if the detector is distant from the source.
A) 1/4 inch
B) 1/2 inch
C) 1 inch
D) 1 1/2 inches
E) 2 inches answer: the correct answer is: a
Low energy alpha particles can only travel less than 1/2 inch in air. Therefore, one must be
closer than this to detect them.
Question number: 2
Fundamentals of radiation protection
A sample of i-131 (half life = 8 days) is kept for 80 days, at which time the activity is 1 µci .
What was the original activity?
A) 2.0 mci
B) 1.0 mci
C) 1.5 mci
D) 3.5 mci
E) 4.0 mci answer: the correct answer is: b
3
APPHIA - Crafted with Care and Precision for Academic Excellence.
, After 10 half lives, the remaining activity is approximately 1000th of the original amount.
Therefore, if there was 1
µci left after 10 half lives, then there must have been 1000 times more to start with. Hence, 1 µci
* 1000 = 1 mci.
Question number: 3
Fundamentals of radiation protection
A sample of radioactive material is reported to contain 2000 picocuries of activity. Express this
value as
Disintegrations per minute.
A) 370 dpm
B) 900 dpm
C) 3770 dpm
D) 4440 dpm
E) 5320 dpm answer: the correct answer is: d
Dps = (2000 pci)(1 x 10-12ci/pi )(3.7x1010 dps/ci) dps = 74
Dpm = (74 dps) (60 sec/min)
Dpm = 4440
Remember to convert to disintegrations per minute not disintegrations per second.
Question number: 4
Fundamentals of radiation protection
4
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