# Shared Flashcard Set

## Details

Dose-Response Relationships
The relationship between the dose received and the response seen
12
Physics
11/08/2008

## Additional Physics Flashcards

Term
 Name the 3 types of dose-response relationships.
Definition
 1. Sigmoid (AKA nonlinear)2. Direct-Linear3. Linear Quadratic
Term
 For which type of dose-response relationship is there a threshold dose?
Definition
 Sigmoid (AKA nonlinear)
Term
 All nonstochastic effects have which type of dose-response relationship?
Definition
 Sigmoid (AKA nonlinear)
Term
 Erythema and cataracts have which type of dose-response relationship?
Definition
 Sigmoid (AKA nonlinear)
Term
 Why do all 3 types of dose-response relationship graphs for any type of effect start slightly above zero?
Definition
 Because the endemic (naturally-occuring) level is the starting point - in other words, in a given group even with no dose (0 on dose axis), there will still be people with that effect who are part of the naturally-occurring percentage.
Term
 Of the 3 types of DRR, which is the worst type and why?
Definition
 Direct-Linear relationship, because there is no safe threshold - any radiation at all increases the chance of the effect and it is linear - as the dose goes up, the chance goes up directly (it goes up less steeply with Linear-Quadratic)
Term
 Of the three types of DRR, which is the best type and why?
Definition
 Sigmoid (or nonlinear), because there is a safe threshold - at low levels, the effect doesn't show up. The other two have no safe threshold, although L-Q is a little safer than L-D.
Term
 What shape does the sigmoid DRR graph have?
Definition
 An "S" - stays at 0 for low doses (the bottom of the "S", then slants up after the threshold is reached until it hits the dose where 100% show the effect, then goes horizontal again (the top of the "S)
Term
 Stochastic effects all have *** or *** DRRs?
Definition
Term
 The effect of genetic mutations in reproductive cells has what type of DRR?
Definition
 Linear-Direct
Term
 When an effect has a Linear-Quadratic DRR, at low doses the effect has a/an *** relationship with dose, while at high doses, it has a/an *** relationship with dose. (linear/exponential)
Definition
 At low doses, linear.At high doses, exponential.
Term
 Most (but not all) radiation-induced cancers have which type of DRR?
Definition